CHANGES.md

# Synapse 1.164.1 (2026-10-28)

## Bugfixes

- Fix clearing user status for clients that send a `null` profile field value.

  When `include_profile_updates_in_sync` is enabled, Synapse will continue to accept `null` custom profile field values
  until clients have had a sufficient time to change their behaviour. This special casing is tracked in [this issue](https://github.com/element-hq/synapse/issues/20424). ([\#20422](https://github.com/element-hq/synapse/issues/20422))

## Internal Changes

- Bump `msgpack` from `1.2.1` to `1.2.4` to address [`GHSA-j586-36cw-2gc2`](https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2gc2) which can cause memory exhaustion problems when malformed tokens are used with the public room list API's. ([\#20421](https://github.com/element-hq/synapse/issues/20421))




# Synapse 1.164.0 (2026-10-27)

No significant changes since 1.164.0rc3.



# Synapse 1.163.2 (2026-10-23)

## Internal Changes

- Bump `pillow` to `13.0.0` to address [critical security vulnerabilties](https://pillow.readthedocs.io/en/stable/releasenotes/13.0.0.html#security). You must use Python >= 3.11 to take advantage of this version bump. ([\#20398](https://github.com/element-hq/synapse/issues/20398))




# Synapse 1.164.0rc3 (2026-10-23)

## Internal Changes

- Bump `pillow` to `13.0.0` to address [critical security vulnerabilties](https://pillow.readthedocs.io/en/stable/releasenotes/13.0.0.html#security). You must use Python >= 3.11 to take advantage of this version bump. ([\#20399](https://github.com/element-hq/synapse/issues/20399))




# Synapse 1.163.1 (2026-10-22)

## Internal Changes

- Update `certifi` to `2026.10.19` to address [GHSA-6q48-6c7w-9gw2](https://github.com/certifi/python-certifi/security/advisories/GHSA-6q48-6c7w-9gw2). This only affects TLS connections made by the Sentry SDK when `sentry` is configured, SAML, and a couple utility scripts; federation and Synapse's other outbound HTTP requests use the system trust store. ([\#20387](https://github.com/element-hq/synapse/issues/20387))
- Bump `rustls-webpki` to `0.103.16` to actively distrust [compromised eMudhra intermediate CA certificates](https://emudhra.we-have-a-problem.com/). ([\#20392](https://github.com/element-hq/synapse/issues/20392))



# Synapse 1.164.0rc2 (2026-10-22)

## Internal Changes

- Update `certifi` to `2026.10.19` to address [GHSA-6q48-6c7w-9gw2](https://github.com/certifi/python-certifi/security/advisories/GHSA-6q48-6c7w-9gw2). This only affects TLS connections made by the Sentry SDK when `sentry` is configured, SAML, and a couple utility scripts; federation and Synapse's other outbound HTTP requests use the system trust store. ([\#20387](https://github.com/element-hq/synapse/issues/20387))
- Bump `rustls-webpki` to `0.103.16` to actively distrust [compromised eMudhra intermediate CA certificates](https://emudhra.we-have-a-problem.com/). ([\#20392](https://github.com/element-hq/synapse/issues/20392))




# Synapse 1.164.0rc1 (2026-10-20)

## Features

- Advertise support for Matrix v1.16. ([\#20333](https://github.com/element-hq/synapse/issues/20333))
- Advertise support for Matrix v1.17. ([\#20334](https://github.com/element-hq/synapse/issues/20334))
- [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Add a dedicated endpoint for scheduling delayed events. ([\#19354](https://github.com/element-hq/synapse/issues/19354))
- Require authentication for the [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) delayed event management endpoints, restrict them to the requesting user's own delayed events, and allow guests to use them. ([\#20257](https://github.com/element-hq/synapse/issues/20257))
- [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Reject requests to schedule a delayed event that the sender could not send at that time, such as in a room they are not joined to, unless the event changes their own membership. ([\#20266](https://github.com/element-hq/synapse/issues/20266))
- Stabilise [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222): support the stable `use_state_after` query parameter and `state_after` response field on `/sync`, as per Matrix v1.16, and remove the `msc4222_enabled` experimental config flag. ([\#20170](https://github.com/element-hq/synapse/issues/20170))
- Add the `m.preview_url` capability (stabilizes support for [MSC4452](https://github.com/matrix-org/matrix-spec-proposals/pull/4452)). ([\#20298](https://github.com/element-hq/synapse/issues/20298))
- Catch up historical [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) to remote homeservers that are newly joining the room. ([\#20337](https://github.com/element-hq/synapse/issues/20337))
- In legacy sync, lazy-load the memberships of the senders of [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354). ([\#20362](https://github.com/element-hq/synapse/issues/20362))

## Bugfixes

- Fix media uploads that exceed a configured `media_upload_limits` limit leaving an orphaned file on disk with no corresponding database entry. ([\#20006](https://github.com/element-hq/synapse/issues/20006))
- Fix the leave event being missing from `state_after` ([MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222)) on incremental `/sync` when the leaving user was the last local user in the room. ([\#20081](https://github.com/element-hq/synapse/issues/20081))
- Reject setting `null` profile field values (following [an optional clause in the specification](https://spec.matrix.org/v1.19/client-server-api/#put_matrixclientv3profileuseridkeyname:~:text=Servers%20MAY%20reject%20null%20values%2E)), in order to avoid clients accidentally harming interoperability. ([\#20153](https://github.com/element-hq/synapse/issues/20153))
- Fix a bug where server-default push rules that are disabled by the server's configuration, and thus not served to clients, could still be modified through the client API instead of returning a 404. ([\#20202](https://github.com/element-hq/synapse/issues/20202))
- Default `request_token_inhibit_3pid_errors` to `true` to prevent `/requestToken` endpoints from revealing whether an email address is associated with an account. Contributed by @Manixhor. ([\#20243](https://github.com/element-hq/synapse/issues/20243))
- Stop queueing events and ephemeral data for application services registered with `url: null` (such as bridges' double-puppeting registrations), which wasted work on every matching event and, when no other application service was registered, made Synapse read through its whole event history. ([\#20273](https://github.com/element-hq/synapse/issues/20273))
- Set up `un_partial_stated_room_stream_sequence` during SQLite -> PostgreSQL DB porting, preventing a PostgreSQL sequence inconsistency error on startup. ([\#20302](https://github.com/element-hq/synapse/issues/20302))
- Fix new state saved with the last local user's leave being missing from `state_after` ([MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222)) on incremental `/sync`. ([\#20314](https://github.com/element-hq/synapse/issues/20314))
- Fix verbose Pydantic validation error messages leaking internal details in client API error responses. ([\#20321](https://github.com/element-hq/synapse/issues/20321))
- Apply the [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) history visibility exemptions on all client-server endpoints. ([\#20295](https://github.com/element-hq/synapse/issues/20295))
- Prevent [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) being sticky when they were redacted in the same persistence batch. ([\#20322](https://github.com/element-hq/synapse/issues/20322))
- Remove the stickiness of [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) when they are redacted after persistence. ([\#20323](https://github.com/element-hq/synapse/issues/20323))
- Fix the expiry of [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) being reported differently to how the server tracks them. ([\#20324](https://github.com/element-hq/synapse/issues/20324))
- Filter out [MSC4426](https://github.com/matrix-org/matrix-spec-proposals/pull/4426) User Status fields for remote user profile lookups which become stale on clients without [MSC4259](https://github.com/matrix-org/matrix-spec-proposals/pull/4259) to get updates about profiles over federation. ([\#20328](https://github.com/element-hq/synapse/issues/20328))
- Stop forwarding non-compliant (grandfathered historical) remote user IDs to clients outside the context of an event, by dropping their incoming presence, typing, read receipt, to-device and signing key updates, and by leaving them out of `/sync` device list changes and newly joined users' presence, as per [the spec](https://spec.matrix.org/v1.19/appendices/#historical-user-ids). ([\#20338](https://github.com/element-hq/synapse/issues/20338))
- Fix a bug introduced in Synapse v1.130.0 where Sliding Sync would consider a displayname or avatar change in a room to mean that room was newly-joined. ([\#20339](https://github.com/element-hq/synapse/issues/20339))

## Improved Documentation

- Document that the `/auth_metadata` endpoints can be handled by workers. ([\#20331](https://github.com/element-hq/synapse/issues/20331))
- Fix `complete` task status typo in `/redact_status` admin API docs. ([\#20379](https://github.com/element-hq/synapse/issues/20379))
- Update `/redact_status` admin API docs to reflect better response example and document the `error` field. ([\#20380](https://github.com/element-hq/synapse/issues/20380))

## Deprecations and Removals

- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): No longer cancel a user's delayed state events due to a more recent state event sent from a different user. ([\#19495](https://github.com/element-hq/synapse/issues/19495))
- Remove support for unstable [MSC2965](https://github.com/matrix-org/matrix-spec-proposals/pull/2965) `.well-known` endpoint. ([\#20143](https://github.com/element-hq/synapse/issues/20143))
- Remove the legacy mention push rules by default, as per [MSC4210](https://github.com/matrix-org/matrix-spec-proposals/pull/4210). The `experimental_features.msc4210_enabled` flag now defaults to `true`. ([\#20220](https://github.com/element-hq/synapse/issues/20220))

## Internal Changes

- Add foundations for a Rust backed database pool and bump minimum supported Rust version to 1.85.0. ([\#19996](https://github.com/element-hq/synapse/issues/19996))
- Stop reading from `event_edges.is_state` to prepare for dropping it. The column has been obsolete since Synapse 1.62.0. ([\#20069](https://github.com/element-hq/synapse/issues/20069))
- Add support for joining [MSC4242](https://github.com/matrix-org/matrix-spec-proposals/pull/4242) rooms over federation. ([\#20194](https://github.com/element-hq/synapse/issues/20194))
- Add a clock to the Rust side of Synapse, and use it in the rendezvous handlers. ([\#20294](https://github.com/element-hq/synapse/issues/20294))
- Add `received_ts` to the in-memory event internal metadata struct. ([\#20312](https://github.com/element-hq/synapse/issues/20312))
- Speed up push rule evaluation by not checking rules for the sender. ([\#20315](https://github.com/element-hq/synapse/issues/20315))
- Require a strictly positive stickiness duration for [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354). ([\#20350](https://github.com/element-hq/synapse/issues/20350))
- Remove unused `lxml` packaging and type-stub dependencies, and update URL-preview tests to check for BeautifulSoup instead. ([\#20356](https://github.com/element-hq/synapse/issues/20356))





# Synapse 1.163.0 (2026-10-14)

## Bugfixes

- Fix Synapse failing to start with Redis enabled when installed using pip (avoid incompatible breaking changes in `txredisapi@1.6.0`). ([\#20354](https://github.com/element-hq/synapse/issues/20354))





# Synapse 1.163.0rc1 (2026-10-06)

## Features

- Advertise support for Matrix v1.14. Contributed by @famedly. ([\#20137](https://github.com/element-hq/synapse/issues/20137))
- Advertise support for Matrix v1.15. ([\#20286](https://github.com/element-hq/synapse/issues/20286))
- Catch up [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) to remote homeservers that have missed them. ([\#20165](https://github.com/element-hq/synapse/issues/20165))
- Add push rules for [MSC4075](https://github.com/matrix-org/matrix-spec-proposals/pull/4075): MatrixRTC invites and notifications. ([\#20227](https://github.com/element-hq/synapse/issues/20227))
- Make the task scheduler concurrency configurable via `task_scheduler.max_concurrent_tasks`, defaulting to 5. ([\#20230](https://github.com/element-hq/synapse/issues/20230))
- Cancel a user's scheduled [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) delayed events when their account is deactivated. ([\#20247](https://github.com/element-hq/synapse/issues/20247))

## Bugfixes

- Fix a bug where read receipts could be permanently skipped and never sent to application services if more than 100 read receipts arrived in a single stream update. ([\#20108](https://github.com/element-hq/synapse/issues/20108))
- Use sharded tokens in [MSC4354: Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) sync and sliding sync, preventing events appearing in multiple sync responses. ([\#20186](https://github.com/element-hq/synapse/issues/20186))
- Tell clients to remove local profile information for users after leaving the last room shared with them. ([\#20203](https://github.com/element-hq/synapse/issues/20203))
- Do not include `og:image` in responses to `/preview_url` when the media was automatically quarantined by hash matching. ([\#20211](https://github.com/element-hq/synapse/issues/20211))
- Requires `require_auth_for_profile_requests` to be enabled to enable `limit_profile_requests_to_users_who_share_rooms`. ([\#20231](https://github.com/element-hq/synapse/issues/20231))
- Prevent [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) being sticky when they were redacted prior to persistence. ([\#20232](https://github.com/element-hq/synapse/issues/20232))
- Send all of a room's [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) down legacy `/sync` when a user joins it. ([\#20233](https://github.com/element-hq/synapse/issues/20233))
- Fix a bug where push badge counts could ignore notifications in one room based on another room's summarised counts. ([\#20237](https://github.com/element-hq/synapse/issues/20237))
- Reject user creation via the Admin API when Synapse is delegating authentication to MAS. ([\#20241](https://github.com/element-hq/synapse/issues/20241))
- Fix spurious `Closing scope ... which is not the currently-active one` errors being logged when writing large responses with tracing enabled. ([\#20246](https://github.com/element-hq/synapse/issues/20246))
- Prevent `trial` tests from hanging when running with Twisted 26.4.0 against Postgres. ([\#20272](https://github.com/element-hq/synapse/issues/20272))
- Fix a bug where sending a `null` or non-object `auth` to an endpoint requiring user-interactive authentication returned a 500 error. Contributed by @ankit373. ([\#20274](https://github.com/element-hq/synapse/issues/20274))
- Fix bug where membership events would not be returned in `/sync` when using lazy-loaded members and using an old token for `since`. ([\#20289](https://github.com/element-hq/synapse/issues/20289))

## Updates to the Docker image

- Add worker support to the endpoint for retrieving a single [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) delayed event. ([\#20262](https://github.com/element-hq/synapse/issues/20262))

## Improved Documentation

- Update ESS support link to point to the new customer portal domain. ([\#19070](https://github.com/element-hq/synapse/issues/19070))
- Clarify the `--exists-ok` help text in `register_new_matrix_user`. ([\#20263](https://github.com/element-hq/synapse/issues/20263))

## Deprecations and Removals

- Remove the ability to send state events that are sticky, as this feature was removed from [MSC4354: Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354). ([\#20256](https://github.com/element-hq/synapse/issues/20256))

## Internal Changes

- Switch to `beautifulsoup4` from `lxml` for URL previews. Contributed by @clokep. ([\#19301](https://github.com/element-hq/synapse/issues/19301))
- Add a `synapse_notifier_wait_for_stream_token_timeouts` metric, counting the times a request gave up waiting for a worker to catch up to a stream token, labelled by the lagging stream. ([\#20095](https://github.com/element-hq/synapse/issues/20095))
- Avoid taking the GIL on Tokio worker threads when completing Rust futures. ([\#20252](https://github.com/element-hq/synapse/issues/20252))
- Bump `cryptography` from `46.0.7` to `50.0.1` to resolve `CVE-2026-69248`, `CVE-2026-69249` and `CVE-2026-69247`, none of which affected Synapse. Also bump `pyOpenSSL` from `26.0.0` to `26.4.0` for compatibility with newer `cryptography` versions. ([\#20253](https://github.com/element-hq/synapse/issues/20253))
- Switch dependabot version upgrades to monthly "big bang" upgrades in a single PR per ecosystem to reduce team maintenance burden. Security update PRs remain individual and active. ([\#20255](https://github.com/element-hq/synapse/issues/20255))
- Add type annotations for `RestServlet.PATTERNS` to prevent misuse. ([\#20258](https://github.com/element-hq/synapse/issues/20258))
- Bump `Twisted` in `poetry.lock` from `25.5.0` to `26.4.0`. ([\#20259](https://github.com/element-hq/synapse/issues/20259))
- Stop taking the GIL on Tokio worker threads when calling into Python from Rust. ([\#20267](https://github.com/element-hq/synapse/issues/20267))
- Keep in-repo Complement go dependencies up to date with dependabot. ([\#20270](https://github.com/element-hq/synapse/issues/20270))
- Ignore suspended users failing to join new room when using the `new_room_user_id` option with the admin API to delete a room. ([\#20283](https://github.com/element-hq/synapse/issues/20283))
- Prune `user_ips` less frequently (less stress on the database). ([\#20285](https://github.com/element-hq/synapse/issues/20285))
- Fix the `sytest` job failing on the Twisted trunk workflow due to missing build backend dependencies. ([\#20293](https://github.com/element-hq/synapse/issues/20293))




# Synapse 1.162.0 (2026-09-29)

No significant changes since 1.162.0rc1.




# Synapse 1.162.0rc1 (2026-09-22)

## Features

- Raise default room version to "12". Contributed by @jason-famedly @famedly. ([\#20130](https://github.com/element-hq/synapse/issues/20130))
- Limit the number of end-to-end encryption one-time keys stored per device to 500 per algorithm, rejecting uploads which would exceed the limit with a `400 Bad Request`. ([\#20162](https://github.com/element-hq/synapse/issues/20162))
- Add support for configuring a `username` for Redis connections, for Redis 6+ ACL authentication. ([\#20187](https://github.com/element-hq/synapse/issues/20187))
- Add a rate limit on the client profile lookup endpoints, configurable via `rc_profile`. ([\#20218](https://github.com/element-hq/synapse/issues/20218))

## Bugfixes

- Fix flawed [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311) partial implementation introduced in Synapse v1.136.0 for invites/knocks: client-side API's like `/sync` use [stripped state events](https://spec.matrix.org/v1.18/client-server-api/#stripped-state) and we now send full PDUs on the federation-side. To allow some time for the ecosystem to adapt and support MSC4311, Synapse will only apply strict validation when receiving invites/knocks after 2027-06-01. ([\#19723](https://github.com/element-hq/synapse/issues/19723))
- Allow the third party rules callback `check_event_allowed()` to work with [MSC4291](https://github.com/matrix-org/matrix-spec-proposals/pull/4291) rooms. Contributed by @famedly. ([\#19768](https://github.com/element-hq/synapse/issues/19768))
- Improve server concurrency by opening local media thumbnails asynchronously. Contributed by @guillemo12. ([\#20100](https://github.com/element-hq/synapse/issues/20100))
- Drop incoming federation device list updates from non-compliant (grandfathered historical) user IDs, so that such user IDs are not forwarded to clients outside the context of an event, as per [the spec](https://spec.matrix.org/v1.14/appendices/#historical-user-ids). ([\#20115](https://github.com/element-hq/synapse/issues/20115))
- Stop treating unset display names and avatar URLs as profile fields with a `null` value. ([\#20145](https://github.com/element-hq/synapse/issues/20145))
- Return `allowed_room_ids` in the client [`GET /_matrix/client/v1/rooms/{roomId}/hierarchy`](https://spec.matrix.org/v1.19/client-server-api/#get_matrixclientv1roomsroomidhierarchy) response, as required since Matrix 1.15. ([\#20154](https://github.com/element-hq/synapse/issues/20154))
- Fix state events being omitted from the [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222) `state_after` sync response when the client's `since` token falls inside an event persistence batch, as could happen on worker deployments. ([\#20171](https://github.com/element-hq/synapse/issues/20171))
- Return the stable `M_UNKNOWN_DEVICE` error code, added in Matrix 1.17, instead of its unstable [MSC4326](https://github.com/matrix-org/matrix-spec-proposals/pull/4326)-prefixed identifier. ([\#20181](https://github.com/element-hq/synapse/issues/20181))
- Fix slow recursive `/relations` requests in large rooms by joining events inside the recursive query. ([\#20182](https://github.com/element-hq/synapse/issues/20182))
- Fix a bug introduced in Synapse 1.135.0 where fetching an unset `displayname` or `avatar_url` via `GET /_matrix/client/v3/profile/{userId}/{field}` returned the field with a `null` value instead of an empty object. ([\#20200](https://github.com/element-hq/synapse/issues/20200))
- Add support for un-soft-failing [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) when room state changes, making federation support more reliable. ([\#20204](https://github.com/element-hq/synapse/issues/20204))

## Improved Documentation

- Document the paths that can be handled on workers with stabilised delegated authentication. ([\#20209](https://github.com/element-hq/synapse/issues/20209))
- Document the endpoint for getting a single delayed event is workerisable. ([\#20210](https://github.com/element-hq/synapse/issues/20210))
- Fix small warnings in documentation building tooling output. ([\#20217](https://github.com/element-hq/synapse/issues/20217))
- Replace the stale minimum `poetry` version in the contributing docs with a pointer to the minimum defined in `pyproject.toml`. ([\#20219](https://github.com/element-hq/synapse/issues/20219))
- Added docs regarding firewall configuration. Contributed by @HarisDotParis. ([\#20225](https://github.com/element-hq/synapse/issues/20225))

## Internal Changes

- Port the logcontext machinery (`LoggingContext`, `ContextResourceUsage` and the current-context storage) to Rust. ([\#19979](https://github.com/element-hq/synapse/issues/19979))
- Refactor the Rust code to have a single place to store per-homeserver state. ([\#20011](https://github.com/element-hq/synapse/issues/20011))
- Add a `synapse_storage_stream_current_position` metric, reporting each stream's current position as each worker process sees it. ([\#20097](https://github.com/element-hq/synapse/issues/20097))
- Add HTTP serving functions for future [MSC4242](https://github.com/matrix-org/matrix-spec-proposals/pull/4242) work. ([\#20133](https://github.com/element-hq/synapse/issues/20133))
- Add a cache for looking up individual pieces of current room state. ([\#20160](https://github.com/element-hq/synapse/issues/20160))
- Run the in-repo Complement test suite in CI, even when the standard Complement suite fails. ([\#20161](https://github.com/element-hq/synapse/issues/20161))
- Refactor the federation transmission code to delineate transaction preparation and completion. ([\#20166](https://github.com/element-hq/synapse/issues/20166))
- Add a cache to state resolution keyed off the conflicted events. ([\#20185](https://github.com/element-hq/synapse/issues/20185))
- Improve the rendering of the set inequality errors produced by `assertEqual` in the tests. ([\#20193](https://github.com/element-hq/synapse/issues/20193))
- Fix `/room_summary` returning stale `join_rules`. Contributed by @famedly. ([\#20205](https://github.com/element-hq/synapse/issues/20205))
- Fix the `Schema Diff` CI check failing to post a comment on pull requests from forks. ([\#20207](https://github.com/element-hq/synapse/issues/20207))
- Move documentation building python dependencies into `pyproject.toml` under a new `docs` dependency group. ([\#20216](https://github.com/element-hq/synapse/issues/20216))
- Align comments in `.dockerignore` with what we have in the private Synapse Pro branch. ([\#20224](https://github.com/element-hq/synapse/issues/20224))




# Synapse 1.161.0 (2026-09-15)

No significant changes since 1.161.0rc1.




# Synapse 1.161.0rc1 (2026-09-08)

Please check the [relevant section in the upgrade
notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11610)
as this release deprecates `matrix_rtc.livekit_service_url`.

## Features

- Don't validate signatures with unknown algorithms for master keys, and allow updates to signatures. ([\#19915](https://github.com/element-hq/synapse/issues/19915))
- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Add an endpoint for getting a single delayed event. ([\#19926](https://github.com/element-hq/synapse/issues/19926))
- Add experimental support for letting application services proxy namespaces in the C-S and S-S API as per MSC4512. ([\#19972](https://github.com/element-hq/synapse/issues/19972))
- Add experimental support for sending federation requests from application services as per MSC4512. ([\#19977](https://github.com/element-hq/synapse/issues/19977))
- Add a config option that limits the time period in which local users can redact their own messages. Contributed by @defaultdino. ([\#20138](https://github.com/element-hq/synapse/issues/20138))

## Bugfixes

- Apply the `rc_reports` rate limit to the [room reporting endpoint](https://spec.matrix.org/v1.19/client-server-api/#post_matrixclientv3roomsroomidreport), which the spec declares as rate-limited. ([\#20036](https://github.com/element-hq/synapse/issues/20036))
- Fix `m.call.invite` state events not being given the proper power level on rooms created with the `public_chat` preset. Contributed by @famedly @itsoyou. ([\#20050](https://github.com/element-hq/synapse/issues/20050))
- Return the `M_INVALID_PARAM` error code specified by Matrix v1.13 ([MSC4178](https://github.com/matrix-org/matrix-spec-proposals/pull/4178)) when a malformed email address or country code is submitted to `/account/3pid/{email,msisdn}/requestToken`, and report an unsupported medium ahead of the denied/in-use checks on the msisdn variant. ([\#20101](https://github.com/element-hq/synapse/issues/20101))
- Fix a regression where `client_secret` request parameters were not validated against the character set required by the spec on Pydantic-validated endpoints, regressed in Synapse 1.66.0 (originally fixed for https://github.com/matrix-org/synapse/issues/6766). ([\#20104](https://github.com/element-hq/synapse/issues/20104))
- Do not send a duplicate `m.room.encryption` event on room creation when the client already supplies one in the initial state and `encryption_enabled_by_default_for_room_type` is enabled. Contributed by @FrenchGithubUser @Famedly. ([\#20106](https://github.com/element-hq/synapse/issues/20106))
- Fix a long-standing bug where private read receipts of users outside an application service's namespaces were sent to application services that opted in to receiving ephemeral events ([MSC2409](https://github.com/matrix-org/matrix-spec-proposals/pull/2409)). ([\#20114](https://github.com/element-hq/synapse/issues/20114))
- Fix a bug where the `event_search` background reindex skipped all `m.room.topic` events, making room topics unsearchable after a search index rebuild. ([\#20119](https://github.com/element-hq/synapse/issues/20119))
- Fixed joining rooms with unrecognized restricted join rules being rejected outright instead of returning the proper `M_UNABLE_TO_AUTHORISE_JOIN` error code. Contributed by @tulir @ Beeper. ([\#20132](https://github.com/element-hq/synapse/issues/20132))
- Fix a bug where, until Synapse was restarted, new events in a room would fail to be persisted if the database went down while an event was being persisted in the room. Bug introduced in v1.124.0. ([\#20148](https://github.com/element-hq/synapse/issues/20148))
- Fix the `/profile` endpoint, when querying custom fields, returning a 500 error instead of 404 when the profile does not exist at all. ([\#20149](https://github.com/element-hq/synapse/issues/20149))
- When not using [MSC3866](https://github.com/matrix-org/matrix-spec-proposals/pull/3866), omit the approval flag from the response of `GET /_synapse/admin/v2/users`. ([\#20152](https://github.com/element-hq/synapse/issues/20152))
- Fix `/sync` returning membership events from after the user's leave in `state_after` for left rooms when lazy-loading room members (experimental [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222) implementation). ([\#20169](https://github.com/element-hq/synapse/issues/20169))
- Fix a bug where a server admin setting a custom profile field for a user with no profile received a 500 error; this now succeeds for existing (e.g. deactivated) users and returns a 404 error if the user does not exist. ([\#20172](https://github.com/element-hq/synapse/issues/20172))
- Fix `PUT`/`DELETE` on a profile field returning HTTP 400 instead of 403 (with errcode `M_FORBIDDEN`) when profile changes are disabled via `enable_set_displayname` or `enable_set_avatar_url`. ([\#20173](https://github.com/element-hq/synapse/issues/20173))
- Return the stable `M_APPSERVICE_LOGIN_UNSUPPORTED` error code, added in Matrix 1.17, instead of its unstable MSC4190-prefixed identifier. ([\#20180](https://github.com/element-hq/synapse/issues/20180))
- Fix missing validation of `membership` when making `make_*` requests over federation. Contributed by @tulir @ Beeper. ([\#20189](https://github.com/element-hq/synapse/issues/20189))

## Improved Documentation

- Make `federation_domain_whitelist` nullable in config schema. ([\#20140](https://github.com/element-hq/synapse/issues/20140))

## Deprecations and Removals

- Deprecate `livekit_service_url` and add support for specifying the SFU WebSocket URL for configured LiveKit transports. Please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11610). ([\#20146](https://github.com/element-hq/synapse/issues/20146))
- Drop `GET /_matrix/client/unstable/org.matrix.msc2965/auth_issuer` endpoint which never ended up being used. ([\#20163](https://github.com/element-hq/synapse/issues/20163))
- Remove support for the unstable `org.matrix.msc3202.device_id` query parameter for application service device masquerading. ([\#20192](https://github.com/element-hq/synapse/issues/20192))

## Internal Changes

- Add federation client support for experimental [MSC4242](https://github.com/matrix-org/matrix-spec-proposals/pull/4242): State DAGs. ([\#20127](https://github.com/element-hq/synapse/issues/20127))
- Add storage functions for future [MSC4242](https://github.com/matrix-org/matrix-spec-proposals/pull/4242): State DAG work. ([\#19718](https://github.com/element-hq/synapse/issues/19718))
- Put the `redacts` key under `content` when generating [MSC3912](https://github.com/matrix-org/matrix-spec-proposals/pull/3912) (relation based redactions) for room versions greater than 10. Contributed by @famedly. ([\#19782](https://github.com/element-hq/synapse/issues/19782))
- Declare types that already appear in the module API's public signatures (such as `Requester`, `SynapseRequest` and `UserInfo`) in `synapse.module_api.__all__`. ([\#20107](https://github.com/element-hq/synapse/issues/20107))
- Add missing tests for `parse_stripped_state_event`. Contributed by @guillemo12. ([\#20136](https://github.com/element-hq/synapse/issues/20136))
- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Update the error response for requesting to schedule a delayed event with a delay that exceeds the server-enforced maximum delay. ([\#20156](https://github.com/element-hq/synapse/issues/20156))




# Synapse 1.160.0 (2026-09-02)

No significant changes since 1.160.0rc2.




# Synapse 1.160.0rc2 (2026-08-31)

## Bugfixes

- Fix sending custom profile field removals to legacy sync clients when the field is deleted using the profile field delete endpoint. ([\#20147](https://github.com/element-hq/synapse/issues/20147))



# Synapse 1.160.0rc1 (2026-08-25)

## Features

- Add experimental support for [MSC4502](https://github.com/matrix-org/matrix-spec-proposals/pull/4502): Targeted and unrestricted room member queries. ([\#19974](https://github.com/element-hq/synapse/issues/19974))
- Add optional support for [MSC4262: Profile Updates for Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4262).
  Currently defaults to disabled, and is limited to local users only for the sync results. ([\#20003](https://github.com/element-hq/synapse/issues/20003))
- Allow specifying multiple `action_name` and `status` query parameters when listing scheduled tasks via the admin API. ([\#20067](https://github.com/element-hq/synapse/issues/20067))

## Bugfixes

- Fix a bug where stream positions (presence, to-device message, etc.) could stop being sent to clients if a request was cancelled while a write was allocating a stream ID. Contributed by @FrenchGithubUser @Famedly. ([\#20090](https://github.com/element-hq/synapse/issues/20090))
- Thumbnail WebP images that use transparency as PNG rather than JPEG, to preserve transparency during thumbnailing. Contributed by @catfromplan9. ([\#20094](https://github.com/element-hq/synapse/issues/20094))
- Fix sync stream not being woken up when a user updates a profile field without belonging to any rooms. ([\#20135](https://github.com/element-hq/synapse/issues/20135))

## Improved Documentation

- Document lighttpd reverse proxy configuration example. Contributed by JaxLUG from the Jacksonville Linux Users Group Inc.. ([\#19875](https://github.com/element-hq/synapse/issues/19875))
- Fix the documentation on the `federation_domain_whitelist` config option. ([\#20089](https://github.com/element-hq/synapse/issues/20089))

## Internal Changes

- Update release script to check more often for actions being completed so you don't have to wait around as much. ([\#20093](https://github.com/element-hq/synapse/issues/20093))
- Speed up the conversion of device list changes into outbound federation pokes, and add a metric for how far behind the conversion is. ([\#20098](https://github.com/element-hq/synapse/issues/20098))
- Fix the schema diff CI not using `faketime` for SQLite. ([\#20099](https://github.com/element-hq/synapse/issues/20099))
- Fix the schema diff CI breaking when the Rust module was changed. ([\#20117](https://github.com/element-hq/synapse/issues/20117), [\#20129](https://github.com/element-hq/synapse/issues/20129))
- Reduce database CPU usage when marking device list changes as sent over federation. ([\#20120](https://github.com/element-hq/synapse/issues/20120))
- Fix cache `__len__` of Sliding Sync `PerConnectionState` ignoring account data entries. ([\#20124](https://github.com/element-hq/synapse/issues/20124))
- Update Synapse repo link in inconsistent stream error. ([\#20128](https://github.com/element-hq/synapse/issues/20128))
- Update rustls-webpki to address [GHSA-82j2-j2ch-gfr8](https://github.com/advisories/GHSA-82j2-j2ch-gfr8). ([\#20131](https://github.com/element-hq/synapse/issues/20131))
- Update pyo3 to address [GHSA-36hh-v3qg-5jq4](https://github.com/advisories/GHSA-36hh-v3qg-5jq4) and [GHSA-chgr-c6px-7xpp](https://github.com/advisories/GHSA-chgr-c6px-7xpp). ([\#20131](https://github.com/element-hq/synapse/issues/20131))




# Synapse 1.159.0 (2026-08-18)

No significant changes since 1.159.0rc1.


# Synapse 1.159.0rc1 (2026-08-11)

Administrators using the Debian/Ubuntu packages from `packages.matrix.org`, please check
[the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/release-v1.159/docs/upgrade.md#upgrading-to-v11590)
as we have recently updated the expiry date on the repository's GPG signing key. The old version of the key will expire on `2027-03-15`.

## Features

- Add optional support for [MSC4429: Profile Updates for Legacy Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4429).
  Currently defaults to not enabled, and is limited to local users only for the sync results. ([\#19556](https://github.com/element-hq/synapse/issues/19556))

## Bugfixes

- Fix thumbnail generation failing for MPO images. Animations that cannot be decoded now fall back to a static thumbnail. ([\#20025](https://github.com/element-hq/synapse/issues/20025))
- Fix the `quarantined_media` replication stream never being sent when the configured `quarantined_media_changes` stream writer is a worker. Introduced in v1.152.0. ([\#20085](https://github.com/element-hq/synapse/issues/20085))

## Updates to the Docker image

- Run with `PYTHONUNBUFFERED=1` to ensure that we can always see log output when things go wrong. ([\#20075](https://github.com/element-hq/synapse/issues/20075))

## Improved Documentation

- Correct the documentation for the `on_media_upload_limit_exceeded` module callback with regards to where it is called from. ([\#20018](https://github.com/element-hq/synapse/issues/20018))
- Add upgrade notes to point out updated Debian package signing key. ([\#20066](https://github.com/element-hq/synapse/issues/20066))
- Update stream cheatsheet docs to re-link `synapse/config/workers.py` which has more references. ([\#20086](https://github.com/element-hq/synapse/issues/20086))

## Internal Changes

- Fix tests that use `homeserver_to_use=GenericWorkerServer` not being able to be run standalone. ([\#20017](https://github.com/element-hq/synapse/issues/20017))
- Fix `RemoteJoinHelper` test helper to handle room version "12" rooms. Contributed by @famedly @jason-famedly. ([\#20021](https://github.com/element-hq/synapse/issues/20021))
- Fix release script announcement to link to correct release branch of changelog. ([\#20023](https://github.com/element-hq/synapse/issues/20023))
- Dust off `make_full_schema` and add CI using it to show schema diffs. ([\#20027](https://github.com/element-hq/synapse/issues/20027))
- Remove broken `DROP` statements for SQLite in `make_full_schema` script. ([\#20028](https://github.com/element-hq/synapse/issues/20028))
- Document how to capture a JSON snapshot of a Grafana dashboard to aid in debugging. ([\#20048](https://github.com/element-hq/synapse/issues/20048))
- Routinely purge old cancelled tasks from the database. ([\#20068](https://github.com/element-hq/synapse/issues/20068))
- Introduce an `RdataSafeValue` type and correct some minor type annotation mistakes. ([\#20071](https://github.com/element-hq/synapse/issues/20071))
- Set `idle_in_transaction_session_timeout` (default 30 minutes) on new PostgreSQL connections, so that wedged connections don't hold locks or block vacuum indefinitely. ([\#20077](https://github.com/element-hq/synapse/issues/20077))




# Synapse 1.158.0 (2026-08-04)

## Deprecations and Removals

- Remove package build targets for Ubuntu 25.10 'Questing Quokka' (end-of-life 2026-07-01). ([\#20039](https://github.com/element-hq/synapse/issues/20039))

## Internal Changes

- Add package build targets for Ubuntu 26.04 'Resolute Raccoon'. ([\#20039](https://github.com/element-hq/synapse/issues/20039))




# Synapse 1.158.0rc1 (2026-07-30)

## Features

- Change default room version to 11, implementing [MSC4239](https://github.com/matrix-org/matrix-spec-proposals/pull/4239) as part of Matrix v1.14. ([\#18680](https://github.com/element-hq/synapse/issues/18680))
- Add animation support to the media thumbnailer, gated behind the `animated` query parameter on the thumbnail endpoint (defaults to off). ([\#18831](https://github.com/element-hq/synapse/issues/18831))
- Return `M_USER_LIMIT_EXCEEDED` error code for media upload limits from [MSC4335](https://github.com/matrix-org/matrix-spec-proposals/pull/4335). ([\#18876](https://github.com/element-hq/synapse/issues/18876))
- Add Synapse Module API hook that notifies modules when events are delivered over federation (`register_federation_callbacks(...)`). ([\#20019](https://github.com/element-hq/synapse/issues/20019))

## Bugfixes

- Fix third-party (3pid) invites over federation failing intermittently in version 12 rooms, whose room IDs no longer encode a server name. ([#19898](https://github.com/element-hq/synapse/issues/19898))
- Fix `/createRoom` intermittently failing with a 500 error in version 12 rooms when the same user creates several rooms at once, due to colliding room IDs. ([\#19898](https://github.com/element-hq/synapse/issues/19898))
- Fix server key cache invalidations being silently dropped on workers. ([\#19966](https://github.com/element-hq/synapse/issues/19966))
- Fix `HomeServer.shutdown()` not being able to cleanly shutdown the homeserver (caused by Rust code referencing Python `DatabasePool`). ([\#20009](https://github.com/element-hq/synapse/issues/20009))

## Improved Documentation

- Clarify the usage of the `guests` parameter when using the [List Accounts (V2) admin API](https://element-hq.github.io/synapse/develop/admin_api/user_admin_api.html#list-accounts-v2) with the Matrix Authentication Service integration enabled. ([\#19963](https://github.com/element-hq/synapse/issues/19963))

## Internal Changes

- Update release script JSON schema find/replace task to be compatible with macOS. ([\#19962](https://github.com/element-hq/synapse/issues/19962))
- Remove alert silencing deploy step from release script instructions as it's no longer necessary. ([\#19968](https://github.com/element-hq/synapse/issues/19968))
- Link to changelog instead of duplicating content in the tag/release. ([\#19984](https://github.com/element-hq/synapse/issues/19984))
- Fix `RemoteJoinHelper` test helper signing events with the default room version (room version mismatch). ([\#20015](https://github.com/element-hq/synapse/issues/20015))
- Fix `assertIncludes` printing `None` at the end of the message. ([\#20020](https://github.com/element-hq/synapse/issues/20020))




# Synapse 1.157.2 (2026-07-28)

This security release addresses several vulnerabilities.

Please upgrade when you can, particularly if your homeserver participates in open federation
and/or has untrusted local users.

## Security Fixes

High severity:

- Fix [ELEMENTSEC-2026-1071](https://github.com/element-hq/synapse/security/advisories/GHSA-fp53-rw9v-hcf9)
- Fix [ELEMENTSEC-2024-1520](https://github.com/element-hq/synapse/security/advisories/GHSA-rgv2-84w7-5j9p)
- Fix [ELEMENTSEC-2026-1717](https://github.com/element-hq/synapse/security/advisories/GHSA-27p5-4f45-gx76)
- Fix [ELEMENTSEC-2026-1721](https://github.com/element-hq/synapse/security/advisories/GHSA-95fh-hv8c-chvq)
- Fix [ELEMENTSEC-2026-1729](https://github.com/element-hq/synapse/security/advisories/GHSA-cjh7-rcpx-xpf8)
- Fix [ELEMENTSEC-2026-1740](https://github.com/element-hq/synapse/security/advisories/GHSA-6wjm-9p2x-gvpm)

Moderate severity:

- Fix [ELEMENTSEC-2026-1714](https://github.com/element-hq/synapse/security/advisories/GHSA-qcjr-46gf-7f4r)
- Fix [ELEMENTSEC-2026-1718](https://github.com/element-hq/synapse/security/advisories/GHSA-r66v-qhwx-8rg4)
- Fix [ELEMENTSEC-2026-1751](https://github.com/element-hq/synapse/security/advisories/GHSA-jhcg-5392-5mjw)

Low severity:

- Fix [ELEMENTSEC-2026-1703](https://github.com/element-hq/synapse/security/advisories/GHSA-vh4c-pqh4-w3wq)
- Fix [ELEMENTSEC-2026-1760](https://github.com/element-hq/synapse/security/advisories/GHSA-hgcg-p9gx-fq5f)


# Synapse 1.157.1 (2026-07-22)

## Bugfixes

- Fix config regression around falsy `experimental_features` no longer being accepted. ([\#19987](https://github.com/element-hq/synapse/issues/19987))


# Synapse 1.157.0 (2026-07-21)

No significant changes since 1.157.0rc1.

Please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11570) as this release removes support for the deprecated MSC3861 Auth Delegation (`experimental_features.msc3861`).


# Synapse 1.157.0rc1 (2026-07-14)

## Features

- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Limit how many delayed events a user may have scheduled at once. ([\#19539](https://github.com/element-hq/synapse/issues/19539))
- Support [MSC4446](https://github.com/matrix-org/matrix-spec-proposals/pull/4446) for moving fully read markers backwards. Contributed by @SpiritCroc @ Beeper. ([\#19663](https://github.com/element-hq/synapse/issues/19663))
- Add before and after time filters to the ['Redact events of a user'](https://element-hq.github.io/synapse/v1.157/admin_api/user_admin_api.html#redact-events-of-a-user) Admin API. ([\#19802](https://github.com/element-hq/synapse/issues/19802))
- Updated experimental support for [MSC4388: Secure out-of-band channel for sign in with QR](https://github.com/matrix-org/matrix-spec-proposals/pull/4388). ([\#19808](https://github.com/element-hq/synapse/issues/19808))
- Add an `exclude_rooms_from_presence` configuration option to stop presence being routed between users solely because they share one of the listed rooms. ([\#19935](https://github.com/element-hq/synapse/issues/19935))

## Bugfixes

- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Update error responses to match their format in the current draft of the MSC. ([\#19539](https://github.com/element-hq/synapse/issues/19539))
- Lock Sliding Sync connections when inserting lazy members, to prevent repeated deadlocks. ([\#19826](https://github.com/element-hq/synapse/issues/19826))
- Fix the `flag_existing_quarantined_media` background update skipping some quarantined remote media. Introduced in v1.152.0. ([\#19901](https://github.com/element-hq/synapse/issues/19901))
- Fix a bug introduced in Synapse v1.150.0 where reactivating a deactivated and erased user did not restore their profile, breaking login, name changes, and invitations.
  Contributed by @m4us1ne. ([\#19902](https://github.com/element-hq/synapse/issues/19902))
- Fix a regression where application services that opted into ephemeral events using the legacy `de.sorunome.msc2409.push_ephemeral` registration flag stopped receiving ephemeral events (including to-device messages used for encryption). Introduced in v1.156.0. ([\#19928](https://github.com/element-hq/synapse/issues/19928))
- Fix a bug causing device list pruning to skip some rows when the transaction gets retried. ([\#19947](https://github.com/element-hq/synapse/issues/19947))
- Fix presence states being shown to clients forever after presence is disabled, by marking any previously only users as offline. ([\#19948](https://github.com/element-hq/synapse/issues/19948))
- Fix `SYNAPSE_ASYNC_IO_REACTOR=1` on Python 3.14. ([\#19949](https://github.com/element-hq/synapse/issues/19949))

## Deprecations and Removals

- Remove support for experimental [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) auth delegation, in favour of the stable Matrix Authentication Service integration support. See [the upgrade notes](https://element-hq.github.io/synapse/v1.157/upgrade.html#upgrading-to-v11570). ([\#19895](https://github.com/element-hq/synapse/issues/19895))

## Internal Changes

- Port the synchronous core of client event serialization to Rust. ([\#19837](https://github.com/element-hq/synapse/issues/19837), [\#19922](https://github.com/element-hq/synapse/issues/19922))
- Update `HomeserverTestCase.get_success(...)` and friends to drive async Rust (Tokio runtime/thread pool). ([\#19871](https://github.com/element-hq/synapse/issues/19871), [\#19879](https://github.com/element-hq/synapse/issues/19879))
- Allow Rust code to have database access via Python database connection pool. ([\#19878](https://github.com/element-hq/synapse/issues/19878))
- Add `golangci-lint` to CI. ([\#19888](https://github.com/element-hq/synapse/issues/19888))
- Remove wall-clock dependency of `test_redact_messages_all_rooms` test, as this caused flakiness. ([\#19890](https://github.com/element-hq/synapse/issues/19890))
- Change the [MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814) dehydrated device `/events` endpoint from `POST` to `GET`. ([\#19896](https://github.com/element-hq/synapse/issues/19896))
- Change the [MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814) dehydrated device `/events` endpoint paging to match spec conventions. ([\#19897](https://github.com/element-hq/synapse/issues/19897))
- Fix storage type mismatches where values were bound with a type that didn't match their database column. ([\#19911](https://github.com/element-hq/synapse/issues/19911))
- Speed up deletion of old sliding sync connections by adding an index. ([\#19912](https://github.com/element-hq/synapse/issues/19912))
- Add note to 3PID email token request unit tests that the endpoint being tested can have an expected, artificial delay of up to 1s. ([\#19916](https://github.com/element-hq/synapse/issues/19916))
- Add an index to `sliding_sync_connection_lazy_members` to speed up deleting old sliding sync connection positions. ([\#19923](https://github.com/element-hq/synapse/issues/19923))
- Fix `test_lock_contention` being flaky when running against PostgreSQL by budgeting CPU time rather than wall-clock time. ([\#19929](https://github.com/element-hq/synapse/issues/19929))
- Fix Complement test flake when restarting Synapse workers (cross-test pollution caused by nginx upstreams being temporarily unavailable). ([\#19936](https://github.com/element-hq/synapse/issues/19936))
- Add clean deploy `FIXME` note for `TestOIDCProviderUnavailable` (problem tracked by [#19937](https://github.com/element-hq/synapse/issues/19937)). ([\#19938](https://github.com/element-hq/synapse/issues/19938))
- Minor presence performance improvements for large servers. ([\#19939](https://github.com/element-hq/synapse/issues/19939))
- Reduce replication traffic caused by presence. ([\#19941](https://github.com/element-hq/synapse/issues/19941))
- Add `last_active_granularity`, `sync_online_timeout` and `idle_timeout` options to the `presence` config section to allow tuning the presence state machine timers. ([\#19942](https://github.com/element-hq/synapse/issues/19942))




# Synapse 1.156.0 (2026-07-07)

No significant changes since 1.156.0rc1.

# Synapse 1.156.0rc1 (2026-06-30)

## Features

- Expose [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) over [MSC4186 (Simplified) Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4186). ([\#19591](https://github.com/element-hq/synapse/issues/19591))
- Stabilize support for sending ephemeral events to application services, as per [MSC2409](https://github.com/matrix-org/matrix-spec-proposals/pull/2409). Contributed by @jason-famedly @ Famedly. ([\#19758](https://github.com/element-hq/synapse/issues/19758))
- Include `allowed_room_ids` in the `/summary` client-server API response for rooms with restricted join rules, as required by Matrix 1.15.
  Contributed by @FrenchGithubUser @Famedly. ([\#19762](https://github.com/element-hq/synapse/issues/19762))
- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Allow authentication on delayed event management endpoints (such as `/restart`) to bypass ratelimits for unauthenticated requests based on the client IP address. ([\#19794](https://github.com/element-hq/synapse/issues/19794))
- Add new metric `synapse_non_deactivated_user_count` which tracks the number of non-deactivated users in the database, split by `app_service`. ([\#19848](https://github.com/element-hq/synapse/issues/19848))
- The `GET /_matrix/client/unstable/org.matrix.msc1763/retention/configuration` endpoint is now provided when retention
  is enabled and `experimental_features.msc1763_enabled` is enabled, based on
  [MSC1763](https://github.com/matrix-org/matrix-spec-proposals/pull/1763). ([\#19853](https://github.com/element-hq/synapse/issues/19853))
- Add experimental support for [MSC4491: Invite reasons in room creation](https://github.com/matrix-org/matrix-spec-proposals/pull/4491). ([\#19874](https://github.com/element-hq/synapse/issues/19874))

## Bugfixes

- Provide remote servers a way to find out about an event created during the remote join handshake. Contributed by @FrenchGithubUser and @jason-famedly @ Famedly. ([\#19390](https://github.com/element-hq/synapse/issues/19390), [\#19855](https://github.com/element-hq/synapse/issues/19855), [\#19856](https://github.com/element-hq/synapse/issues/19856))
- Advertise `org.matrix.msc4143` in `unstable_features` when `msc4143_enabled` is set. ([\#19646](https://github.com/element-hq/synapse/issues/19646))
- Fix a long-standing bug where the badge notification count for a room could become permanently inflated if a read receipt was sent before the room's notification counts were first summarised. ([\#19785](https://github.com/element-hq/synapse/issues/19785))
- Fix startup listener logging to report the actual bound TCP port, so listeners configured with port `0` no longer log `Synapse now listening on TCP port 0`. ([\#19810](https://github.com/element-hq/synapse/issues/19810))
- Fix notification counts being inflated after a `/purge_history` when notifications had already been rotated into the summary table. ([\#19834](https://github.com/element-hq/synapse/issues/19834))
- Fix `/sync` caching transient errors for the `sync_response_cache_duration`. ([\#19845](https://github.com/element-hq/synapse/issues/19845))
- Fix local events being deleted by the [Purge History admin API](https://element-hq.github.io/synapse/v1.155/admin_api/purge_history_api.html) despite `delete_local_events` being set to false, in room versions other than 1 and 2. ([\#19850](https://github.com/element-hq/synapse/issues/19850))
- Fix a bug where a user's dehydrated device ([MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814)) was deleted when their device list was synced from Matrix Authentication Service (e.g. upon logging out their last device), breaking offline key delivery. ([\#19892](https://github.com/element-hq/synapse/issues/19892))

## Improved Documentation

- Update `auto_join_rooms` config documentation to cover requirements for auto-joining invite-only rooms. ([\#19660](https://github.com/element-hq/synapse/issues/19660))
- Add stable endpoint for [MSC3266: Room summary API](https://github.com/matrix-org/matrix-spec-proposals/pull/3266) into worker docs. Contributed by @olmari. ([\#19788](https://github.com/element-hq/synapse/issues/19788))
- Tweak wording of Rust crate dependency update policy. ([\#19829](https://github.com/element-hq/synapse/issues/19829))
- Fixed the Admin API user endpoint documentation examples to use JSON booleans (true/false) instead of numeric (0/1) values. ([\#19847](https://github.com/element-hq/synapse/issues/19847))

## Internal Changes

- Make `simple_select_one_onecol_txn()` more helpful by naming the table of the select - as all other query wrapper functions already did. ([\#19869](https://github.com/element-hq/synapse/issues/19869))
- Refactor `get_user_which_could_invite` logic to reuse `get_users_which_can_issue_invite`. Contributed by Noah Markert. ([\#19732](https://github.com/element-hq/synapse/issues/19732))
- Fix a flaky test (`twisted.protocols.amp.TooLong` error under `trial -jN`) caused by an oversized debug log line. ([\#19832](https://github.com/element-hq/synapse/issues/19832))
- Upload Complement test logs as CI artifacts instead of printing the raw output to the build log. ([\#19840](https://github.com/element-hq/synapse/issues/19840))
- Fix release script considering any workflow completion as successful. ([\#19843](https://github.com/element-hq/synapse/issues/19843))
- Force keyword-args for clear `default_config(server_name="test")` usage in test utilities. ([\#19849](https://github.com/element-hq/synapse/issues/19849))
- Add `.ruff_cache/` directory to `.gitignore`. ([\#19854](https://github.com/element-hq/synapse/issues/19854))
- Bump `poetry` in CI from `2.2.1` to `2.4.1`. ([\#19866](https://github.com/element-hq/synapse/issues/19866), [\#19877](https://github.com/element-hq/synapse/issues/19877))
- Split out `deferred` and `tokio_runtime` to their own Rust modules. ([\#19868](https://github.com/element-hq/synapse/issues/19868))
- Prevent the `cargo-test` and `cargo-bench` CI jobs from being skipped, even on PRs that have Rust changes. ([\#19883](https://github.com/element-hq/synapse/issues/19883))


# Synapse 1.155.0 (2026-06-16)

## End of Life of Debian 12 Bookworm

The next version of Synapse will not include Debian packages for Debian 12 Bookworm
as it reached end of life on the 10th of June 2026.

## Internal Changes

- When building releases, don't cancel Debian package builds when one of them fails. ([\#19842](https://github.com/element-hq/synapse/issues/19842))

# Synapse 1.155.0rc1 (2026-06-09)

## Bugfixes

- Limit the to-device EDU size to a reasonable value to mitigate long queues of to-device messages preventing outgoing federation because of the size of the transaction. ([\#19617](https://github.com/element-hq/synapse/issues/19617))
- Work around bug that sometimes breaks joining restricted rooms that require a remote join. Contributed by @tulir @ Beeper. ([\#19730](https://github.com/element-hq/synapse/issues/19730))
- Update Sliding Sync to return a new response immediately if a room subscription has changed and produced a new response. ([\#19734](https://github.com/element-hq/synapse/issues/19734), [\#19792](https://github.com/element-hq/synapse/issues/19792))
- Fix the `/capabilities` endpoint returning a 500 error on non-media workers when [MSC4452: Preview URL capabilities API](https://github.com/matrix-org/matrix-spec-proposals/pull/4452) is enabled. ([\#19839](https://github.com/element-hq/synapse/issues/19839))

## Improved Documentation

- Document how to see Rust build failure output when using `poetry install`. ([\#19818](https://github.com/element-hq/synapse/issues/19818))
- Document that the SQLite version included in Ubuntu LTS, aside from ESM-only versions, is included in our support policy. ([\#19823](https://github.com/element-hq/synapse/issues/19823))

## Internal Changes

- Port the Python Event classes to Rust. ([\#19701](https://github.com/element-hq/synapse/issues/19701), [\#19816](https://github.com/element-hq/synapse/issues/19816), [\#19817](https://github.com/element-hq/synapse/issues/19817), [\#19819](https://github.com/element-hq/synapse/issues/19819))
- Added tests to ensure that email notification links are sanitized. Contributed by Noah Markert. ([\#19741](https://github.com/element-hq/synapse/issues/19741))
- Add `GcpJsonFormatter` logging formatter for use with Google Cloud Logging and GKE deployments. ([\#19775](https://github.com/element-hq/synapse/issues/19775))
- Add more logging to the to-device message replication stream. ([\#19801](https://github.com/element-hq/synapse/issues/19801), [\#19821](https://github.com/element-hq/synapse/issues/19821))
- Port `Requester` class to Rust. ([\#19828](https://github.com/element-hq/synapse/issues/19828))

# Synapse 1.154.0 (2026-06-04)

No significant changes since 1.154.0rc1.

# Synapse 1.154.0rc1 (2026-05-27)

## Features

- Add support for [MSC4452: Preview URL capabilities API](https://github.com/matrix-org/matrix-spec-proposals/pull/4452) which exposes a `io.element.msc4452.preview_url` capability.
  If `experimental_features.msc4452_enabled` is `true`, the `/_matrix/(client/v1/media|media/v3)/preview_url` endpoint
  now responds with a 403 status code when the capability is disabled. ([\#19715](https://github.com/element-hq/synapse/issues/19715))

## Bugfixes

- Fix a bug in [MSC4186: Simplified Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4186) that could prevent user avatars from showing if the room had an empty name. ([\#19468](https://github.com/element-hq/synapse/issues/19468), [\#19791](https://github.com/element-hq/synapse/issues/19791))
- Fix access token cache not being invalidated for sessions using refresh tokens. Contributed by @FrenchGithubUser @ Famedly. ([\#19483](https://github.com/element-hq/synapse/issues/19483))
- Fix bug where Synapse would return 400 (`M_BAD_JSON`) when sending a message with a `mentions` field and Synapse module `check_event_allowed` callback registered (frozen event). Contributed by @gaetan-sbt. ([\#19634](https://github.com/element-hq/synapse/issues/19634))
- Fix long-standing but niche bug with `/sync` where it could attempt to fetch data with flawed invalid future tokens. ([\#19644](https://github.com/element-hq/synapse/issues/19644))
- Fix `/sync` failing when [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) are enabled and the sync request filters out Ephemeral Data Units (EDUs). ([\#19787](https://github.com/element-hq/synapse/issues/19787))
- Fix packaging for Fedora and EPEL caused by unnecessary bumping `attrs` minimum version requirement in `pyproject.toml` file. Contributed by Oleg Girko. ([\#19789](https://github.com/element-hq/synapse/issues/19789))
- Fix merging signatures when a policy server is running under the same server name as Synapse. The bug was re-introduced in v1.153.0rc1 after being fixed earlier in v1.151.0rc1. Contributed by @tulir @ Beeper. ([\#19797](https://github.com/element-hq/synapse/issues/19797))

## Improved Documentation

- Added details about how Synapse syncs the picture claim when `update_profile_information` setting is true. ([\#19508](https://github.com/element-hq/synapse/issues/19508))

## Internal Changes

- Port `Event.content` field to Rust. ([\#19725](https://github.com/element-hq/synapse/issues/19725))
- Prefer close backfill points (absolute distance). ([\#19748](https://github.com/element-hq/synapse/issues/19748))
- Replace unique `quarantined_media` waiting patterns with standard `wait_for_stream_token(...)`. ([\#19764](https://github.com/element-hq/synapse/issues/19764))
- Improve Synapse logging around when someone encounters `We can't get valid state history.` so you can correlate everything by `event_id`. ([\#19765](https://github.com/element-hq/synapse/issues/19765))
- Tidy up Rust `RoomVersion` structs. ([\#19766](https://github.com/element-hq/synapse/issues/19766))
- Update `WorkerLock` tests to better stress the `WORKER_LOCK_MAX_RETRY_INTERVAL`. ([\#19772](https://github.com/element-hq/synapse/issues/19772))
- Refactor [MSC4242: State DAG](https://github.com/matrix-org/matrix-spec-proposals/pull/4242) checks behind a single `TypeIs` helper to avoid scattered `isinstance` casts. ([\#19774](https://github.com/element-hq/synapse/issues/19774))
- Use `StrCollection` for `prev_state_events`. ([\#19777](https://github.com/element-hq/synapse/issues/19777))
- Fix up the construction of events in tests, ahead of the Rust event port. ([\#19781](https://github.com/element-hq/synapse/issues/19781))




# Synapse 1.153.0 (2026-05-19)

No significant changes since 1.153.0rc3.


# Synapse 1.153.0rc3 (2026-05-15)

## Bugfixes

- Revert 'Have [MSC4186: Simplified Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4186) return a new response immediately if a room subscription has changed and produced a new response. ([\#19714](https://github.com/element-hq/synapse/issues/19714))' (introduced in 1.153.0rc1) due to performance problems. ([\#19784](https://github.com/element-hq/synapse/issues/19784))


# Synapse 1.153.0rc2 (2026-05-13)

## Bugfixes

- Correctly handle arbitrary precision integers in `unsigned` field of events. The bug was introduced in 1.153.0rc1. ([\#19769](https://github.com/element-hq/synapse/issues/19769))


# Synapse 1.153.0rc1 (2026-05-08)

## Features

- Make ACLs apply to EDUs per [MSC4163](https://github.com/matrix-org/matrix-spec-proposals/pull/4163). ([\#18475](https://github.com/element-hq/synapse/issues/18475))
- Stabilize [MSC3266: Room summary API](https://github.com/matrix-org/matrix-spec-proposals/pull/3266), removing the experimental config flag `msc3266_enabled`. Contributed by @dasha-uwu. ([\#19720](https://github.com/element-hq/synapse/issues/19720))
- Partial [MSC4311](https://github.com/matrix-org/matrix-spec-proposals/pull/4311) implementation: `m.room.create` is now a required part of stripped `invite_state`/`knock_state` . Contributed by @FrenchGithubUser @Famedly. ([\#19722](https://github.com/element-hq/synapse/issues/19722))
- Expose `tombstoned` and `replacement_room` in room details on admin API endpoint `GET /_synapse/admin/v1/rooms/<room_id>`. Contributed by Noah Markert. ([\#19737](https://github.com/element-hq/synapse/issues/19737))

## Bugfixes

- Allow self-requested user erasure (upon account deactivation) to succeed even if Synapse has disabled profile changes. Contributed by Famedly. ([\#19398](https://github.com/element-hq/synapse/issues/19398))
- Fix Synapse not backfilling new history when attempting to use a pagination token near a backward extremity. ([\#19611](https://github.com/element-hq/synapse/issues/19611))
- Have [MSC4186: Simplified Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4186) return a new response immediately if a room subscription has changed and produced a new response. ([\#19714](https://github.com/element-hq/synapse/issues/19714))
- Fix a bug where when upgrading a room to room version 12, the power level event in the old room got temporarily mutated to remove the user upgrading the room's power. ([\#19727](https://github.com/element-hq/synapse/issues/19727))
- Fix packaging for Fedora and EPEL caused by unnecessary bumping `authlib` minimum version requirement in `pyproject.toml` file. Contributed by Oleg Girko. ([\#19742](https://github.com/element-hq/synapse/issues/19742))

## Improved Documentation

- Add warning about known problems when configuring `use_frozen_dicts`. ([\#19711](https://github.com/element-hq/synapse/issues/19711))

## Internal Changes

- Port `Event.signatures` field to Rust. ([\#19706](https://github.com/element-hq/synapse/issues/19706))
- Port `Event.unsigned` field to Rust. ([\#19708](https://github.com/element-hq/synapse/issues/19708))
- Add a Rust canonical JSON serializer. ([\#19739](https://github.com/element-hq/synapse/issues/19739), [\#19763](https://github.com/element-hq/synapse/issues/19763))
- Configure Dependabot to only update Python dependencies in the lockfile, unless widening upper bounds. ([\#19743](https://github.com/element-hq/synapse/issues/19743))
- Reduce `WORKER_LOCK_MAX_RETRY_INTERVAL` to 5 seconds to reduce idle time after lock is released. ([\#19755](https://github.com/element-hq/synapse/issues/19755))
- Force keyword-only arguments for `Duration` so time units have to be specified. ([\#19756](https://github.com/element-hq/synapse/issues/19756))


# Synapse 1.152.1 (2026-05-07)

## Security Fixes

- Prevent CPU starvation (Denial of Service) under worker lock contention, additionally capping the `WorkerLock` time out interval to a maximum of 60 seconds. Contributed by Famedly. ([\#19394](https://github.com/element-hq/synapse/issues/19394), ELEMENTSEC-2026-1706, [GHSA-8q93-326v-3m7g](https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g), CVE-2026-45078)
- Prevent pagination ending when a page is full of rejected events. (ELEMENTSEC-2025-1636, [GHSA-6qf2-7x63-mm6v](https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v), CVE-2026-45076)


# Synapse 1.152.0 (2026-04-28)

No significant changes since 1.152.0rc1.

## Configuration changes needed for deployments using workers

For deployments using workers, please note that this version introduces a new `quarantined_media_changes` stream writer, which may require configuration changes.
Please see the [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11520) for details.

Without configuring this new stream writer, only the main process will be able to handle the `/media/quarantine` admin API endpoints for quarantining media.

# Synapse 1.152.0rc1 (2026-04-22)

## Features

- Add a ["Listing quarantined media changes" Admin API](https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#listing-quarantined-media-changes) for retrieving a paginated record of when media became (un)quarantined. ([\#19558](https://github.com/element-hq/synapse/issues/19558), [\#19677](https://github.com/element-hq/synapse/issues/19677), [\#19694](https://github.com/element-hq/synapse/issues/19694))
- Advertise [MSC4445](https://github.com/matrix-org/matrix-spec-proposals/pull/4445) sync timeline order in `unstable_features`. ([\#19642](https://github.com/element-hq/synapse/issues/19642))
- Report the Rust compiler version used in the Prometheus metrics. Contributed by Noah Markert. ([\#19643](https://github.com/element-hq/synapse/issues/19643))
- Passthrough 'article' and 'profile' OpenGraph metadata on URL preview requests. ([\#19659](https://github.com/element-hq/synapse/issues/19659))
- Add a way to re-sign local events with a new signing key. ([\#19668](https://github.com/element-hq/synapse/issues/19668))
- Support [MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On](https://github.com/matrix-org/matrix-spec-proposals/pull/4450). ([\#19693](https://github.com/element-hq/synapse/issues/19693))
- Add experimental support for [MSC4242](https://github.com/matrix-org/matrix-spec-proposals/pull/4242): State DAGs. Excludes federation support. ([\#19424](https://github.com/element-hq/synapse/issues/19424))
- Adds [Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/index.html) endpoints to
  list, fetch and delete user reports. ([\#19657](https://github.com/element-hq/synapse/issues/19657))
- Reduce database disk space usage by pruning old rows from `device_lists_changes_in_room`. ([\#19473](https://github.com/element-hq/synapse/issues/19473), [\#19709](https://github.com/element-hq/synapse/issues/19709))

## Bugfixes

- Reject `device_keys: null` in the request to [`POST /_matrix/client/v3/keys/upload`](https://spec.matrix.org/v1.16/client-server-api/#post_matrixclientv3keysupload), as per the spec. This was temporarily allowed as a workaround for misbehaving clients. ([\#19637](https://github.com/element-hq/synapse/issues/19637))
- Fix database migrations failing on platforms where SQLite is configured with `SQLITE_DBCONFIG_DEFENSIVE` by default, such as macOS. ([\#19690](https://github.com/element-hq/synapse/issues/19690))
- Fix a bug introduced in v1.145 where a non-admin could bypass admin checks for downloading remote quarantined media. This relied on the media already being previously present on the homeserver. ([\#19639](https://github.com/element-hq/synapse/issues/19639))

## Improved Documentation

- Include a workaround for running the unit tests with SQLite under recent versions of MacOS. ([\#19615](https://github.com/element-hq/synapse/issues/19615))
- Fix Docker image link typo in worker docs. ([\#19645](https://github.com/element-hq/synapse/issues/19645))
- Update the developer stream docs for creating a new stream to point out `_setup_sequence(...)` in `portdb`. ([\#19675](https://github.com/element-hq/synapse/issues/19675))
- Update the developer stream docs for creating a new stream to highlight places that require documentation updates. ([\#19696](https://github.com/element-hq/synapse/issues/19696))

## Internal Changes

- Update CI to use re-usable Complement GitHub CI workflow. ([\#19533](https://github.com/element-hq/synapse/issues/19533))
- Fix docstring for `limit` argument in `_maybe_backfill_inner(...)`. ([\#19630](https://github.com/element-hq/synapse/issues/19630))
- Document context for why increase timeout for policy server requests. ([\#19633](https://github.com/element-hq/synapse/issues/19633))
- Run lint script to format Complement tests introduced in [#19509](https://github.com/element-hq/synapse/pull/19509). ([\#19636](https://github.com/element-hq/synapse/issues/19636))
- Small simplifications to the events class. ([\#19680](https://github.com/element-hq/synapse/issues/19680), [\#19712](https://github.com/element-hq/synapse/issues/19712))
- Introduce `spam_checker_spammy` internal event metadata. ([\#19453](https://github.com/element-hq/synapse/issues/19453))
- Add a `FilteredEvent` class that saves us copying events. ([\#19640](https://github.com/element-hq/synapse/issues/19640))
- Convert `EventInternalMetadata` to use `Arc<RwLock<_>>`. ([\#19669](https://github.com/element-hq/synapse/issues/19669))


# Synapse 1.151.0 (2026-04-07)

## Bugfixes

- Fix `KNOWN_ROOM_VERSIONS.__contains__` raising `TypeError` for non-string keys, which could cause `/sync` to fail for rooms with a `NULL` room version in the database. Bug introduced in [#19589](https://github.com/element-hq/synapse/pull/19589) as part of v1.151.0rc1. ([\#19649](https://github.com/element-hq/synapse/issues/19649))




# Synapse 1.151.0rc1 (2026-03-31)

## Features

- Add stable support for [MSC4284](https://github.com/matrix-org/matrix-spec-proposals/pull/4284) Policy Servers. ([\#19503](https://github.com/element-hq/synapse/issues/19503))
- Update and stabilize support for [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666): Get rooms in common with another user. Contributed by @tulir @ Beeper. ([\#19511](https://github.com/element-hq/synapse/issues/19511))
- Updated experimental support for [MSC4388: Secure out-of-band channel for sign in with QR](https://github.com/matrix-org/matrix-spec-proposals/pull/4388). ([\#19573](https://github.com/element-hq/synapse/issues/19573))
- Stabilize `room_version` and `encryption` fields in the space/room `/hierarchy` API (part of [MSC3266](https://github.com/matrix-org/matrix-spec-proposals/pull/3266)). ([\#19576](https://github.com/element-hq/synapse/issues/19576))
- Introduce a [configuration option](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#matrix_authentication_service) to allow using HTTP/2 over plaintext when Synapse connects to Matrix Authentication Service. ([\#19586](https://github.com/element-hq/synapse/issues/19586))

## Bugfixes

- Fix [MSC4284](https://github.com/matrix-org/matrix-spec-proposals/pull/4284) Policy Servers implementation to skip signing `org.matrix.msc4284.policy` and `m.room.policy` state events. ([\#19503](https://github.com/element-hq/synapse/issues/19503))
- Correctly apply [MSC4284](https://github.com/matrix-org/matrix-spec-proposals/pull/4284) Policy Server signatures to events when the sender and policy server have the same server name. ([\#19503](https://github.com/element-hq/synapse/issues/19503))
- Allow Synapse to start up even when discovery fails for an OpenID Connect provider. ([\#19509](https://github.com/element-hq/synapse/issues/19509))
- Fix quarantine media admin APIs sometimes returning inaccurate counts for remote media. ([\#19559](https://github.com/element-hq/synapse/issues/19559))
- Fix `Build and push complement image` CI job not having `poetry` available for the Complement runner script. ([\#19578](https://github.com/element-hq/synapse/issues/19578))
- Increase timeout for policy server requests to avoid repeated requests for checking media. ([\#19629](https://github.com/element-hq/synapse/issues/19629))

## Deprecations and Removals

- Remove support for [MSC3852: Expose user agent information on Device](https://github.com/matrix-org/matrix-spec-proposals/pull/3852) as the MSC was closed. ([\#19430](https://github.com/element-hq/synapse/issues/19430))

## Internal Changes

- Fix small comment typo in config output from the `demo/start.sh` script. ([\#19538](https://github.com/element-hq/synapse/issues/19538))
- Add MSC3820 comment context to `RoomVersion` attributes. ([\#19577](https://github.com/element-hq/synapse/issues/19577))
- Remove `redacted_because` from internal unsigned. ([\#19581](https://github.com/element-hq/synapse/issues/19581))
- Prevent sending registration emails if registration is disabled. ([\#19585](https://github.com/element-hq/synapse/issues/19585))
- Port `RoomVersion` to Rust. ([\#19589](https://github.com/element-hq/synapse/issues/19589))
- Only show failing Complement tests in the formatted output in CI. ([\#19590](https://github.com/element-hq/synapse/issues/19590))
- Ensure old Complement test files are removed when downloading a Complement checkout via `./scripts-dev/complement.sh`. ([\#19592](https://github.com/element-hq/synapse/issues/19592))
- Update `HomeserverTestCase.pump()` docstring to demystify behavior (Twisted reactor/clock). ([\#19602](https://github.com/element-hq/synapse/issues/19602))
- Deprecate `HomeserverTestCase.pump()` in favor of more direct `HomeserverTestCase.reactor.advance(...)` usage. ([\#19602](https://github.com/element-hq/synapse/issues/19602))
- Lower the Postgres database `statement_timeout` to 10m (previously 1h). ([\#19604](https://github.com/element-hq/synapse/issues/19604))




# Synapse 1.150.0 (2026-03-24)

No significant changes since 1.150.0rc1.




# Synapse 1.150.0rc1 (2026-03-17)

## Features

- Add experimental support for the [MSC4370](https://github.com/matrix-org/matrix-spec-proposals/pull/4370) Federation API `GET /extremities` endpoint. ([\#19314](https://github.com/element-hq/synapse/issues/19314))
- [MSC4140: Cancellable delayed events](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): When persisting a delayed event to the timeline, include its `delay_id` in the event's `unsigned` section in `/sync` responses to the event sender. ([\#19479](https://github.com/element-hq/synapse/issues/19479))
- Expose [MSC4354 Sticky Events](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) over the legacy (v3) /sync API. ([\#19487](https://github.com/element-hq/synapse/issues/19487))
- When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. ([\#19554](https://github.com/element-hq/synapse/issues/19554))

## Bugfixes

- Fix `Build and push complement image` CI job pointing to non-existent image. ([\#19523](https://github.com/element-hq/synapse/issues/19523))
- Fix a bug introduced in v1.26.0 that caused deactivated, erased users to not be removed from the user directory. ([\#19542](https://github.com/element-hq/synapse/issues/19542))

## Improved Documentation

- In the Admin API documentation, always express path parameters as `/<param>` instead of as `/$param`. ([\#19307](https://github.com/element-hq/synapse/issues/19307))
- Update docs to clarify `outbound_federation_restricted_to` can also be used with the [Secure Border Gateway (SBG)](https://element.io/en/server-suite/secure-border-gateways). ([\#19517](https://github.com/element-hq/synapse/issues/19517))
- Unify Complement developer docs. ([\#19518](https://github.com/element-hq/synapse/issues/19518))

## Internal Changes

- Put membership updates in a background resumable task when changing the avatar or the display name. ([\#19311](https://github.com/element-hq/synapse/issues/19311))
- Add in-repo Complement test to sanity check Synapse version matches git checkout (testing what we think we are). ([\#19476](https://github.com/element-hq/synapse/issues/19476))
- Migrate `dev` dependencies to [PEP 735](https://peps.python.org/pep-0735/) dependency groups. ([\#19490](https://github.com/element-hq/synapse/issues/19490))
- Remove the optional `systemd-python` dependency and the `systemd` extra on the `synapse` package. ([\#19491](https://github.com/element-hq/synapse/issues/19491))
- Avoid re-computing the event ID when cloning events. ([\#19527](https://github.com/element-hq/synapse/issues/19527))
- Allow caching of the `/versions` and `/auth_metadata` public endpoints. ([\#19530](https://github.com/element-hq/synapse/issues/19530))
- Add a few labels to the number groupings in the `Processed request` logs. ([\#19548](https://github.com/element-hq/synapse/issues/19548))




# Synapse 1.149.1 (2026-03-11)

## Internal Changes

- Bump `matrix-synapse-ldap3` to `0.4.0` to support `setuptools>=82.0.0`. Fixes [\#19541](https://github.com/element-hq/synapse/issues/19541). ([\#19543](https://github.com/element-hq/synapse/issues/19543))




# Synapse 1.149.0 (2026-03-10)

No significant changes since 1.149.0rc1.




# Synapse 1.149.0rc1 (2026-03-03)

## Features

- Add experimental support for [MSC4388: Secure out-of-band channel for sign in with QR](https://github.com/matrix-org/matrix-spec-proposals/pull/4388). ([\#19127](https://github.com/element-hq/synapse/issues/19127))
- Add stable support for [MSC4380](https://github.com/matrix-org/matrix-spec-proposals/pull/4380) invite blocking. ([\#19431](https://github.com/element-hq/synapse/issues/19431))

## Bugfixes

- Fix the 'Login as a user' Admin API not checking if the user exists before issuing an access token. ([\#18518](https://github.com/element-hq/synapse/issues/18518))
- Fix `/sync` missing membership event in `state_after` (experimental [MSC4222](https://github.com/matrix-org/matrix-spec-proposals/pull/4222) implementation) in some scenarios. ([\#19460](https://github.com/element-hq/synapse/issues/19460))

## Internal Changes

- Add log to explain when and why we freeze objects in the garbage collector. ([\#19440](https://github.com/element-hq/synapse/issues/19440))
- Better instrument `JoinRoomAliasServlet` with tracing. ([\#19461](https://github.com/element-hq/synapse/issues/19461))
- Fix Complement CI not running against the code from our PRs. ([\#19475](https://github.com/element-hq/synapse/issues/19475))
- Log `docker system info` in CI so we have a plain record of how GitHub runners evolve over time. ([\#19480](https://github.com/element-hq/synapse/issues/19480))
- Rename the `test_disconnect` test helper so that pytest doesn't see it as a test. ([\#19486](https://github.com/element-hq/synapse/issues/19486))
- Add a log line when we delete devices. Contributed by @bradtgmurray @ Beeper. ([\#19496](https://github.com/element-hq/synapse/issues/19496))
- Pre-allocate the buffer based on the expected `Content-Length` with the Rust HTTP client. ([\#19498](https://github.com/element-hq/synapse/issues/19498))
- Cancel long-running sync requests if the client has gone away. ([\#19499](https://github.com/element-hq/synapse/issues/19499))
- Try and reduce reactor tick times when under heavy load. ([\#19507](https://github.com/element-hq/synapse/issues/19507))
- Simplify Rust HTTP client response streaming and limiting. ([\#19510](https://github.com/element-hq/synapse/issues/19510))
- Replace deprecated collection import locations with current locations. ([\#19515](https://github.com/element-hq/synapse/issues/19515))
- Bump most locked Python dependencies to their latest versions. ([\#19519](https://github.com/element-hq/synapse/issues/19519))




# Synapse 1.148.0 (2026-02-24)

No significant changes since 1.148.0rc1.




# Synapse 1.148.0rc1 (2026-02-17)

## Features

- Support sending and receiving [MSC4354 Sticky Event](https://github.com/matrix-org/matrix-spec-proposals/pull/4354) metadata. ([\#19365](https://github.com/element-hq/synapse/issues/19365))

## Improved Documentation

- Fix reference to the `experimental_features` section of the configuration manual documentation. ([\#19435](https://github.com/element-hq/synapse/issues/19435))

## Deprecations and Removals

- Remove support for [MSC3244: Room version capabilities](https://github.com/matrix-org/matrix-spec-proposals/pull/3244) as the MSC was rejected. ([\#19429](https://github.com/element-hq/synapse/issues/19429))

## Internal Changes

- Add in-repo Complement tests so we can test Synapse specific behavior at an end-to-end level. ([\#19406](https://github.com/element-hq/synapse/issues/19406))
- Push Synapse docker images to Element OCI Registry. ([\#19420](https://github.com/element-hq/synapse/issues/19420))
- Allow configuring the Rust HTTP client to use HTTP/2 only. ([\#19457](https://github.com/element-hq/synapse/issues/19457))
- Correctly refuse to start if the Rust workspace config has changed and the Rust library has not been rebuilt. ([\#19470](https://github.com/element-hq/synapse/issues/19470))




# Synapse 1.147.1 (2026-02-12)

## Internal Changes

- Block federation requests and events authenticated using a known insecure signing key. See [CVE-2026-24044](https://www.cve.org/CVERecord?id=CVE-2026-24044) / [ELEMENTSEC-2025-1670](https://github.com/element-hq/ess-helm/security/advisories/GHSA-qwcj-h6m8-vp6q). ([\#19459](https://github.com/element-hq/synapse/issues/19459))




# Synapse 1.147.0 (2026-02-10)

No significant changes since 1.147.0rc1.

# Synapse 1.147.0rc1 (2026-02-03)

## Bugfixes

- Fix memory leak caused by not cleaning up stopped looping calls. Introduced in v1.140.0. ([\#19416](https://github.com/element-hq/synapse/issues/19416))
- Fix a typo that incorrectly made `setuptools_rust` a runtime dependency. ([\#19417](https://github.com/element-hq/synapse/issues/19417))

## Internal Changes

- Prune stale entries from `sliding_sync_connection_required_state` table. ([\#19306](https://github.com/element-hq/synapse/issues/19306))
- Update "Event Send Time Quantiles" graph to only use dots for the event persistence rate (Grafana dashboard). ([\#19399](https://github.com/element-hq/synapse/issues/19399))
- Update and align Grafana dashboard to use regex matching for `job` selectors (`job=~"$job"`) so the "all" value works correctly across all panels. ([\#19400](https://github.com/element-hq/synapse/issues/19400))
- Don't retry joining partial state rooms all at once on startup. ([\#19402](https://github.com/element-hq/synapse/issues/19402))
- Disallow requests to the health endpoint from containing trailing path characters. ([\#19405](https://github.com/element-hq/synapse/issues/19405))
- Add notes that new experimental features should have associated tracking issues. ([\#19410](https://github.com/element-hq/synapse/issues/19410))
- Bump `pyo3` from 0.26.0 to 0.27.2 and `pythonize` from 0.26.0 to 0.27.0. Contributed by @razvp @ ERCOM. ([\#19412](https://github.com/element-hq/synapse/issues/19412))




# Synapse 1.146.0 (2026-01-27)

No significant changes since 1.146.0rc1.

## Deprecations and Removals

- [MSC2697](https://github.com/matrix-org/matrix-spec-proposals/pull/2697) (Dehydrated devices) has been removed, as the MSC is closed. Developers should migrate to [MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814). ([\#19346](https://github.com/element-hq/synapse/issues/19346))
- Support for Ubuntu 25.04 (Plucky Puffin) has been dropped. Synapse no longer builds debian packages for Ubuntu 25.04.



# Synapse 1.146.0rc1 (2026-01-20)

## Features

- Add a new config option [`enable_local_media_storage`](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#enable_local_media_storage) which controls whether media is additionally stored locally when using configured `media_storage_providers`. Setting this to `false` allows off-site media storage without a local cache. Contributed by Patrice Brend'amour @dr.allgood. ([\#19204](https://github.com/element-hq/synapse/issues/19204))
- Stabilise support for [MSC4312](https://github.com/matrix-org/matrix-spec-proposals/pull/4312)'s `m.oauth` User-Interactive Auth stage for resetting cross-signing identity with the OAuth 2.0 API. The old, unstable name (`org.matrix.cross_signing_reset`) is now deprecated and will be removed in a future release. ([\#19273](https://github.com/element-hq/synapse/issues/19273))
- Refactor Grafana dashboard to use `server_name` label (instead of `instance`). ([\#19337](https://github.com/element-hq/synapse/issues/19337))

## Bugfixes

- Fix joining a restricted v12 room locally when no local room creator is present but local users with sufficient power levels are. Contributed by @nexy7574. ([\#19321](https://github.com/element-hq/synapse/issues/19321))
- Fixed parallel calls to `/_matrix/media/v1/create` being ratelimited for appservices even if `rate_limited: false` was set in the registration. Contributed by @tulir @ Beeper. ([\#19335](https://github.com/element-hq/synapse/issues/19335))
- Fix a bug introduced in 1.61.0 where a user's membership in a room was accidentally ignored when considering access to historical state events in rooms with the "shared" history visibility. Contributed by Lukas Tautz. ([\#19353](https://github.com/element-hq/synapse/issues/19353))
- [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Store the JSON content of scheduled delayed events as text instead of a byte array. This fixes the inability to schedule a delayed event with non-ASCII characters in its content. ([\#19360](https://github.com/element-hq/synapse/issues/19360))
- Always rollback database transactions when retrying (avoid orphaned connections). ([\#19372](https://github.com/element-hq/synapse/issues/19372))
- Fix `InFlightGauge` typing to allow upgrading to `prometheus_client` 0.24. ([\#19379](https://github.com/element-hq/synapse/issues/19379))

## Updates to the Docker image

- Add [Prometheus HTTP service discovery](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#http_sd_config) endpoint for easy discovery of all workers when using the `docker/Dockerfile-workers` image (see the [*Metrics* section of our Docker testing docs](docker/README-testing.md#metrics)). ([\#19336](https://github.com/element-hq/synapse/issues/19336))

## Improved Documentation

- Remove docs on legacy metric names (no longer in the codebase since 2022-12-06). ([\#19341](https://github.com/element-hq/synapse/issues/19341))
- Clarify how the estimated value of room complexity is calculated internally. ([\#19384](https://github.com/element-hq/synapse/issues/19384))

## Internal Changes

- Add an internal `cancel_task` API to the task scheduler. ([\#19310](https://github.com/element-hq/synapse/issues/19310))
- Tweak docstrings and signatures of `auth_types_for_event` and `get_catchup_room_event_ids`. ([\#19320](https://github.com/element-hq/synapse/issues/19320))
- Replace usage of deprecated `assertEquals` with `assertEqual` in unit test code. ([\#19345](https://github.com/element-hq/synapse/issues/19345))
- Drop support for Ubuntu 25.04 'Plucky Puffin', add support for Ubuntu 25.10 'Questing Quokka'. ([\#19348](https://github.com/element-hq/synapse/issues/19348))
- Revert "Add an Admin API endpoint for listing quarantined media (#19268)". ([\#19351](https://github.com/element-hq/synapse/issues/19351))
- Bump `mdbook` from 0.4.17 to 0.5.2 and remove our custom table-of-contents plugin in favour of the new default functionality. ([\#19356](https://github.com/element-hq/synapse/issues/19356))
- Replace deprecated usage of PyGitHub's `GitRelease.title` with `.name` in release script. ([\#19358](https://github.com/element-hq/synapse/issues/19358))
- Update the Element logo in Synapse's README to be an absolute URL, allowing it to render on other sites (such as PyPI). ([\#19368](https://github.com/element-hq/synapse/issues/19368))
- Apply minor tweaks to v1.145.0 changelog. ([\#19376](https://github.com/element-hq/synapse/issues/19376))
- Update Grafana dashboard syntax to use the latest from importing/exporting with Grafana 12.3.1. ([\#19381](https://github.com/element-hq/synapse/issues/19381))
- Warn about skipping reactor metrics when using unknown reactor type. ([\#19383](https://github.com/element-hq/synapse/issues/19383))
- Add support for reactor metrics with the `ProxiedReactor` used in worker Complement tests. ([\#19385](https://github.com/element-hq/synapse/issues/19385))




# Synapse 1.145.0 (2026-01-13)

No significant changes since 1.145.0rc4.

## End of Life of Ubuntu 25.04 Plucky Puffin

Ubuntu 25.04 (Plucky Puffin) will be end of life on Jan 17, 2026. Synapse will stop building packages for Ubuntu 25.04 shortly thereafter.

## Updates to Locked Dependencies No Longer Included in Changelog

The "Updates to locked dependencies" section has been removed from the changelog due to lack of use and the maintenance burden. ([\#19254](https://github.com/element-hq/synapse/issues/19254))




# Synapse 1.145.0rc4 (2026-01-08)

No significant changes since 1.145.0rc3.

This RC contains a fix specifically for openSUSE packaging and no other changes. 



# Synapse 1.145.0rc3 (2026-01-07)

No significant changes since 1.145.0rc2.

This RC strips out unnecessary files from the wheels that were added when fixing the source distribution packaging in the previous RC.



# Synapse 1.145.0rc2 (2026-01-07)

No significant changes since 1.145.0rc1.

This RC fixes the source distribution packaging for uploading to PyPI.



# Synapse 1.145.0rc1 (2026-01-06)

## Features

- Add `memberships` endpoint to the admin API. This is useful for forensics and T&S purposes. ([\#19260](https://github.com/element-hq/synapse/issues/19260))
- Server admins can bypass the quarantine media check when downloading media by setting the `admin_unsafely_bypass_quarantine` query parameter to `true` on Client-Server API media download requests. ([\#19275](https://github.com/element-hq/synapse/issues/19275))
- Implemented pagination for the [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666) mutual rooms endpoint. Contributed by @tulir @ Beeper. ([\#19279](https://github.com/element-hq/synapse/issues/19279))
- Admin API: add worker support to `GET /_synapse/admin/v2/users/<user_id>`. ([\#19281](https://github.com/element-hq/synapse/issues/19281))
- Improve proxy support for the `federation_client.py` dev script. Contributed by Denis Kasak (@dkasak). ([\#19300](https://github.com/element-hq/synapse/issues/19300))

## Bugfixes

- Fix sliding sync performance slow down for long lived connections. ([\#19206](https://github.com/element-hq/synapse/issues/19206))
- Fix a bug where Mastodon posts (and possibly other embeds) have the wrong description for URL previews. ([\#19231](https://github.com/element-hq/synapse/issues/19231))
- Fix bug where `Duration` was logged incorrectly. ([\#19267](https://github.com/element-hq/synapse/issues/19267))
- Fix bug introduced in 1.143.0 that broke support for versions of `zope-interface` older than 6.2. ([\#19274](https://github.com/element-hq/synapse/issues/19274))
- Transform events with client metadata before serialising in /event response. ([\#19340](https://github.com/element-hq/synapse/issues/19340))

## Updates to the Docker image

- Add a way to expose metrics from the Docker image (`SYNAPSE_ENABLE_METRICS`). ([\#19324](https://github.com/element-hq/synapse/issues/19324))

## Improved Documentation

- Document the importance of `public_baseurl` when configuring OpenID Connect authentication. ([\#19270](https://github.com/element-hq/synapse/issues/19270))

## Deprecations and Removals

- Ubuntu 25.04 (Plucky Puffin) will be end of life on Jan 17, 2026. Synapse will stop building packages for Ubuntu 25.04 shortly thereafter.
- Remove the "Updates to locked dependencies" section from the changelog due to lack of use and the maintenance burden. ([\#19254](https://github.com/element-hq/synapse/issues/19254))

## Internal Changes

- Group together dependabot update PRs to reduce the review load. ([\#18402](https://github.com/element-hq/synapse/issues/18402))
- Fix `HomeServer.shutdown()` failing if the homeserver hasn't been setup yet. ([\#19187](https://github.com/element-hq/synapse/issues/19187))
- Respond with useful error codes with `Content-Length` header/s are invalid. ([\#19212](https://github.com/element-hq/synapse/issues/19212))
- Fix `HomeServer.shutdown()` failing if the homeserver failed to `start`. ([\#19232](https://github.com/element-hq/synapse/issues/19232))
- Switch the build backend from `poetry-core` to `maturin`. ([\#19234](https://github.com/element-hq/synapse/issues/19234))
- Raise the limit for concurrently-open non-security @dependabot PRs from 5 to 10. ([\#19253](https://github.com/element-hq/synapse/issues/19253))
- Require 14 days to pass before pulling in general dependency updates to help mitigate upstream supply chain attacks. ([\#19258](https://github.com/element-hq/synapse/issues/19258))
- Drop the broken netlify documentation workflow until a new one is implemented. ([\#19262](https://github.com/element-hq/synapse/issues/19262))
- Don't include debug logs in `Clock` unless explicitly enabled. ([\#19278](https://github.com/element-hq/synapse/issues/19278))
- Use `uv` to test olddeps to ensure all transitive dependencies use minimum versions. ([\#19289](https://github.com/element-hq/synapse/issues/19289))
- Add a config to be able to rate limit search in the user directory. ([\#19291](https://github.com/element-hq/synapse/issues/19291))
- Log the original bind exception when encountering `Failed to listen on 0.0.0.0, continuing because listening on [::]`. ([\#19297](https://github.com/element-hq/synapse/issues/19297))
- Unpin the version of Rust we use to build Synapse wheels (was 1.82.0) now that MacOS support has been dropped. ([\#19302](https://github.com/element-hq/synapse/issues/19302))
- Make it more clear how `shared_extra_conf` is combined in our Docker configuration scripts. ([\#19323](https://github.com/element-hq/synapse/issues/19323))
- Update CI to stream Complement progress and format logs in a separate step after all tests are done. ([\#19326](https://github.com/element-hq/synapse/issues/19326))
- Format `.github/workflows/tests.yml`. ([\#19327](https://github.com/element-hq/synapse/issues/19327))




# Synapse 1.144.0 (2025-12-09)

## Deprecation of MacOS Python wheels

The team has decided to deprecate and stop publishing python wheels for MacOS.
Synapse docker images will continue to work on MacOS, as will building Synapse
from source (though note this requires a Rust compiler).

## Unstable mutual rooms endpoint is now behind an experimental feature flag

Admins using the unstable [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666) endpoint (`/_matrix/client/unstable/uk.half-shot.msc2666/user/mutual_rooms`),
please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11440) as this release contains changes
that disable that endpoint by default.



No significant changes since 1.144.0rc1.




# Synapse 1.144.0rc1 (2025-12-02)

Admins using the unstable [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666) endpoint (`/_matrix/client/unstable/uk.half-shot.msc2666/user/mutual_rooms`), please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11440) as this release contains changes that disable that endpoint by default.

## Features

- Add experimentatal implememntation of [MSC4380](https://github.com/matrix-org/matrix-spec-proposals/pull/4380) (invite blocking). ([\#19203](https://github.com/element-hq/synapse/issues/19203))
- Allow restarting delayed event timeouts on workers. ([\#19207](https://github.com/element-hq/synapse/issues/19207))

## Bugfixes

- Fix a bug in the database function for fetching state deltas that could result in unnecessarily long query times. ([\#18960](https://github.com/element-hq/synapse/issues/18960))
- Fix v12 rooms when running with `use_frozen_dicts: True`. ([\#19235](https://github.com/element-hq/synapse/issues/19235))
- Fix bug where invalid `canonical_alias` content would return 500 instead of 400. ([\#19240](https://github.com/element-hq/synapse/issues/19240))
- Fix bug where `Duration` was logged incorrectly. ([\#19267](https://github.com/element-hq/synapse/issues/19267))

## Improved Documentation

- Document in the `--config-path` help how multiple files are merged - by merging them shallowly. ([\#19243](https://github.com/element-hq/synapse/issues/19243))

## Deprecations and Removals

- Stop building release wheels for MacOS. ([\#19225](https://github.com/element-hq/synapse/issues/19225))

## Internal Changes

- Improve event filtering for Simplified Sliding Sync. ([\#17782](https://github.com/element-hq/synapse/issues/17782))
- Export `SYNAPSE_SUPPORTED_COMPLEMENT_TEST_PACKAGES` environment variable from `scripts-dev/complement.sh`. ([\#19208](https://github.com/element-hq/synapse/issues/19208))
- Refactor `scripts-dev/complement.sh` logic to avoid `exit` to facilitate being able to source it from other scripts (composable). ([\#19209](https://github.com/element-hq/synapse/issues/19209))
- Expire sliding sync connections that are too old or have too much pending data. ([\#19211](https://github.com/element-hq/synapse/issues/19211))
- Require an experimental feature flag to be enabled in order for the unstable [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666) endpoint (`/_matrix/client/unstable/uk.half-shot.msc2666/user/mutual_rooms`) to be available. ([\#19219](https://github.com/element-hq/synapse/issues/19219))
- Prevent changelog check CI running on @dependabot's PRs even when a human has modified the branch. ([\#19220](https://github.com/element-hq/synapse/issues/19220))
- Auto-fix trailing spaces in multi-line strings and comments when running the lint script. ([\#19221](https://github.com/element-hq/synapse/issues/19221))
- Move towards using a dedicated `Duration` type. ([\#19223](https://github.com/element-hq/synapse/issues/19223), [\#19229](https://github.com/element-hq/synapse/issues/19229))
- Improve robustness of the SQL schema linting in CI. ([\#19224](https://github.com/element-hq/synapse/issues/19224))
- Add log to determine whether clients are using `/messages` as expected. ([\#19226](https://github.com/element-hq/synapse/issues/19226))
- Simplify README and add ESS Getting started section. ([\#19228](https://github.com/element-hq/synapse/issues/19228), [\#19259](https://github.com/element-hq/synapse/issues/19259))
- Add a unit test for ensuring associated refresh tokens are erased when a device is deleted. ([\#19230](https://github.com/element-hq/synapse/issues/19230))
- Prompt user to consider adding future deprecations to the changelog in release script. ([\#19239](https://github.com/element-hq/synapse/issues/19239))
- Fix check of the Rust compiled code being outdated when using source checkout and `.egg-info`. ([\#19251](https://github.com/element-hq/synapse/issues/19251))
- Stop building macos wheels in CI pipeline. ([\#19263](https://github.com/element-hq/synapse/issues/19263))



### Updates to locked dependencies

* Bump Swatinem/rust-cache from 2.8.1 to 2.8.2. ([\#19244](https://github.com/element-hq/synapse/issues/19244))
* Bump actions/checkout from 5.0.0 to 6.0.0. ([\#19213](https://github.com/element-hq/synapse/issues/19213))
* Bump actions/setup-go from 6.0.0 to 6.1.0. ([\#19214](https://github.com/element-hq/synapse/issues/19214))
* Bump actions/setup-python from 6.0.0 to 6.1.0. ([\#19245](https://github.com/element-hq/synapse/issues/19245))
* Bump attrs from 25.3.0 to 25.4.0. ([\#19215](https://github.com/element-hq/synapse/issues/19215))
* Bump docker/metadata-action from 5.9.0 to 5.10.0. ([\#19246](https://github.com/element-hq/synapse/issues/19246))
* Bump http from 1.3.1 to 1.4.0. ([\#19249](https://github.com/element-hq/synapse/issues/19249))
* Bump pydantic from 2.12.4 to 2.12.5. ([\#19250](https://github.com/element-hq/synapse/issues/19250))
* Bump pyopenssl from 25.1.0 to 25.3.0. ([\#19248](https://github.com/element-hq/synapse/issues/19248))
* Bump rpds-py from 0.28.0 to 0.29.0. ([\#19216](https://github.com/element-hq/synapse/issues/19216))
* Bump rpds-py from 0.29.0 to 0.30.0. ([\#19247](https://github.com/element-hq/synapse/issues/19247))
* Bump sentry-sdk from 2.44.0 to 2.46.0. ([\#19218](https://github.com/element-hq/synapse/issues/19218))
* Bump types-bleach from 6.2.0.20250809 to 6.3.0.20251115. ([\#19217](https://github.com/element-hq/synapse/issues/19217))
* Bump types-jsonschema from 4.25.1.20250822 to 4.25.1.20251009. ([\#19252](https://github.com/element-hq/synapse/issues/19252))

# Synapse 1.143.0 (2025-11-25)

## Dropping support for PostgreSQL 13

In line with our [deprecation policy](https://github.com/element-hq/synapse/blob/develop/docs/deprecation_policy.md), we've dropped
support for PostgreSQL 13, as it is no longer supported upstream.
This release of Synapse requires PostgreSQL 14+.

No significant changes since 1.143.0rc2.




# Synapse 1.143.0rc2 (2025-11-18)

## Dropping support for PostgreSQL 13

In line with our [deprecation policy](https://github.com/element-hq/synapse/blob/develop/docs/deprecation_policy.md), we've dropped
support for PostgreSQL 13, as it is no longer supported upstream.
This release of Synapse requires PostgreSQL 14+.


## Internal Changes

- Fixes docker image creation in the release workflow.



# Synapse 1.143.0rc1 (2025-11-18)

## Features

- Support multiple config files in `register_new_matrix_user`. ([\#18784](https://github.com/element-hq/synapse/issues/18784))
- Remove authentication from `POST /_matrix/client/v1/delayed_events`, and allow calling this endpoint with the update action to take (`send`/`cancel`/`restart`) in the request path instead of the body. ([\#19152](https://github.com/element-hq/synapse/issues/19152))

## Bugfixes

- Fixed a longstanding bug where background updates were only run on the `main` database. ([\#19181](https://github.com/element-hq/synapse/issues/19181))
- Fixed a bug introduced in v1.142.0 preventing subpaths in MAS endpoints from working. ([\#19186](https://github.com/element-hq/synapse/issues/19186))
- Fix the SQLite-to-PostgreSQL migration script to correctly migrate a boolean column in the `delayed_events` table. ([\#19155](https://github.com/element-hq/synapse/issues/19155))

## Improved Documentation

- Improve documentation around streams, particularly ID generators and adding new streams. ([\#18943](https://github.com/element-hq/synapse/issues/18943))

## Deprecations and Removals

- Remove support for PostgreSQL 13. ([\#19170](https://github.com/element-hq/synapse/issues/19170))

## Internal Changes

- Provide additional servers with federation room directory results. ([\#18970](https://github.com/element-hq/synapse/issues/18970))
- Add a shortcut return when there are no events to purge. ([\#19093](https://github.com/element-hq/synapse/issues/19093))
- Write union types as `X | Y` where possible, as per PEP 604, added in Python 3.10. ([\#19111](https://github.com/element-hq/synapse/issues/19111))
- Reduce cardinality of `synapse_storage_events_persisted_events_sep_total` metric by removing `origin_entity` label. This also separates out events sent by local application services by changing the `origin_type` for such events to `application_service`. The `type` field also only tracks common event types, and anything else is bucketed under `*other*`. ([\#19133](https://github.com/element-hq/synapse/issues/19133), [\#19168](https://github.com/element-hq/synapse/issues/19168))
- Run trial tests on Python 3.14 for PRs. ([\#19135](https://github.com/element-hq/synapse/issues/19135))
- Update `pyproject.toml` project metadata to be compatible with standard Python packaging tooling. ([\#19137](https://github.com/element-hq/synapse/issues/19137))
- Minor speed up of processing of inbound replication. ([\#19138](https://github.com/element-hq/synapse/issues/19138), [\#19145](https://github.com/element-hq/synapse/issues/19145), [\#19146](https://github.com/element-hq/synapse/issues/19146))
- Ignore recent Python language refactors from git blame (`.git-blame-ignore-revs`). ([\#19150](https://github.com/element-hq/synapse/issues/19150))
- Bump lower bounds of dependencies `parameterized` to `0.9.0` and `idna` to `3.3` as those are the first to advertise support for Python 3.10. ([\#19167](https://github.com/element-hq/synapse/issues/19167))
- Point out which event caused the exception when checking [MSC4293](https://github.com/matrix-org/matrix-spec-proposals/pull/4293) redactions. ([\#19169](https://github.com/element-hq/synapse/issues/19169))
- Restore printing `sentinel` for the log record `request` when no logcontext is active. ([\#19172](https://github.com/element-hq/synapse/issues/19172))
- Add debug logs to track `Clock` utilities. ([\#19173](https://github.com/element-hq/synapse/issues/19173))
- Remove explicit python version skips in `cibuildwheel` config as it's no longer required after [#19137](https://github.com/element-hq/synapse/pull/19137). ([\#19177](https://github.com/element-hq/synapse/issues/19177))
- Fix potential lost logcontext when `PerDestinationQueue.shutdown(...)` is called. ([\#19178](https://github.com/element-hq/synapse/issues/19178))
- Fix bad deferred logcontext handling across the codebase. ([\#19180](https://github.com/element-hq/synapse/issues/19180))



### Updates to locked dependencies

* Bump bytes from 1.10.1 to 1.11.0. ([\#19193](https://github.com/element-hq/synapse/issues/19193))
* Bump click from 8.1.8 to 8.3.1. ([\#19195](https://github.com/element-hq/synapse/issues/19195))
* Bump cryptography from 43.0.3 to 45.0.7. ([\#19159](https://github.com/element-hq/synapse/issues/19159))
* Bump docker/metadata-action from 5.8.0 to 5.9.0. ([\#19161](https://github.com/element-hq/synapse/issues/19161))
* Bump pydantic from 2.12.3 to 2.12.4. ([\#19158](https://github.com/element-hq/synapse/issues/19158))
* Bump pyo3-log from 0.13.1 to 0.13.2. ([\#19156](https://github.com/element-hq/synapse/issues/19156))
* Bump ruff from 0.14.3 to 0.14.5. ([\#19196](https://github.com/element-hq/synapse/issues/19196))
* Bump sentry-sdk from 2.34.1 to 2.43.0. ([\#19157](https://github.com/element-hq/synapse/issues/19157))
* Bump sentry-sdk from 2.43.0 to 2.44.0. ([\#19197](https://github.com/element-hq/synapse/issues/19197))
* Bump tomli from 2.2.1 to 2.3.0. ([\#19194](https://github.com/element-hq/synapse/issues/19194))
* Bump types-netaddr from 1.3.0.20240530 to 1.3.0.20251108. ([\#19160](https://github.com/element-hq/synapse/issues/19160))



# Synapse 1.142.1 (2025-11-18)

## Bugfixes

- Fixed a bug introduced in v1.142.0 preventing subpaths in MAS endpoints from working. ([\#19186](https://github.com/element-hq/synapse/issues/19186))




# Synapse 1.142.0 (2025-11-11)

## Dropped support for Python 3.9

This release drops support for Python 3.9, in line with our [dependency
deprecation
policy](https://element-hq.github.io/synapse/latest/deprecation_policy.html#platform-dependencies),
as it is now [end of life](https://endoflife.date/python).

## SQLite 3.40.0+ is now required

The minimum supported SQLite version has been increased from 3.27.0 to 3.40.0.

If you use current versions of the
[matrixorg/synapse](setup/installation.html#docker-images-and-ansible-playbooks)
Docker images, no action is required.


## Deprecation of MacOS Python wheels

The team has decided to deprecate and eventually stop publishing python wheels
for MacOS. This is a burden on the team, and we're not aware of any parties
that use them. Synapse docker images will continue to work on MacOS, as will
building Synapse from source (though note this requires a Rust compiler).

At present, publishing MacOS Python wheels will continue for the next release
(1.143.0), but will not be available after that (1.144.0+). If you do make use
of these wheels downstream, please reach out to us in
[#synapse-dev:matrix.org](https://matrix.to/#/#synapse-dev:matrix.org). We'd
love to hear from you!

## Internal Changes

- Properly stop building wheels for Python 3.9 and free-threaded CPython. ([\#19154](https://github.com/element-hq/synapse/issues/19154))




# Synapse 1.142.0rc4 (2025-11-07)

## Bugfixes

- Fix a bug introduced in 1.142.0rc1 where any attempt to configure `matrix_authentication_service.secret_path` would prevent the homeserver from starting up. ([\#19144](https://github.com/element-hq/synapse/issues/19144))




# Synapse 1.142.0rc3 (2025-11-04)

## Internal Changes

- Update release scripts to prevent building wheels for free-threaded Python, as Synapse does not currently support it. ([\#19140](https://github.com/element-hq/synapse/issues/19140))


# Synapse 1.142.0rc2 (2025-11-04)


## Internal Changes

- Manually skip building Python 3.9 wheels, to prevent errors in the release workflow. ([\#19119](https://github.com/element-hq/synapse/issues/19119))




# Synapse 1.142.0rc1 (2025-11-04)

## Features

- Add support for Python 3.14. ([\#19055](https://github.com/element-hq/synapse/issues/19055), [\#19134](https://github.com/element-hq/synapse/issues/19134))
- Add an [Admin API](https://element-hq.github.io/synapse/latest/usage/administration/admin_api/index.html)
  to allow an admin to fetch the space/room hierarchy for a given space. ([\#19021](https://github.com/element-hq/synapse/issues/19021))

## Bugfixes

- Fix a bug introduced in 1.111.0 where failed attempts to download authenticated remote media would not be handled correctly. ([\#19062](https://github.com/element-hq/synapse/issues/19062))
- Update the `oidc_session_no_samesite` cookie to have the `Secure` attribute, so the only difference between it and the paired `oidc_session` cookie, is the configuration of the `SameSite` attribute as described in the comments / cookie names. Contributed by @kieranlane. ([\#19079](https://github.com/element-hq/synapse/issues/19079))
- Fix a bug introduced in 1.140.0 where lost logcontext warnings would be emitted from timeouts in sync and requests made by Synapse itself. ([\#19090](https://github.com/element-hq/synapse/issues/19090))
- Fix a bug introdued in 1.140.0 where lost logcontext warning were emitted when using `HomeServer.shutdown()`. ([\#19108](https://github.com/element-hq/synapse/issues/19108))

## Improved Documentation

- Update the link to the Debian oldstable package for SQLite. ([\#19047](https://github.com/element-hq/synapse/issues/19047))
- Point out additional Redis configuration options available in the worker docs. Contributed by @servisbryce. ([\#19073](https://github.com/element-hq/synapse/issues/19073))
- Update the list of Debian releases that the downstream Debian package is maintained for. ([\#19100](https://github.com/element-hq/synapse/issues/19100))
- Add [a page](https://element-hq.github.io/synapse/latest/development/internal_documentation/release_notes_review_checklist.html) to the documentation describing the steps the Synapse team takes to review the release notes before publishing them. ([\#19109](https://github.com/element-hq/synapse/issues/19109))

## Deprecations and Removals

- Drop support for Python 3.9. ([\#19099](https://github.com/element-hq/synapse/issues/19099))
- Remove support for SQLite < 3.37.2. ([\#19047](https://github.com/element-hq/synapse/issues/19047))

## Internal Changes

- Fix CI linter for schema delta files to correctly handle all types of `CREATE TABLE` syntax. ([\#19020](https://github.com/element-hq/synapse/issues/19020))
- Use type hinting generics in standard collections, as per [PEP 585](https://peps.python.org/pep-0585/), added in Python 3.9. ([\#19046](https://github.com/element-hq/synapse/issues/19046))
- Always treat `RETURNING` as supported by SQL engines, now that the minimum-supported versions of both SQLite and PostgreSQL support it. ([\#19047](https://github.com/element-hq/synapse/issues/19047))
- Move `oidc.load_metadata()` startup into `_base.start()`. ([\#19056](https://github.com/element-hq/synapse/issues/19056))
- Remove logcontext problems caused by awaiting raw `deferLater(...)`. ([\#19058](https://github.com/element-hq/synapse/issues/19058))
- Prevent duplicate logging setup when running multiple Synapse instances. ([\#19067](https://github.com/element-hq/synapse/issues/19067))
- Be mindful of other logging context filters in 3rd-party code and avoid overwriting log record fields unless we know the log record is relevant to Synapse. ([\#19068](https://github.com/element-hq/synapse/issues/19068))
- Update pydantic to v2. ([\#19071](https://github.com/element-hq/synapse/issues/19071))
- Update deprecated code in the release script to prevent a warning message from being printed. ([\#19080](https://github.com/element-hq/synapse/issues/19080))
- Update the deprecated poetry development dependencies group name in `pyproject.toml`. ([\#19081](https://github.com/element-hq/synapse/issues/19081))
- Remove `pp38*` skip selector from cibuildwheel to silence warning. ([\#19085](https://github.com/element-hq/synapse/issues/19085))
- Don't immediately exit the release script if the checkout is dirty. Instead, allow the user to clear the dirty changes and retry. ([\#19088](https://github.com/element-hq/synapse/issues/19088))
- Update the release script's generated announcement text to include a title and extra text for RC's. ([\#19089](https://github.com/element-hq/synapse/issues/19089))
- Fix lints on main branch. ([\#19092](https://github.com/element-hq/synapse/issues/19092))
- Use cheaper random string function in logcontext utilities. ([\#19094](https://github.com/element-hq/synapse/issues/19094))
- Avoid clobbering other `SIGHUP` handlers in 3rd-party code. ([\#19095](https://github.com/element-hq/synapse/issues/19095))
- Prevent duplicate GitHub draft releases being created during the Synapse release process. ([\#19096](https://github.com/element-hq/synapse/issues/19096))
- Use Pillow's `Image.getexif` method instead of the experimental `Image._getexif`. ([\#19098](https://github.com/element-hq/synapse/issues/19098))
- Prevent uv `/usr/local/.lock` file from appearing in built Synapse docker images. ([\#19107](https://github.com/element-hq/synapse/issues/19107))
- Allow Synapse's runtime dependency checking code to take packaging markers (i.e. `python <= 3.14`) into account when checking dependencies. ([\#19110](https://github.com/element-hq/synapse/issues/19110))
- Move exception handling up the stack (avoid `exit(1)` in our composable functions). ([\#19116](https://github.com/element-hq/synapse/issues/19116))
- Fix a lint error related to lifetimes in Rust 1.90. ([\#19118](https://github.com/element-hq/synapse/issues/19118))
- Refactor and align app entrypoints (avoid `exit(1)` in our composable functions). ([\#19121](https://github.com/element-hq/synapse/issues/19121), [\#19131](https://github.com/element-hq/synapse/issues/19131))
- Speed up pruning of ratelimiters. ([\#19129](https://github.com/element-hq/synapse/issues/19129))



### Updates to locked dependencies

* Bump actions/download-artifact from 5.0.0 to 6.0.0. ([\#19102](https://github.com/element-hq/synapse/issues/19102))
* Bump actions/upload-artifact from 4 to 5. ([\#19106](https://github.com/element-hq/synapse/issues/19106))
* Bump hiredis from 3.2.1 to 3.3.0. ([\#19103](https://github.com/element-hq/synapse/issues/19103))
* Bump icu_segmenter from 2.0.0 to 2.0.1. ([\#19126](https://github.com/element-hq/synapse/issues/19126))
* Bump idna from 3.10 to 3.11. ([\#19053](https://github.com/element-hq/synapse/issues/19053))
* Bump ijson from 3.4.0 to 3.4.0.post0. ([\#19051](https://github.com/element-hq/synapse/issues/19051))
* Bump markdown-it-py from 3.0.0 to 4.0.0. ([\#19123](https://github.com/element-hq/synapse/issues/19123))
* Bump msgpack from 1.1.1 to 1.1.2. ([\#19050](https://github.com/element-hq/synapse/issues/19050))
* Bump psycopg2 from 2.9.10 to 2.9.11. ([\#19125](https://github.com/element-hq/synapse/issues/19125))
* Bump pyyaml from 6.0.2 to 6.0.3. ([\#19105](https://github.com/element-hq/synapse/issues/19105))
* Bump regex from 1.11.3 to 1.12.2. ([\#19074](https://github.com/element-hq/synapse/issues/19074))
* Bump reqwest from 0.12.23 to 0.12.24. ([\#19077](https://github.com/element-hq/synapse/issues/19077))
* Bump ruff from 0.12.10 to 0.14.3. ([\#19124](https://github.com/element-hq/synapse/issues/19124))
* Bump sigstore/cosign-installer from 3.10.0 to 4.0.0. ([\#19075](https://github.com/element-hq/synapse/issues/19075))
* Bump stefanzweifel/git-auto-commit-action from 6.0.1 to 7.0.0. ([\#19052](https://github.com/element-hq/synapse/issues/19052))
* Bump tokio from 1.47.1 to 1.48.0. ([\#19076](https://github.com/element-hq/synapse/issues/19076))
* Bump types-psycopg2 from 2.9.21.20250915 to 2.9.21.20251012. ([\#19054](https://github.com/element-hq/synapse/issues/19054))

# Synapse 1.141.0 (2025-10-29)

## Deprecation of MacOS Python wheels

The team has decided to deprecate and eventually stop publishing python wheels
for MacOS. This is a burden on the team, and we're not aware of any parties
that use them. Synapse docker images will continue to work on MacOS, as will
building Synapse from source (though note this requires a Rust compiler).

Publishing MacOS Python wheels will continue for the next few releases. If you
do make use of these wheels downstream, please reach out to us in
[#synapse-dev:matrix.org](https://matrix.to/#/#synapse-dev:matrix.org). We'd
love to hear from you!


## Docker images now based on Debian `trixie` with Python 3.13

The Docker images are now based on Debian `trixie` and use Python 3.13. If you
are using the Docker images as a base image you may need to e.g. adjust the
paths you mount any additional Python packages at.

No significant changes since 1.141.0rc2.




# Synapse 1.141.0rc2 (2025-10-28)

## Bugfixes

- Fix users being unable to log in if their password, or the server's configured pepper, was too long. ([\#19101](https://github.com/element-hq/synapse/issues/19101))




# Synapse 1.141.0rc1 (2025-10-21)

## Features

- Allow using [MSC4190](https://github.com/matrix-org/matrix-spec-proposals/pull/4190) behavior without the opt-in registration flag. Contributed by @tulir @ Beeper. ([\#19031](https://github.com/element-hq/synapse/issues/19031))
- Stabilized support for [MSC4326](https://github.com/matrix-org/matrix-spec-proposals/pull/4326): Device masquerading for appservices. Contributed by @tulir @ Beeper. ([\#19033](https://github.com/element-hq/synapse/issues/19033))

## Bugfixes

- Fix a bug introduced in 1.136.0 that would prevent Synapse from being able to be `reload`-ed more than once when running under systemd. ([\#19060](https://github.com/element-hq/synapse/issues/19060))
- Fix a bug introduced in 1.140.0 where an internal server error could be raised when hashing user passwords that are too long. ([\#19078](https://github.com/element-hq/synapse/issues/19078))

## Updates to the Docker image

- Update docker image to use Debian trixie as the base and thus Python 3.13. ([\#19064](https://github.com/element-hq/synapse/issues/19064))

## Internal Changes

- Move unique snowflake homeserver background tasks to `start_background_tasks` (the standard pattern for this kind of thing). ([\#19037](https://github.com/element-hq/synapse/issues/19037))
- Drop a deprecated field of the `PyGitHub` dependency in the release script and raise the dependency's minimum version to `1.59.0`. ([\#19039](https://github.com/element-hq/synapse/issues/19039))
- Update TODO list of conflicting areas where we encounter metrics being clobbered (`ApplicationService`). ([\#19040](https://github.com/element-hq/synapse/issues/19040))




# Synapse 1.140.0 (2025-10-14)

## Compatibility notice for users of `synapse-s3-storage-provider`

Deployments that make use of the
[synapse-s3-storage-provider](https://github.com/matrix-org/synapse-s3-storage-provider)
module must upgrade to
[v1.6.0](https://github.com/matrix-org/synapse-s3-storage-provider/releases/tag/v1.6.0).
Using older versions of the module with this release of Synapse will prevent
users from being able to upload or download media.


No significant changes since 1.140.0rc1.




# Synapse 1.140.0rc1 (2025-10-10)

## Features

- Add [a new Media Query by ID Admin API](https://element-hq.github.io/synapse/v1.140/admin_api/media_admin_api.html#query-a-piece-of-media-by-id) that allows server admins to query and investigate the metadata of local or cached remote media via
  the `origin/media_id` identifier found in a [Matrix Content URI](https://spec.matrix.org/v1.14/client-server-api/#matrix-content-mxc-uris). ([\#18911](https://github.com/element-hq/synapse/issues/18911))
- Add [a new Fetch Event Admin API](https://element-hq.github.io/synapse/v1.140/admin_api/fetch_event.html) to fetch an event by ID. ([\#18963](https://github.com/element-hq/synapse/issues/18963))
- Update [MSC4284: Policy Servers](https://github.com/matrix-org/matrix-spec-proposals/pull/4284) implementation to support signatures when available. ([\#18934](https://github.com/element-hq/synapse/issues/18934))
- Add experimental implementation of the `GET /_matrix/client/v1/rtc/transports` endpoint for the latest draft of [MSC4143: MatrixRTC](https://github.com/matrix-org/matrix-spec-proposals/pull/4143). ([\#18967](https://github.com/element-hq/synapse/issues/18967))
- Expose a `defer_to_threadpool` function in the Synapse Module API that allows modules to run a function on a separate thread in a custom threadpool. ([\#19032](https://github.com/element-hq/synapse/issues/19032))

## Bugfixes

- Fix room upgrade `room_config` argument and documentation for `user_may_create_room` spam-checker callback. ([\#18721](https://github.com/element-hq/synapse/issues/18721))
- Compute a user's last seen timestamp from their devices' last seen timestamps instead of IPs, because the latter are automatically cleared according to `user_ips_max_age`. ([\#18948](https://github.com/element-hq/synapse/issues/18948))
- Fix bug where ephemeral events were not filtered by room ID. Contributed by @frastefanini. ([\#19002](https://github.com/element-hq/synapse/issues/19002))
- Update Synapse main process version string to include git info. ([\#19011](https://github.com/element-hq/synapse/issues/19011))

## Improved Documentation

- Explain how `Deferred` callbacks interact with logcontexts. ([\#18914](https://github.com/element-hq/synapse/issues/18914))
- Fix documentation for `rc_room_creation` and `rc_reports` to clarify that a `per_user` rate limit is not supported. ([\#18998](https://github.com/element-hq/synapse/issues/18998))

## Deprecations and Removals

- Remove deprecated `LoggingContext.set_current_context`/`LoggingContext.current_context` methods which already have equivalent bare methods in `synapse.logging.context`. ([\#18989](https://github.com/element-hq/synapse/issues/18989))
- Drop support for unstable field names from the long-accepted [MSC2732](https://github.com/matrix-org/matrix-spec-proposals/pull/2732) (Olm fallback keys) proposal. ([\#18996](https://github.com/element-hq/synapse/issues/18996))

## Internal Changes

- Cleanly shutdown `SynapseHomeServer` object, allowing artifacts of embedded small hosts to be properly garbage collected. ([\#18828](https://github.com/element-hq/synapse/issues/18828))
- Update OEmbed providers to use 'X' instead of 'Twitter' in URL previews, following a rebrand. Contributed by @HammyHavoc. ([\#18767](https://github.com/element-hq/synapse/issues/18767))
- Fix `server_name` in logging context for multiple Synapse instances in one process. ([\#18868](https://github.com/element-hq/synapse/issues/18868))
- Wrap the Rust HTTP client with `make_deferred_yieldable` so it follows Synapse logcontext rules. ([\#18903](https://github.com/element-hq/synapse/issues/18903))
- Fix the GitHub Actions workflow that moves issues labeled "X-Needs-Info" to the "Needs info" column on the team's internal triage board. ([\#18913](https://github.com/element-hq/synapse/issues/18913))
- Disconnect background process work from request trace. ([\#18932](https://github.com/element-hq/synapse/issues/18932))
- Reduce overall number of calls to `_get_e2e_cross_signing_signatures_for_devices` by increasing the batch size of devices the query is called with, reducing DB load. ([\#18939](https://github.com/element-hq/synapse/issues/18939))
- Update error code used when an appservice tries to masquerade as an unknown device using [MSC4326](https://github.com/matrix-org/matrix-spec-proposals/pull/4326). Contributed by @tulir @ Beeper. ([\#18947](https://github.com/element-hq/synapse/issues/18947))
- Fix `no active span when trying to log` tracing error on startup (when OpenTracing is enabled). ([\#18959](https://github.com/element-hq/synapse/issues/18959))
- Fix `run_coroutine_in_background(...)` incorrectly handling logcontext. ([\#18964](https://github.com/element-hq/synapse/issues/18964))
- Add debug logs wherever we change current logcontext. ([\#18966](https://github.com/element-hq/synapse/issues/18966))
- Update dockerfile metadata to fix broken link; point to documentation website. ([\#18971](https://github.com/element-hq/synapse/issues/18971))
- Note that the code is additionally licensed under the [Element Commercial license](https://github.com/element-hq/synapse/blob/develop/LICENSE-COMMERCIAL) in SPDX expression field configs. ([\#18973](https://github.com/element-hq/synapse/issues/18973))
- Fix logcontext handling in `timeout_deferred` tests. ([\#18974](https://github.com/element-hq/synapse/issues/18974))
- Remove internal `ReplicationUploadKeysForUserRestServlet` as a follow-up to the work in https://github.com/element-hq/synapse/pull/18581 that moved device changes off the main process. ([\#18988](https://github.com/element-hq/synapse/issues/18988))
- Switch task scheduler from raw logcontext manipulation to using the dedicated logcontext utils. ([\#18990](https://github.com/element-hq/synapse/issues/18990))
- Remove `MockClock()` in tests. ([\#18992](https://github.com/element-hq/synapse/issues/18992))
- Switch back to our own custom `LogContextScopeManager` instead of OpenTracing's `ContextVarsScopeManager` which was causing problems when using the experimental `SYNAPSE_ASYNC_IO_REACTOR` option with tracing enabled. ([\#19007](https://github.com/element-hq/synapse/issues/19007))
- Remove `version_string` argument from `HomeServer` since it's always the same. ([\#19012](https://github.com/element-hq/synapse/issues/19012))
- Remove duplicate call to `hs.start_background_tasks()` introduced from a bad merge. ([\#19013](https://github.com/element-hq/synapse/issues/19013))
- Split homeserver creation (`create_homeserver`) and setup (`setup`). ([\#19015](https://github.com/element-hq/synapse/issues/19015))
- Swap near-end-of-life `macos-13` GitHub Actions runner for the `macos-15-intel` variant. ([\#19025](https://github.com/element-hq/synapse/issues/19025))
- Introduce `RootConfig.validate_config()` which can be subclassed in `HomeServerConfig` to do cross-config class validation. ([\#19027](https://github.com/element-hq/synapse/issues/19027))
- Allow any command of the `release.py` script to accept a `--gh-token` argument. ([\#19035](https://github.com/element-hq/synapse/issues/19035))



### Updates to locked dependencies

* Bump Swatinem/rust-cache from 2.8.0 to 2.8.1. ([\#18949](https://github.com/element-hq/synapse/issues/18949))
* Bump actions/cache from 4.2.4 to 4.3.0. ([\#18983](https://github.com/element-hq/synapse/issues/18983))
* Bump anyhow from 1.0.99 to 1.0.100. ([\#18950](https://github.com/element-hq/synapse/issues/18950))
* Bump authlib from 1.6.3 to 1.6.4. ([\#18957](https://github.com/element-hq/synapse/issues/18957))
* Bump authlib from 1.6.4 to 1.6.5. ([\#19019](https://github.com/element-hq/synapse/issues/19019))
* Bump bcrypt from 4.3.0 to 5.0.0. ([\#18984](https://github.com/element-hq/synapse/issues/18984))
* Bump docker/login-action from 3.5.0 to 3.6.0. ([\#18978](https://github.com/element-hq/synapse/issues/18978))
* Bump lxml from 6.0.0 to 6.0.2. ([\#18979](https://github.com/element-hq/synapse/issues/18979))
* Bump phonenumbers from 9.0.13 to 9.0.14. ([\#18954](https://github.com/element-hq/synapse/issues/18954))
* Bump phonenumbers from 9.0.14 to 9.0.15. ([\#18991](https://github.com/element-hq/synapse/issues/18991))
* Bump prometheus-client from 0.22.1 to 0.23.1. ([\#19016](https://github.com/element-hq/synapse/issues/19016))
* Bump pydantic from 2.11.9 to 2.11.10. ([\#19017](https://github.com/element-hq/synapse/issues/19017))
* Bump pygithub from 2.7.0 to 2.8.1. ([\#18952](https://github.com/element-hq/synapse/issues/18952))
* Bump regex from 1.11.2 to 1.11.3. ([\#18981](https://github.com/element-hq/synapse/issues/18981))
* Bump serde from 1.0.224 to 1.0.226. ([\#18953](https://github.com/element-hq/synapse/issues/18953))
* Bump serde from 1.0.226 to 1.0.228. ([\#18982](https://github.com/element-hq/synapse/issues/18982))
* Bump setuptools-rust from 1.11.1 to 1.12.0. ([\#18980](https://github.com/element-hq/synapse/issues/18980))
* Bump twine from 6.1.0 to 6.2.0. ([\#18985](https://github.com/element-hq/synapse/issues/18985))
* Bump types-pyyaml from 6.0.12.20250809 to 6.0.12.20250915. ([\#19018](https://github.com/element-hq/synapse/issues/19018))
* Bump types-requests from 2.32.4.20250809 to 2.32.4.20250913. ([\#18951](https://github.com/element-hq/synapse/issues/18951))
* Bump typing-extensions from 4.14.1 to 4.15.0. ([\#18956](https://github.com/element-hq/synapse/issues/18956))

# Synapse 1.139.2 (2025-10-07)

## Bugfixes

- Fix a bug introduced in 1.139.1 where a client could receive an Internal Server Error if they set `device_keys: null` in the request to [`POST /_matrix/client/v3/keys/upload`](https://spec.matrix.org/v1.16/client-server-api/#post_matrixclientv3keysupload). ([\#19023](https://github.com/element-hq/synapse/issues/19023))




# Synapse 1.139.1 (2025-10-07)

## Security Fixes

- Fix [CVE-2025-61672](https://www.cve.org/CVERecord?id=CVE-2025-61672) / [GHSA-fh66-fcv5-jjfr](https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr). Lack of validation for device keys in Synapse before 1.139.1 allows an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. ([\#17097](https://github.com/element-hq/synapse/issues/17097))

## Deprecations and Removals

- Drop support for unstable field names from the long-accepted [MSC2732](https://github.com/matrix-org/matrix-spec-proposals/pull/2732) (Olm fallback keys) proposal. This change allows unit tests to pass following the security patch above. ([\#18996](https://github.com/element-hq/synapse/issues/18996))



# Synapse 1.138.4 (2025-10-07)

## Bugfixes

- Fix a bug introduced in 1.138.3 where a client could receive an Internal Server Error if they set `device_keys: null` in the request to [`POST /_matrix/client/v3/keys/upload`](https://spec.matrix.org/v1.16/client-server-api/#post_matrixclientv3keysupload). ([\#19023](https://github.com/element-hq/synapse/issues/19023))




# Synapse 1.138.3 (2025-10-07)

## Security Fixes

- Fix [CVE-2025-61672](https://www.cve.org/CVERecord?id=CVE-2025-61672) / [GHSA-fh66-fcv5-jjfr](https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr). Lack of validation for device keys in Synapse before 1.139.1 allows an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. ([\#17097](https://github.com/element-hq/synapse/issues/17097))

## Deprecations and Removals

- Drop support for unstable field names from the long-accepted [MSC2732](https://github.com/matrix-org/matrix-spec-proposals/pull/2732) (Olm fallback keys) proposal. This change allows unit tests to pass following the security patch above. ([\#18996](https://github.com/element-hq/synapse/issues/18996))

# Synapse 1.139.0 (2025-09-30)

### `/register` requests from old application service implementations may break when using MAS

If you are using Matrix Authentication Service (MAS), as of this release any
Application Services that do not set `inhibit_login=true` when calling `POST
/_matrix/client/v3/register` will receive the error
`IO.ELEMENT.MSC4190.M_APPSERVICE_LOGIN_UNSUPPORTED` in response. Please see [the
upgrade
notes](https://element-hq.github.io/synapse/develop/upgrade.html#register-requests-from-old-application-service-implementations-may-break-when-using-mas)
for more information.

No significant changes since 1.139.0rc3.


# Synapse 1.139.0rc3 (2025-09-25)

## Bugfixes

- Fix a bug introduced in 1.139.0rc1 where `run_coroutine_in_background(...)` incorrectly handled logcontexts, resulting in partially broken logging. ([\#18964](https://github.com/element-hq/synapse/issues/18964))




# Synapse 1.139.0rc2 (2025-09-23)

## Internal Changes

- Drop support for Ubuntu 24.10 Oracular Oriole, and add support for Ubuntu 25.04 Plucky Puffin. This change was applied on top of 1.139.0rc1. ([\#18962](https://github.com/element-hq/synapse/issues/18962))



# Synapse 1.139.0rc1 (2025-09-23)

## Features

- Add experimental support for [MSC4308: Thread Subscriptions extension to Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4308) when [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-spec-proposals/pull/4306) and [MSC4186: Simplified Sliding Sync](https://github.com/matrix-org/matrix-spec-proposals/pull/4186) are enabled. ([\#18695](https://github.com/element-hq/synapse/issues/18695))
- Update push rules for experimental [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-doc/issues/4306) to follow a newer draft. ([\#18846](https://github.com/element-hq/synapse/issues/18846))
- Add `get_media_upload_limits_for_user` and `on_media_upload_limit_exceeded` module API callbacks to the media repository. ([\#18848](https://github.com/element-hq/synapse/issues/18848))
- Support [MSC4169](https://github.com/matrix-org/matrix-spec-proposals/pull/4169) for backwards-compatible redaction sending using the `/send` endpoint. Contributed by @SpiritCroc @ Beeper. ([\#18898](https://github.com/element-hq/synapse/issues/18898))
- Add an in-memory cache to `_get_e2e_cross_signing_signatures_for_devices` to reduce DB load. ([\#18899](https://github.com/element-hq/synapse/issues/18899))
- Update [MSC4190](https://github.com/matrix-org/matrix-spec-proposals/pull/4190) support to return correct errors and allow appservices to reset cross-signing keys without user-interactive authentication. Contributed by @tulir @ Beeper. ([\#18946](https://github.com/element-hq/synapse/issues/18946))

## Bugfixes

- Ensure all PDUs sent via `/send` pass canonical JSON checks. ([\#18641](https://github.com/element-hq/synapse/issues/18641))
- Fix bug where we did not send invite revocations over federation. ([\#18823](https://github.com/element-hq/synapse/issues/18823))
- Fix prefixed support for [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133). ([\#18875](https://github.com/element-hq/synapse/issues/18875))
- Fix open redirect in legacy SSO flow with the `idp` query parameter. ([\#18909](https://github.com/element-hq/synapse/issues/18909))
- Fix a performance regression related to the experimental Delayed Events ([MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140)) feature. ([\#18926](https://github.com/element-hq/synapse/issues/18926))

## Updates to the Docker image

- Suppress "Applying schema" log noise bulk when `SYNAPSE_LOG_TESTING` is set. ([\#18878](https://github.com/element-hq/synapse/issues/18878))

## Improved Documentation

- Clarify Python dependency constraints in our deprecation policy. ([\#18856](https://github.com/element-hq/synapse/issues/18856))
- Clarify necessary `jwt_config` parameter in OIDC documentation for authentik. Contributed by @maxkratz. ([\#18931](https://github.com/element-hq/synapse/issues/18931))

## Deprecations and Removals

- Remove obsolete and experimental `/sync/e2ee` endpoint. ([\#18583](https://github.com/element-hq/synapse/issues/18583))

## Internal Changes

- Fix `LaterGauge` metrics to collect from all servers. ([\#18791](https://github.com/element-hq/synapse/issues/18791))
- Configure Synapse to run [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-spec-proposals/pull/4306) Complement tests. ([\#18819](https://github.com/element-hq/synapse/issues/18819))
- Remove `sentinel` logcontext usage where we log in `setup`, `start` and `exit`. ([\#18870](https://github.com/element-hq/synapse/issues/18870))
- Use the `Enum`'s value for the dictionary key when responding to an admin request for experimental features. ([\#18874](https://github.com/element-hq/synapse/issues/18874))
- Start background tasks after we fork the process (daemonize). ([\#18886](https://github.com/element-hq/synapse/issues/18886))
- Better explain how we manage the logcontext in `run_in_background(...)` and `run_as_background_process(...)`. ([\#18900](https://github.com/element-hq/synapse/issues/18900), [\#18906](https://github.com/element-hq/synapse/issues/18906))
- Remove `sentinel` logcontext usage in `Clock` utilities like `looping_call` and `call_later`. ([\#18907](https://github.com/element-hq/synapse/issues/18907))
- Replace usages of the deprecated `pkg_resources` interface in preparation of setuptools dropping it soon. ([\#18910](https://github.com/element-hq/synapse/issues/18910))
- Split loading config from homeserver `setup`. ([\#18933](https://github.com/element-hq/synapse/issues/18933))
- Fix `run_in_background` not being awaited properly in some tests causing `LoggingContext` problems. ([\#18937](https://github.com/element-hq/synapse/issues/18937))
- Fix `run_as_background_process` not being awaited properly causing `LoggingContext` problems in experimental [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140): Delayed events implementation. ([\#18938](https://github.com/element-hq/synapse/issues/18938))
- Introduce `Clock.call_when_running(...)` to wrap startup code in a logcontext, ensuring we can identify which server generated the logs. ([\#18944](https://github.com/element-hq/synapse/issues/18944))
- Introduce `Clock.add_system_event_trigger(...)` to wrap system event callback code in a logcontext, ensuring we can identify which server generated the logs. ([\#18945](https://github.com/element-hq/synapse/issues/18945))



### Updates to locked dependencies

* Bump actions/setup-go from 5.5.0 to 6.0.0. ([\#18891](https://github.com/element-hq/synapse/issues/18891))
* Bump actions/setup-python from 5.6.0 to 6.0.0. ([\#18890](https://github.com/element-hq/synapse/issues/18890))
* Bump authlib from 1.6.1 to 1.6.3. ([\#18921](https://github.com/element-hq/synapse/issues/18921))
* Bump jsonschema from 4.25.0 to 4.25.1. ([\#18897](https://github.com/element-hq/synapse/issues/18897))
* Bump log from 0.4.27 to 0.4.28. ([\#18892](https://github.com/element-hq/synapse/issues/18892))
* Bump phonenumbers from 9.0.12 to 9.0.13. ([\#18893](https://github.com/element-hq/synapse/issues/18893))
* Bump pydantic from 2.11.7 to 2.11.9. ([\#18922](https://github.com/element-hq/synapse/issues/18922))
* Bump serde from 1.0.219 to 1.0.223. ([\#18920](https://github.com/element-hq/synapse/issues/18920))
* Bump serde_json from 1.0.143 to 1.0.145. ([\#18919](https://github.com/element-hq/synapse/issues/18919))
* Bump sigstore/cosign-installer from 3.9.2 to 3.10.0. ([\#18917](https://github.com/element-hq/synapse/issues/18917))
* Bump towncrier from 24.8.0 to 25.8.0. ([\#18894](https://github.com/element-hq/synapse/issues/18894))
* Bump types-psycopg2 from 2.9.21.20250809 to 2.9.21.20250915. ([\#18918](https://github.com/element-hq/synapse/issues/18918))
* Bump types-requests from 2.32.4.20250611 to 2.32.4.20250809. ([\#18895](https://github.com/element-hq/synapse/issues/18895))
* Bump types-setuptools from 80.9.0.20250809 to 80.9.0.20250822. ([\#18924](https://github.com/element-hq/synapse/issues/18924))

# Synapse 1.138.2 (2025-09-24)

## Internal Changes

- Drop support for Ubuntu 24.10 Oracular Oriole, and add support for Ubuntu 25.04 Plucky Puffin. This change was applied on top of 1.138.1. ([\#18962](https://github.com/element-hq/synapse/issues/18962))



# Synapse 1.138.1 (2025-09-24)

## Bugfixes

- Fix a performance regression related to the experimental Delayed Events ([MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140)) feature. ([\#18926](https://github.com/element-hq/synapse/issues/18926))




# Synapse 1.138.0 (2025-09-09)

No significant changes since 1.138.0rc1.




# Synapse 1.138.0rc1 (2025-09-02)

### Features

- Support for the stable endpoint and scopes of [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) & co. ([\#18549](https://github.com/element-hq/synapse/issues/18549))

### Bugfixes

- Improve database performance of [MSC4293](https://github.com/matrix-org/matrix-spec-proposals/pull/4293) - Redact on Kick/Ban. ([\#18851](https://github.com/element-hq/synapse/issues/18851))
- Do not throw an error when fetching a rejected delayed state event on startup. ([\#18858](https://github.com/element-hq/synapse/issues/18858))

### Improved Documentation

- Fix worker documentation incorrectly indicating all room Admin API requests were capable of being handled by workers. ([\#18853](https://github.com/element-hq/synapse/issues/18853))

### Internal Changes

- Instrument `_ByteProducer` with tracing to measure potential dead time while writing bytes to the request. ([\#18804](https://github.com/element-hq/synapse/issues/18804))
- Switch to OpenTracing's `ContextVarsScopeManager` instead of our own custom `LogContextScopeManager`. ([\#18849](https://github.com/element-hq/synapse/issues/18849))
- Trace how much work is being done while "recursively fetching redactions". ([\#18854](https://github.com/element-hq/synapse/issues/18854))
- Link [upstream Twisted bug](https://github.com/twisted/twisted/issues/12498) tracking the problem that explains why we have to use a `Producer` to write bytes to the request. ([\#18855](https://github.com/element-hq/synapse/issues/18855))
- Introduce `EventPersistencePair` type. ([\#18857](https://github.com/element-hq/synapse/issues/18857))



### Updates to locked dependencies

* Bump actions/add-to-project from c0c5949b017d0d4a39f7ba888255881bdac2a823 to 4515659e2b458b27365e167605ac44f219494b66. ([\#18863](https://github.com/element-hq/synapse/issues/18863))
* Bump actions/checkout from 4.3.0 to 5.0.0. ([\#18834](https://github.com/element-hq/synapse/issues/18834))
* Bump anyhow from 1.0.98 to 1.0.99. ([\#18841](https://github.com/element-hq/synapse/issues/18841))
* Bump docker/login-action from 3.4.0 to 3.5.0. ([\#18835](https://github.com/element-hq/synapse/issues/18835))
* Bump dtolnay/rust-toolchain from b3b07ba8b418998c39fb20f53e8b695cdcc8de1b to e97e2d8cc328f1b50210efc529dca0028893a2d9. ([\#18862](https://github.com/element-hq/synapse/issues/18862))
* Bump phonenumbers from 9.0.11 to 9.0.12. ([\#18837](https://github.com/element-hq/synapse/issues/18837))
* Bump regex from 1.11.1 to 1.11.2. ([\#18864](https://github.com/element-hq/synapse/issues/18864))
* Bump reqwest from 0.12.22 to 0.12.23. ([\#18842](https://github.com/element-hq/synapse/issues/18842))
* Bump ruff from 0.12.7 to 0.12.10. ([\#18865](https://github.com/element-hq/synapse/issues/18865))
* Bump serde_json from 1.0.142 to 1.0.143. ([\#18866](https://github.com/element-hq/synapse/issues/18866))
* Bump types-bleach from 6.2.0.20250514 to 6.2.0.20250809. ([\#18838](https://github.com/element-hq/synapse/issues/18838))
* Bump types-jsonschema from 4.25.0.20250720 to 4.25.1.20250822. ([\#18867](https://github.com/element-hq/synapse/issues/18867))
* Bump types-psycopg2 from 2.9.21.20250718 to 2.9.21.20250809. ([\#18836](https://github.com/element-hq/synapse/issues/18836))

# Synapse 1.137.0 (2025-08-26)

No significant changes since 1.137.0rc1.




# Synapse 1.137.0rc1 (2025-08-19)

### Bugfixes

- Fix a bug which could corrupt auth chains making it impossible to perform state resolution. ([\#18746](https://github.com/element-hq/synapse/issues/18746))
- Fix error message in `register_new_matrix_user` utility script for empty `registration_shared_secret`. ([\#18780](https://github.com/element-hq/synapse/issues/18780))
- Allow enabling [MSC4108](https://github.com/matrix-org/matrix-spec-proposals/pull/4108) when the stable Matrix Authentication Service integration is enabled. ([\#18832](https://github.com/element-hq/synapse/issues/18832))

### Improved Documentation

- Include IPv6 networks in `denied-peer-ips` of coturn setup. Contributed by @litetex. ([\#18781](https://github.com/element-hq/synapse/issues/18781))

### Internal Changes

- Update tests to ensure all database tables are emptied when purging a room. ([\#18794](https://github.com/element-hq/synapse/issues/18794))
- Instrument the `encode_response` part of Sliding Sync requests for more complete traces in Jaeger. ([\#18815](https://github.com/element-hq/synapse/issues/18815))
- Tag Sliding Sync traces when we `wait_for_events`. ([\#18816](https://github.com/element-hq/synapse/issues/18816))
- Fix `portdb` CI by hardcoding the new `pg_dump` restrict key that was added due to [CVE-2025-8714](https://nvd.nist.gov/vuln/detail/cve-2025-8714). ([\#18824](https://github.com/element-hq/synapse/issues/18824))



### Updates to locked dependencies

* Bump actions/add-to-project from 5b1a254a3546aef88e0a7724a77a623fa2e47c36 to 0c37450c4be3b6a7582b2fb013c9ebfd9c8e9300. ([\#18557](https://github.com/element-hq/synapse/issues/18557))
* Bump actions/cache from 4.2.3 to 4.2.4. ([\#18799](https://github.com/element-hq/synapse/issues/18799))
* Bump actions/checkout from 4.2.2 to 4.3.0. ([\#18800](https://github.com/element-hq/synapse/issues/18800))
* Bump actions/download-artifact from 4.3.0 to 5.0.0. ([\#18801](https://github.com/element-hq/synapse/issues/18801))
* Bump docker/metadata-action from 5.7.0 to 5.8.0. ([\#18773](https://github.com/element-hq/synapse/issues/18773))
* Bump mypy from 1.16.1 to 1.17.1. ([\#18775](https://github.com/element-hq/synapse/issues/18775))
* Bump phonenumbers from 9.0.10 to 9.0.11. ([\#18797](https://github.com/element-hq/synapse/issues/18797))
* Bump pygithub from 2.6.1 to 2.7.0. ([\#18779](https://github.com/element-hq/synapse/issues/18779))
* Bump serde_json from 1.0.141 to 1.0.142. ([\#18776](https://github.com/element-hq/synapse/issues/18776))
* Bump slab from 0.4.10 to 0.4.11. ([\#18809](https://github.com/element-hq/synapse/issues/18809))
* Bump tokio from 1.47.0 to 1.47.1. ([\#18774](https://github.com/element-hq/synapse/issues/18774))
* Bump types-pyyaml from 6.0.12.20250516 to 6.0.12.20250809. ([\#18798](https://github.com/element-hq/synapse/issues/18798))
* Bump types-setuptools from 80.9.0.20250529 to 80.9.0.20250809. ([\#18796](https://github.com/element-hq/synapse/issues/18796))

# Synapse 1.136.0 (2025-08-12)

Note: This release includes the security fixes from `1.135.2` and `1.136.0rc2`, detailed below.

### Bugfixes

- Fix bug introduced in 1.135.2 and 1.136.0rc2 where the [Make Room Admin API](https://element-hq.github.io/synapse/latest/admin_api/rooms.html#make-room-admin-api) would not treat a room v12's creator power level as the highest in room. ([\#18805](https://github.com/element-hq/synapse/issues/18805))


# Synapse 1.135.2 (2025-08-11)

This is the Synapse portion of the [Matrix coordinated security release](https://matrix.org/blog/2025/07/security-predisclosure/). This release includes support for [room version](https://spec.matrix.org/v1.15/rooms/) 12 which fixes a number of security vulnerabilities, including [CVE-2025-49090](https://www.cve.org/CVERecord?id=CVE-2025-49090).

The default room version is not changed. Not all clients will support room version 12 immediately, and not all users will be using the latest version of their clients. Large, public rooms are advised to wait a few weeks before upgrading to room version 12 to allow users throughout the Matrix ecosystem to update their clients.

Note: release 1.135.1 was skipped due to issues discovered during the release process.

Two patched Synapse releases are now available:

* `1.135.2`: stable release comprised of `1.135.0` + security patches
    * Upgrade to this release **if you are currently running 1.135.0 or below**.
* `1.136.0rc2`: unstable release candidate comprised of `1.136.0rc1` + security patches.
    * Upgrade to this release **only if you are on 1.136.0rc1**.

### Bugfixes

- Fix invalidation of storage cache that was broken in 1.135.0. ([\#18786](https://github.com/element-hq/synapse/issues/18786))

### Internal Changes

- Add a parameter to `upgrade_rooms(..)` to allow auto join local users. ([\#82](https://github.com/element-hq/synapse/issues/82))
- Speed up upgrading a room with large numbers of banned users. ([\#18574](https://github.com/element-hq/synapse/issues/18574))


# Synapse 1.136.0rc2 (2025-08-11)

- Update MSC4293 redaction logic for room v12. ([\#80](https://github.com/element-hq/synapse/issues/80))

### Internal Changes

- Add a parameter to `upgrade_rooms(..)` to allow auto join local users. ([\#83](https://github.com/element-hq/synapse/issues/83))


# Synapse 1.136.0rc1 (2025-08-05)

Please check [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11360) as this release contains changes to MAS support, metrics labels and the module API which may require your attention when upgrading.

### Features

- Add configurable rate limiting for the creation of rooms. ([\#18514](https://github.com/element-hq/synapse/issues/18514))
- Add support for [MSC4293](https://github.com/matrix-org/matrix-spec-proposals/pull/4293) - Redact on Kick/Ban. ([\#18540](https://github.com/element-hq/synapse/issues/18540))
- When admins enable themselves to see soft-failed events, they will also see if the cause is due to the policy server flagging them as spam via `unsigned`. ([\#18585](https://github.com/element-hq/synapse/issues/18585))
- Add ability to configure forward/outbound proxy via homeserver config instead of environment variables. See `http_proxy`, `https_proxy`, `no_proxy_hosts`. ([\#18686](https://github.com/element-hq/synapse/issues/18686))
- Advertise experimental support for [MSC4306](https://github.com/matrix-org/matrix-spec-proposals/pull/4306) (Thread Subscriptions) through `/_matrix/clients/versions` if enabled. ([\#18722](https://github.com/element-hq/synapse/issues/18722))
- Stabilise support for delegating authentication to [Matrix Authentication Service](https://github.com/element-hq/matrix-authentication-service/). ([\#18759](https://github.com/element-hq/synapse/issues/18759))
- Implement the push rules for experimental [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-doc/issues/4306). ([\#18762](https://github.com/element-hq/synapse/issues/18762))

### Bugfixes

- Allow return code 403 (allowed by C2S Spec since v1.2) when fetching profiles via federation. ([\#18696](https://github.com/element-hq/synapse/issues/18696))
- Register the MSC4306 (Thread Subscriptions) endpoints in the CS API when the experimental feature is enabled. ([\#18726](https://github.com/element-hq/synapse/issues/18726))
- Fix a long-standing bug where suspended users could not have server notices sent to them (a 403 was returned to the admin). ([\#18750](https://github.com/element-hq/synapse/issues/18750))
- Fix an issue that could cause logcontexts to be lost on rate-limited requests. Found by @realtyem. ([\#18763](https://github.com/element-hq/synapse/issues/18763))
- Fix invalidation of storage cache that was broken in 1.135.0. ([\#18786](https://github.com/element-hq/synapse/issues/18786))

### Improved Documentation

- Minor improvements to README. ([\#18700](https://github.com/element-hq/synapse/issues/18700))
- Document that there can be multiple workers handling the `receipts` stream. ([\#18760](https://github.com/element-hq/synapse/issues/18760))
- Improve worker documentation for some device paths. ([\#18761](https://github.com/element-hq/synapse/issues/18761))

### Deprecations and Removals

- Deprecate `run_as_background_process` exported as part of the module API interface in favor of `ModuleApi.run_as_background_process`. See [the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11360) for more information. ([\#18737](https://github.com/element-hq/synapse/issues/18737))

### Internal Changes

- Add debug logging for HMAC digest verification failures when using the admin API to register users. ([\#18474](https://github.com/element-hq/synapse/issues/18474))
- Speed up upgrading a room with large numbers of banned users. ([\#18574](https://github.com/element-hq/synapse/issues/18574))
- Fix config documentation generation script on Windows by enforcing UTF-8. ([\#18580](https://github.com/element-hq/synapse/issues/18580))
- Refactor cache, background process, `Counter`, `LaterGauge`, `GaugeBucketCollector`, `Histogram`, and `Gauge` metrics to be homeserver-scoped. ([\#18656](https://github.com/element-hq/synapse/issues/18656), [\#18714](https://github.com/element-hq/synapse/issues/18714), [\#18715](https://github.com/element-hq/synapse/issues/18715), [\#18724](https://github.com/element-hq/synapse/issues/18724), [\#18753](https://github.com/element-hq/synapse/issues/18753), [\#18725](https://github.com/element-hq/synapse/issues/18725), [\#18670](https://github.com/element-hq/synapse/issues/18670), [\#18748](https://github.com/element-hq/synapse/issues/18748), [\#18751](https://github.com/element-hq/synapse/issues/18751))
- Reduce database usage in Sliding Sync by not querying for background update completion after the update is known to be complete. ([\#18718](https://github.com/element-hq/synapse/issues/18718))
- Improve order of validation and ratelimiting in room creation. ([\#18723](https://github.com/element-hq/synapse/issues/18723))
- Bump minimum version bound on Twisted to 21.2.0. ([\#18727](https://github.com/element-hq/synapse/issues/18727), [\#18729](https://github.com/element-hq/synapse/issues/18729))
- Use `twisted.internet.testing` module in tests instead of deprecated `twisted.test.proto_helpers`. ([\#18728](https://github.com/element-hq/synapse/issues/18728))
- Remove obsolete `/send_event` replication endpoint. ([\#18730](https://github.com/element-hq/synapse/issues/18730))
- Update metrics linting to be able to handle custom metrics. ([\#18733](https://github.com/element-hq/synapse/issues/18733))
- Work around `twisted.protocols.amp.TooLong` error by reducing logging in some tests. ([\#18736](https://github.com/element-hq/synapse/issues/18736))
- Prevent "Move labelled issues to correct projects" GitHub Actions workflow from failing when an issue is already on the project board. ([\#18755](https://github.com/element-hq/synapse/issues/18755))
- Bump minimum supported Rust version (MSRV) to 1.82.0. Missed in [#18553](https://github.com/element-hq/synapse/pull/18553) (released in Synapse 1.134.0). ([\#18757](https://github.com/element-hq/synapse/issues/18757))
- Make `Clock.sleep(...)` return a coroutine, so that mypy can catch places where we don't await on it. ([\#18772](https://github.com/element-hq/synapse/issues/18772))
- Update implementation of [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-doc/issues/4306) to include automatic subscription conflict prevention as introduced in later drafts. ([\#18756](https://github.com/element-hq/synapse/issues/18756))



### Updates to locked dependencies

* Bump gitpython from 3.1.44 to 3.1.45. ([\#18743](https://github.com/element-hq/synapse/issues/18743))
* Bump mypy-zope from 1.0.12 to 1.0.13. ([\#18744](https://github.com/element-hq/synapse/issues/18744))
* Bump phonenumbers from 9.0.9 to 9.0.10. ([\#18741](https://github.com/element-hq/synapse/issues/18741))
* Bump ruff from 0.12.4 to 0.12.5. ([\#18742](https://github.com/element-hq/synapse/issues/18742))
* Bump sentry-sdk from 2.32.0 to 2.33.2. ([\#18745](https://github.com/element-hq/synapse/issues/18745))
* Bump tokio from 1.46.1 to 1.47.0. ([\#18740](https://github.com/element-hq/synapse/issues/18740))
* Bump types-jsonschema from 4.24.0.20250708 to 4.25.0.20250720. ([\#18703](https://github.com/element-hq/synapse/issues/18703))
* Bump types-psycopg2 from 2.9.21.20250516 to 2.9.21.20250718. ([\#18706](https://github.com/element-hq/synapse/issues/18706))

# Synapse 1.135.0 (2025-08-01)

No significant changes since 1.135.0rc2.




# Synapse 1.135.0rc2 (2025-07-30)

### Bugfixes

- Fix user failing to deactivate with MAS when `/_synapse/mas` is handled by a worker. ([\#18716](https://github.com/element-hq/synapse/issues/18716))

### Internal Changes

- Fix performance regression introduced in [#18238](https://github.com/element-hq/synapse/issues/18238) by adding a cache to `is_server_admin`. ([\#18747](https://github.com/element-hq/synapse/issues/18747))




# Synapse 1.135.0rc1 (2025-07-22)

### Features

- Add `recaptcha_private_key_path` and `recaptcha_public_key_path` config option. ([\#17984](https://github.com/element-hq/synapse/issues/17984), [\#18684](https://github.com/element-hq/synapse/issues/18684))
- Add plain-text handling for rich-text topics as per [MSC3765](https://github.com/matrix-org/matrix-spec-proposals/pull/3765). ([\#18195](https://github.com/element-hq/synapse/issues/18195))
- If enabled by the user, server admins will see [soft failed](https://spec.matrix.org/v1.13/server-server-api/#soft-failure) events over the Client-Server API. ([\#18238](https://github.com/element-hq/synapse/issues/18238))
- Add experimental support for [MSC4277: Harmonizing the reporting endpoints](https://github.com/matrix-org/matrix-spec-proposals/pull/4277). ([\#18263](https://github.com/element-hq/synapse/issues/18263))
- Add ability to limit amount of media uploaded by a user in a given time period. ([\#18527](https://github.com/element-hq/synapse/issues/18527))
- Enable workers to write directly to the device lists stream and handle device list updates, reducing load on the main process. ([\#18581](https://github.com/element-hq/synapse/issues/18581))
- Support arbitrary profile fields. Contributed by @clokep. ([\#18635](https://github.com/element-hq/synapse/issues/18635))
- Advertise support for Matrix v1.12. ([\#18647](https://github.com/element-hq/synapse/issues/18647))
- Add an option to issue redactions as an admin user via the [admin redaction endpoint](https://element-hq.github.io/synapse/latest/admin_api/user_admin_api.html#redact-all-the-events-of-a-user). ([\#18671](https://github.com/element-hq/synapse/issues/18671))
- Add experimental and incomplete support for [MSC4306: Thread Subscriptions](https://github.com/matrix-org/matrix-spec-proposals/blob/rei/msc_thread_subscriptions/proposals/4306-thread-subscriptions.md). ([\#18674](https://github.com/element-hq/synapse/issues/18674))
- Include `event_id` when getting state with `?format=event`. Contributed by @tulir @ Beeper. ([\#18675](https://github.com/element-hq/synapse/issues/18675))

### Bugfixes

- Fix CPU and database spinning when retrying sending events to servers whilst at the same time purging those events. ([\#18499](https://github.com/element-hq/synapse/issues/18499))
- Don't allow creation of tags with names longer than 255 bytes, [as per the spec](https://spec.matrix.org/v1.15/client-server-api/#events-14). ([\#18660](https://github.com/element-hq/synapse/issues/18660))
- Fix `sliding_sync_connections`-related errors when porting from SQLite to Postgres. ([\#18677](https://github.com/element-hq/synapse/issues/18677))
- Fix the MAS integration not working when Synapse is started with `--daemonize` or using `synctl`. ([\#18691](https://github.com/element-hq/synapse/issues/18691))

### Improved Documentation

- Document that some config options for the user directory are in violation of the Matrix spec. ([\#18548](https://github.com/element-hq/synapse/issues/18548))
- Update `rc_delayed_event_mgmt` docs to the actual nesting level. Contributed by @HarHarLinks. ([\#18692](https://github.com/element-hq/synapse/issues/18692))

### Internal Changes

- Add a dedicated internal API for Matrix Authentication Service to Synapse communication. ([\#18520](https://github.com/element-hq/synapse/issues/18520))
- Allow user registrations to be done on workers. ([\#18552](https://github.com/element-hq/synapse/issues/18552))
- Remove unnecessary HTTP replication calls. ([\#18564](https://github.com/element-hq/synapse/issues/18564))
- Refactor `Measure` block metrics to be homeserver-scoped. ([\#18601](https://github.com/element-hq/synapse/issues/18601))
- Refactor cache metrics to be homeserver-scoped. ([\#18604](https://github.com/element-hq/synapse/issues/18604))
- Unbreak "Latest dependencies" workflow by using the `--without dev` poetry option instead of removed `--no-dev`. ([\#18617](https://github.com/element-hq/synapse/issues/18617))
- Update URL Preview code to work with `lxml` 6.0.0+. ([\#18622](https://github.com/element-hq/synapse/issues/18622))
- Use `markdown-it-py` instead of `commonmark` in the release script. ([\#18637](https://github.com/element-hq/synapse/issues/18637))
- Fix typing errors with upgraded mypy version. ([\#18653](https://github.com/element-hq/synapse/issues/18653))
- Add doc comment explaining that config files are shallowly merged. ([\#18664](https://github.com/element-hq/synapse/issues/18664))
- Minor speed up of insertion into `stream_positions` table. ([\#18672](https://github.com/element-hq/synapse/issues/18672))
- Remove unused `allow_no_prev_events` option when creating an event. ([\#18676](https://github.com/element-hq/synapse/issues/18676))
- Clean up `MetricsResource` and Prometheus hacks. ([\#18687](https://github.com/element-hq/synapse/issues/18687))
- Fix dirty `Cargo.lock` changes appearing after install (`base64`). ([\#18689](https://github.com/element-hq/synapse/issues/18689))
- Prevent dirty `Cargo.lock` changes from install. ([\#18693](https://github.com/element-hq/synapse/issues/18693))
- Correct spelling of 'Admin token used' log line. ([\#18697](https://github.com/element-hq/synapse/issues/18697))
- Reduce log spam when client stops downloading media while it is being streamed to them. ([\#18699](https://github.com/element-hq/synapse/issues/18699))



### Updates to locked dependencies

* Bump authlib from 1.6.0 to 1.6.1. ([\#18704](https://github.com/element-hq/synapse/issues/18704))
* Bump base64 from 0.21.7 to 0.22.1. ([\#18666](https://github.com/element-hq/synapse/issues/18666))
* Bump jsonschema from 4.24.0 to 4.25.0. ([\#18707](https://github.com/element-hq/synapse/issues/18707))
* Bump lxml from 5.4.0 to 6.0.0. ([\#18631](https://github.com/element-hq/synapse/issues/18631))
* Bump mypy from 1.13.0 to 1.16.1. ([\#18653](https://github.com/element-hq/synapse/issues/18653))
* Bump once_cell from 1.19.0 to 1.21.3. ([\#18710](https://github.com/element-hq/synapse/issues/18710))
* Bump phonenumbers from 9.0.8 to 9.0.9. ([\#18681](https://github.com/element-hq/synapse/issues/18681))
* Bump ruff from 0.12.2 to 0.12.5. ([\#18683](https://github.com/element-hq/synapse/issues/18683), [\#18705](https://github.com/element-hq/synapse/issues/18705))
* Bump serde_json from 1.0.140 to 1.0.141. ([\#18709](https://github.com/element-hq/synapse/issues/18709))
* Bump sigstore/cosign-installer from 3.9.1 to 3.9.2. ([\#18708](https://github.com/element-hq/synapse/issues/18708))
* Bump types-jsonschema from 4.24.0.20250528 to 4.24.0.20250708. ([\#18682](https://github.com/element-hq/synapse/issues/18682))

# Synapse 1.134.0 (2025-07-15)

No significant changes since 1.134.0rc1.




# Synapse 1.134.0rc1 (2025-07-09)

### Features

- Support for [MSC4235](https://github.com/matrix-org/matrix-spec-proposals/pull/4235): `via` query param for hierarchy endpoint. Contributed by Krishan (@kfiven). ([\#18070](https://github.com/element-hq/synapse/issues/18070))
- Add `forget_forced_upon_leave` capability as per [MSC4267](https://github.com/matrix-org/matrix-spec-proposals/pull/4267). ([\#18196](https://github.com/element-hq/synapse/issues/18196))
- Add `federated_user_may_invite` spam checker callback which receives the entire invite event. Contributed by @tulir @ Beeper. ([\#18241](https://github.com/element-hq/synapse/issues/18241))

### Bugfixes

- Fix `KeyError` on background updates when using split main/state databases. ([\#18509](https://github.com/element-hq/synapse/issues/18509))
- Improve performance of device deletion by adding missing index. ([\#18582](https://github.com/element-hq/synapse/issues/18582))
- Fix `avatar_url` and `displayname` being sent on federation profile queries when they are not set. ([\#18593](https://github.com/element-hq/synapse/issues/18593))
- Respond with 401 & `M_USER_LOCKED` when a locked user calls `POST /login`, as per the spec. ([\#18594](https://github.com/element-hq/synapse/issues/18594))
- Ensure policy servers are not asked to scan policy server change events, allowing rooms to disable the use of a policy server while the policy server is down. ([\#18605](https://github.com/element-hq/synapse/issues/18605))

### Improved Documentation

- Fix documentation of the Delete Room Admin API's status field. ([\#18519](https://github.com/element-hq/synapse/issues/18519))

### Deprecations and Removals

- Stop adding the "origin" field to newly-created events (PDUs). ([\#18418](https://github.com/element-hq/synapse/issues/18418))

### Internal Changes

- Replace `PyICU` crate with equivalent `icu_segmenter` Rust crate. ([\#18553](https://github.com/element-hq/synapse/issues/18553), [\#18646](https://github.com/element-hq/synapse/issues/18646))
- Improve docstring on `simple_upsert_many`. ([\#18573](https://github.com/element-hq/synapse/issues/18573))
- Raise poetry-core version cap to 2.1.3. ([\#18575](https://github.com/element-hq/synapse/issues/18575))
- Raise setuptools_rust version cap to 1.11.1. ([\#18576](https://github.com/element-hq/synapse/issues/18576))
- Better handling of ratelimited requests. ([\#18595](https://github.com/element-hq/synapse/issues/18595), [\#18600](https://github.com/element-hq/synapse/issues/18600))
- Update to Rust 1.87.0 in CI, and bump the pinned commit of the `dtolnay/rust-toolchain` GitHub Action to `b3b07ba8b418998c39fb20f53e8b695cdcc8de1b`. ([\#18596](https://github.com/element-hq/synapse/issues/18596))
- Speed up bulk device deletion. ([\#18602](https://github.com/element-hq/synapse/issues/18602))
- Speed up the building of arm-based wheels in CI. ([\#18618](https://github.com/element-hq/synapse/issues/18618))
- Speed up the building of Docker images in CI. ([\#18620](https://github.com/element-hq/synapse/issues/18620))
- Add `.zed/` directory to `.gitignore`. ([\#18623](https://github.com/element-hq/synapse/issues/18623))
- Log the room ID we're purging state for. ([\#18625](https://github.com/element-hq/synapse/issues/18625))



### Updates to locked dependencies

* Bump Swatinem/rust-cache from 2.7.8 to 2.8.0. ([\#18612](https://github.com/element-hq/synapse/issues/18612))
* Bump attrs from 24.2.0 to 25.3.0. ([\#18649](https://github.com/element-hq/synapse/issues/18649))
* Bump authlib from 1.5.2 to 1.6.0. ([\#18642](https://github.com/element-hq/synapse/issues/18642))
* Bump base64 from 0.21.7 to 0.22.1. ([\#18589](https://github.com/element-hq/synapse/issues/18589))
* Bump base64 from 0.21.7 to 0.22.1. ([\#18629](https://github.com/element-hq/synapse/issues/18629))
* Bump docker/build-push-action from 6.17.0 to 6.18.0. ([\#18497](https://github.com/element-hq/synapse/issues/18497))
* Bump docker/setup-buildx-action from 3.10.0 to 3.11.1. ([\#18587](https://github.com/element-hq/synapse/issues/18587))
* Bump hiredis from 3.1.0 to 3.2.1. ([\#18638](https://github.com/element-hq/synapse/issues/18638))
* Bump ijson from 3.3.0 to 3.4.0. ([\#18650](https://github.com/element-hq/synapse/issues/18650))
* Bump jsonschema from 4.23.0 to 4.24.0. ([\#18630](https://github.com/element-hq/synapse/issues/18630))
* Bump msgpack from 1.1.0 to 1.1.1. ([\#18651](https://github.com/element-hq/synapse/issues/18651))
* Bump mypy-zope from 1.0.11 to 1.0.12. ([\#18640](https://github.com/element-hq/synapse/issues/18640))
* Bump phonenumbers from 9.0.2 to 9.0.8. ([\#18652](https://github.com/element-hq/synapse/issues/18652))
* Bump pillow from 11.2.1 to 11.3.0. ([\#18624](https://github.com/element-hq/synapse/issues/18624))
* Bump prometheus-client from 0.21.0 to 0.22.1. ([\#18609](https://github.com/element-hq/synapse/issues/18609))
* Bump pyasn1-modules from 0.4.1 to 0.4.2. ([\#18495](https://github.com/element-hq/synapse/issues/18495))
* Bump pydantic from 2.11.4 to 2.11.7. ([\#18639](https://github.com/element-hq/synapse/issues/18639))
* Bump reqwest from 0.12.15 to 0.12.20. ([\#18590](https://github.com/element-hq/synapse/issues/18590))
* Bump reqwest from 0.12.20 to 0.12.22. ([\#18627](https://github.com/element-hq/synapse/issues/18627))
* Bump ruff from 0.11.11 to 0.12.1. ([\#18645](https://github.com/element-hq/synapse/issues/18645))
* Bump ruff from 0.12.1 to 0.12.2. ([\#18657](https://github.com/element-hq/synapse/issues/18657))
* Bump sentry-sdk from 2.22.0 to 2.32.0. ([\#18633](https://github.com/element-hq/synapse/issues/18633))
* Bump setuptools-rust from 1.10.2 to 1.11.1. ([\#18655](https://github.com/element-hq/synapse/issues/18655))
* Bump sigstore/cosign-installer from 3.8.2 to 3.9.0. ([\#18588](https://github.com/element-hq/synapse/issues/18588))
* Bump sigstore/cosign-installer from 3.9.0 to 3.9.1. ([\#18608](https://github.com/element-hq/synapse/issues/18608))
* Bump stefanzweifel/git-auto-commit-action from 5.2.0 to 6.0.1. ([\#18607](https://github.com/element-hq/synapse/issues/18607))
* Bump tokio from 1.45.1 to 1.46.0. ([\#18628](https://github.com/element-hq/synapse/issues/18628))
* Bump tokio from 1.46.0 to 1.46.1. ([\#18667](https://github.com/element-hq/synapse/issues/18667))
* Bump treq from 24.9.1 to 25.5.0. ([\#18610](https://github.com/element-hq/synapse/issues/18610))
* Bump types-bleach from 6.2.0.20241123 to 6.2.0.20250514. ([\#18634](https://github.com/element-hq/synapse/issues/18634))
* Bump types-jsonschema from 4.23.0.20250516 to 4.24.0.20250528. ([\#18611](https://github.com/element-hq/synapse/issues/18611))
* Bump types-opentracing from 2.4.10.6 to 2.4.10.20250622. ([\#18586](https://github.com/element-hq/synapse/issues/18586))
* Bump types-psycopg2 from 2.9.21.20250318 to 2.9.21.20250516. ([\#18658](https://github.com/element-hq/synapse/issues/18658))
* Bump types-pyyaml from 6.0.12.20241230 to 6.0.12.20250516. ([\#18643](https://github.com/element-hq/synapse/issues/18643))
* Bump types-setuptools from 75.2.0.20241019 to 80.9.0.20250529. ([\#18644](https://github.com/element-hq/synapse/issues/18644))
* Bump typing-extensions from 4.12.2 to 4.14.0. ([\#18654](https://github.com/element-hq/synapse/issues/18654))
* Bump typing-extensions from 4.14.0 to 4.14.1. ([\#18668](https://github.com/element-hq/synapse/issues/18668))
* Bump urllib3 from 2.2.2 to 2.5.0. ([\#18572](https://github.com/element-hq/synapse/issues/18572))

# Synapse 1.133.0 (2025-07-01)

Pre-built wheels are now built using the [manylinux_2_28](https://github.com/pypa/manylinux#manylinux_2_28-almalinux-8-based) base, which is expected to be compatible with distros using glibc 2.28 or later, including:

 - Debian 10+
 - Ubuntu 18.10+
 - Fedora 29+
 - CentOS/RHEL 8+

Previously, wheels were built using the [manylinux2014](https://github.com/pypa/manylinux#manylinux2014-centos-7-based-glibc-217) base, which was expected to be compatible with distros using glibc 2.17 or later.

### Bugfixes

- Bump `cibuildwheel` to 3.0.0 to fix the `manylinux` wheel builds. ([\#18615](https://github.com/element-hq/synapse/issues/18615))




# Synapse 1.133.0rc1 (2025-06-24)

### Features

- Add support for the [MSC4260 user report API](https://github.com/matrix-org/matrix-spec-proposals/pull/4260). ([\#18120](https://github.com/element-hq/synapse/issues/18120))

### Bugfixes

- Fix an issue where, during state resolution for v11 rooms, Synapse would incorrectly calculate the power level of the creator when there was no power levels event in the room. ([\#18534](https://github.com/element-hq/synapse/issues/18534), [\#18547](https://github.com/element-hq/synapse/issues/18547))
- Fix long-standing bug where sliding sync did not honour the `room_id_to_include` config option. ([\#18535](https://github.com/element-hq/synapse/issues/18535))
- Fix an issue where "Lock timeout is getting excessive" warnings would be logged even when the lock timeout was <10 minutes. ([\#18543](https://github.com/element-hq/synapse/issues/18543))
- Fix an issue where Synapse could calculate the wrong power level for the creator of the room if there was no power levels event. ([\#18545](https://github.com/element-hq/synapse/issues/18545))

### Improved Documentation

- Generate config documentation from JSON Schema file. ([\#18528](https://github.com/element-hq/synapse/issues/18528))
- Fix typo in user type documentation. ([\#18568](https://github.com/element-hq/synapse/issues/18568))

### Internal Changes

- Increase performance of introspecting access tokens when using delegated auth. ([\#18357](https://github.com/element-hq/synapse/issues/18357), [\#18561](https://github.com/element-hq/synapse/issues/18561))
- Log user deactivations. ([\#18541](https://github.com/element-hq/synapse/issues/18541))
- Enable [`flake8-logging`](https://docs.astral.sh/ruff/rules/#flake8-logging-log) and [`flake8-logging-format`](https://docs.astral.sh/ruff/rules/#flake8-logging-format-g) rules in Ruff and fix related issues throughout the codebase. ([\#18542](https://github.com/element-hq/synapse/issues/18542))
- Clean up old, unused rows from the `device_federation_inbox` table. ([\#18546](https://github.com/element-hq/synapse/issues/18546))
- Run config schema CI on develop and release branches. ([\#18551](https://github.com/element-hq/synapse/issues/18551))
- Add support for Twisted `25.5.0`+ releases. ([\#18577](https://github.com/element-hq/synapse/issues/18577))
- Update PyO3 to version 0.25. ([\#18578](https://github.com/element-hq/synapse/issues/18578))



### Updates to locked dependencies

* Bump actions/setup-python from 5.5.0 to 5.6.0. ([\#18555](https://github.com/element-hq/synapse/issues/18555))
* Bump base64 from 0.21.7 to 0.22.1. ([\#18559](https://github.com/element-hq/synapse/issues/18559))
* Bump dawidd6/action-download-artifact from 9 to 11. ([\#18556](https://github.com/element-hq/synapse/issues/18556))
* Bump headers from 0.4.0 to 0.4.1. ([\#18529](https://github.com/element-hq/synapse/issues/18529))
* Bump requests from 2.32.2 to 2.32.4. ([\#18533](https://github.com/element-hq/synapse/issues/18533))
* Bump types-requests from 2.32.0.20250328 to 2.32.4.20250611. ([\#18558](https://github.com/element-hq/synapse/issues/18558))

# Synapse 1.132.0 (2025-06-17)

### Improved Documentation

- Improvements to generate config documentation from JSON Schema file. ([\#18522](https://github.com/element-hq/synapse/issues/18522))




# Synapse 1.132.0rc1 (2025-06-10)

### Features

- Add support for [MSC4155](https://github.com/matrix-org/matrix-spec-proposals/pull/4155) Invite Filtering. ([\#18288](https://github.com/element-hq/synapse/issues/18288))
- Add experimental `user_may_send_state_event` module API callback. ([\#18455](https://github.com/element-hq/synapse/issues/18455))
- Add experimental `get_media_config_for_user` and `is_user_allowed_to_upload_media_of_size` module API callbacks that allow overriding of media repository maximum upload size. ([\#18457](https://github.com/element-hq/synapse/issues/18457))
- Add experimental `get_ratelimit_override_for_user` module API callback that allows overriding of per-user ratelimits. ([\#18458](https://github.com/element-hq/synapse/issues/18458))
- Pass `room_config` argument to `user_may_create_room` spam checker module callback. ([\#18486](https://github.com/element-hq/synapse/issues/18486))
- Support configuration of default and extra user types. ([\#18456](https://github.com/element-hq/synapse/issues/18456))
- Successful requests to `/_matrix/app/v1/ping` will now force Synapse to reattempt delivering transactions to appservices. ([\#18521](https://github.com/element-hq/synapse/issues/18521))
- Support the import of the `RatelimitOverride` type from `synapse.module_api` in modules and rename `messages_per_second` to `per_second`. ([\#18513](https://github.com/element-hq/synapse/issues/18513))

### Bugfixes

- Remove destinations from sending if not whitelisted. ([\#18484](https://github.com/element-hq/synapse/issues/18484))
- Fixed room summary API incorrectly returning that a room is private in the room summary response when the join rule is omitted by the remote server. Contributed by @nexy7574. ([\#18493](https://github.com/element-hq/synapse/issues/18493))
- Prevent users from adding themselves to their own user ignore list. ([\#18508](https://github.com/element-hq/synapse/issues/18508))

### Improved Documentation

- Generate config documentation from JSON Schema file. ([\#17892](https://github.com/element-hq/synapse/issues/17892))
- Mention `CAP_NET_BIND_SERVICE` as an alternative to running Synapse as root in order to bind to a privileged port. ([\#18408](https://github.com/element-hq/synapse/issues/18408))
- Surface hidden Admin API documentation regarding fetching of scheduled tasks. ([\#18516](https://github.com/element-hq/synapse/issues/18516))
- Mark the new module APIs in this release as experimental. ([\#18536](https://github.com/element-hq/synapse/issues/18536))

### Internal Changes

- Mark dehydrated devices in the [List All User Devices Admin API](https://element-hq.github.io/synapse/latest/admin_api/user_admin_api.html#list-all-devices). ([\#18252](https://github.com/element-hq/synapse/issues/18252))
- Reduce disk wastage by cleaning up `received_transactions` older than 1 day, rather than 30 days. ([\#18310](https://github.com/element-hq/synapse/issues/18310))
- Distinguish all vs local events being persisted in the "Event Send Time Quantiles" graph (Grafana). ([\#18510](https://github.com/element-hq/synapse/issues/18510))




# Synapse 1.131.0 (2025-06-03)

No significant changes since 1.131.0rc1.

# Synapse 1.131.0rc1 (2025-05-28)

### Features

- Add `msc4263_limit_key_queries_to_users_who_share_rooms` config option as per [MSC4263](https://github.com/matrix-org/matrix-spec-proposals/pull/4263). ([\#18180](https://github.com/element-hq/synapse/issues/18180))
- Add option to allow registrations that begin with `_`. Contributed by `_` (@hex5f). ([\#18262](https://github.com/element-hq/synapse/issues/18262))
- Include room ID in response to the [Room Deletion Status Admin API](https://element-hq.github.io/synapse/latest/admin_api/rooms.html#status-of-deleting-rooms). ([\#18318](https://github.com/element-hq/synapse/issues/18318))
- Add support for calling Policy Servers ([MSC4284](https://github.com/matrix-org/matrix-spec-proposals/pull/4284)) to mark events as spam. ([\#18387](https://github.com/element-hq/synapse/issues/18387))

### Bugfixes

- Prevent race-condition in `_maybe_retry_device_resync` entrance. ([\#18391](https://github.com/element-hq/synapse/issues/18391))
- Fix the `tests.handlers.test_worker_lock.WorkerLockTestCase.test_lock_contention` test which could spuriously time out on RISC-V architectures due to performance differences. ([\#18430](https://github.com/element-hq/synapse/issues/18430))
- Fix admin redaction endpoint not redacting encrypted messages. ([\#18434](https://github.com/element-hq/synapse/issues/18434))

### Improved Documentation

- Update `room_list_publication_rules` docs to consider defaults that changed in v1.126.0. Contributed by @HarHarLinks. ([\#18286](https://github.com/element-hq/synapse/issues/18286))
- Add advice for upgrading between major PostgreSQL versions to the database documentation. ([\#18445](https://github.com/element-hq/synapse/issues/18445))

### Internal Changes

- Fix a memory leak in `_NotifierUserStream`. ([\#18380](https://github.com/element-hq/synapse/issues/18380))
- Fix a couple type annotations in the `RootConfig`/`Config`. ([\#18409](https://github.com/element-hq/synapse/issues/18409))
- Explicitly enable PyPy builds in `cibuildwheel`s config to avoid it being disabled on a future upgrade to `cibuildwheel` v3. ([\#18417](https://github.com/element-hq/synapse/issues/18417))
- Update the PR review template to remove an erroneous line break from the final bullet point. ([\#18419](https://github.com/element-hq/synapse/issues/18419))
- Explain why we `flush_buffer()` for Python `print(...)` output. ([\#18420](https://github.com/element-hq/synapse/issues/18420))
- Add lint to ensure we don't add a `CREATE/DROP INDEX` in a schema delta. ([\#18440](https://github.com/element-hq/synapse/issues/18440))
- Allow checking only for the existence of a field in an SSO provider's response, rather than requiring the value(s) to check. ([\#18454](https://github.com/element-hq/synapse/issues/18454))
- Add unit tests for homeserver usage statistics. ([\#18463](https://github.com/element-hq/synapse/issues/18463))
- Don't move invited users to new room when shutting down room. ([\#18471](https://github.com/element-hq/synapse/issues/18471))



### Updates to locked dependencies

* Bump actions/setup-python from 5.5.0 to 5.6.0. ([\#18398](https://github.com/element-hq/synapse/issues/18398))
* Bump authlib from 1.5.1 to 1.5.2. ([\#18452](https://github.com/element-hq/synapse/issues/18452))
* Bump docker/build-push-action from 6.15.0 to 6.17.0. ([\#18397](https://github.com/element-hq/synapse/issues/18397), [\#18449](https://github.com/element-hq/synapse/issues/18449))
* Bump lxml from 5.3.0 to 5.4.0. ([\#18480](https://github.com/element-hq/synapse/issues/18480))
* Bump mypy-zope from 1.0.9 to 1.0.11. ([\#18428](https://github.com/element-hq/synapse/issues/18428))
* Bump pyo3 from 0.23.5 to 0.24.2. ([\#18460](https://github.com/element-hq/synapse/issues/18460))
* Bump pyo3-log from 0.12.3 to 0.12.4. ([\#18453](https://github.com/element-hq/synapse/issues/18453))
* Bump pyopenssl from 25.0.0 to 25.1.0. ([\#18450](https://github.com/element-hq/synapse/issues/18450))
* Bump ruff from 0.7.3 to 0.11.11. ([\#18451](https://github.com/element-hq/synapse/issues/18451), [\#18482](https://github.com/element-hq/synapse/issues/18482))
* Bump tornado from 6.4.2 to 6.5.0. ([\#18459](https://github.com/element-hq/synapse/issues/18459))
* Bump setuptools from 72.1.0 to 78.1.1. ([\#18461](https://github.com/element-hq/synapse/issues/18461))
* Bump types-jsonschema from 4.23.0.20241208 to 4.23.0.20250516. ([\#18481](https://github.com/element-hq/synapse/issues/18481))
* Bump types-requests from 2.32.0.20241016 to 2.32.0.20250328. ([\#18427](https://github.com/element-hq/synapse/issues/18427))

# Synapse 1.130.0 (2025-05-20)

### Bugfixes

- Fix startup being blocked on creating a new index that was introduced in v1.130.0rc1. ([\#18439](https://github.com/element-hq/synapse/issues/18439))
- Fix the ordering of local messages in rooms that were affected by [GHSA-v56r-hwv5-mxg6](https://github.com/advisories/GHSA-v56r-hwv5-mxg6). ([\#18447](https://github.com/element-hq/synapse/issues/18447))




# Synapse 1.130.0rc1 (2025-05-13)

### Features

- Add an Admin API endpoint `GET /_synapse/admin/v1/scheduled_tasks`  to fetch scheduled tasks. ([\#18214](https://github.com/element-hq/synapse/issues/18214))
- Add config option `user_directory.exclude_remote_users` which, when enabled, excludes remote users from user directory search results. ([\#18300](https://github.com/element-hq/synapse/issues/18300))
- Add support for handling `GET /devices/` on workers. ([\#18355](https://github.com/element-hq/synapse/issues/18355))

### Bugfixes

- Fix a longstanding bug where Synapse would immediately retry a failing push endpoint when a new event is received, ignoring any backoff timers. ([\#18363](https://github.com/element-hq/synapse/issues/18363))
- Pass leave from remote invite rejection down Sliding Sync. ([\#18375](https://github.com/element-hq/synapse/issues/18375))

### Updates to the Docker image

- In `configure_workers_and_start.py`, use the same absolute path of Python in the interpreter shebang, and invoke child Python processes with `sys.executable`. ([\#18291](https://github.com/element-hq/synapse/issues/18291))
- Optimize the build of the workers image. ([\#18292](https://github.com/element-hq/synapse/issues/18292))
- In `start_for_complement.sh`, replace some external program calls with shell builtins. ([\#18293](https://github.com/element-hq/synapse/issues/18293))
- When generating container scripts from templates, don't add a leading newline so that their shebangs may be handled correctly. ([\#18295](https://github.com/element-hq/synapse/issues/18295))

### Improved Documentation

- Improve formatting of the README file. ([\#18218](https://github.com/element-hq/synapse/issues/18218))
- Add documentation for configuring [Pocket ID](https://github.com/pocket-id/pocket-id) as an OIDC provider. ([\#18237](https://github.com/element-hq/synapse/issues/18237))
- Fix typo in docs about the `push` config option. Contributed by @HarHarLinks. ([\#18320](https://github.com/element-hq/synapse/issues/18320))
- Add `/_matrix/federation/v1/version` to list of federation endpoints that can be handled by workers. ([\#18377](https://github.com/element-hq/synapse/issues/18377))
- Add an Admin API endpoint `GET /_synapse/admin/v1/scheduled_tasks`  to fetch scheduled tasks. ([\#18384](https://github.com/element-hq/synapse/issues/18384))

### Internal Changes

- Return specific error code when adding an email address / phone number to account is not supported ([MSC4178](https://github.com/matrix-org/matrix-spec-proposals/pull/4178)). ([\#17578](https://github.com/element-hq/synapse/issues/17578))
- Stop auto-provisionning missing users & devices when delegating auth to Matrix Authentication Service. Requires MAS 0.13.0 or later. ([\#18181](https://github.com/element-hq/synapse/issues/18181))
- Apply file hashing and existing quarantines to media downloaded for URL previews. ([\#18297](https://github.com/element-hq/synapse/issues/18297))
- Allow a few admin APIs used by matrix-authentication-service to run on workers. ([\#18313](https://github.com/element-hq/synapse/issues/18313))
- Apply `should_drop_federated_event` to federation invites. ([\#18330](https://github.com/element-hq/synapse/issues/18330))
- Allow `/rooms/` admin API to be run on workers. ([\#18360](https://github.com/element-hq/synapse/issues/18360))
- Minor performance improvements to the notifier. ([\#18367](https://github.com/element-hq/synapse/issues/18367))
- Slight performance increase when using the ratelimiter. ([\#18369](https://github.com/element-hq/synapse/issues/18369))
- Don't validate the `at_hash` (access token hash) field in OIDC ID Tokens if we don't end up actually using the OIDC Access Token. ([\#18374](https://github.com/element-hq/synapse/issues/18374), [\#18385](https://github.com/element-hq/synapse/issues/18385))
- Fixed test failures when using authlib 1.5.2. ([\#18390](https://github.com/element-hq/synapse/issues/18390))
- Refactor [MSC4186](https://github.com/matrix-org/matrix-spec-proposals/pull/4186) Simplified Sliding Sync room list tests to cover both new and fallback logic paths. ([\#18399](https://github.com/element-hq/synapse/issues/18399))



### Updates to locked dependencies

* Bump actions/add-to-project from 280af8ae1f83a494cfad2cb10f02f6d13529caa9 to 5b1a254a3546aef88e0a7724a77a623fa2e47c36. ([\#18365](https://github.com/element-hq/synapse/issues/18365))
* Bump actions/download-artifact from 4.2.1 to 4.3.0. ([\#18364](https://github.com/element-hq/synapse/issues/18364))
* Bump actions/setup-go from 5.4.0 to 5.5.0. ([\#18426](https://github.com/element-hq/synapse/issues/18426))
* Bump anyhow from 1.0.97 to 1.0.98. ([\#18336](https://github.com/element-hq/synapse/issues/18336))
* Bump packaging from 24.2 to 25.0. ([\#18393](https://github.com/element-hq/synapse/issues/18393))
* Bump pillow from 11.1.0 to 11.2.1. ([\#18429](https://github.com/element-hq/synapse/issues/18429))
* Bump pydantic from 2.10.3 to 2.11.4. ([\#18394](https://github.com/element-hq/synapse/issues/18394))
* Bump pyo3-log from 0.12.2 to 0.12.3. ([\#18317](https://github.com/element-hq/synapse/issues/18317))
* Bump pyopenssl from 24.3.0 to 25.0.0. ([\#18315](https://github.com/element-hq/synapse/issues/18315))
* Bump sha2 from 0.10.8 to 0.10.9. ([\#18395](https://github.com/element-hq/synapse/issues/18395))
* Bump sigstore/cosign-installer from 3.8.1 to 3.8.2. ([\#18366](https://github.com/element-hq/synapse/issues/18366))
* Bump softprops/action-gh-release from 1 to 2. ([\#18264](https://github.com/element-hq/synapse/issues/18264))
* Bump stefanzweifel/git-auto-commit-action from 5.1.0 to 5.2.0. ([\#18354](https://github.com/element-hq/synapse/issues/18354))
* Bump txredisapi from 1.4.10 to 1.4.11. ([\#18392](https://github.com/element-hq/synapse/issues/18392))
* Bump types-jsonschema from 4.23.0.20240813 to 4.23.0.20241208. ([\#18305](https://github.com/element-hq/synapse/issues/18305))
* Bump types-psycopg2 from 2.9.21.20250121 to 2.9.21.20250318. ([\#18316](https://github.com/element-hq/synapse/issues/18316))

# Synapse 1.129.0 (2025-05-06)

No significant changes since 1.129.0rc2.




# Synapse 1.129.0rc2 (2025-04-30)

Synapse 1.129.0rc1 was never formally released due to regressions discovered during the release process. 1.129.0rc2 fixes those regressions by reverting the affected PRs.

### Internal Changes

- Revert the slow background update introduced by [\#18068](https://github.com/element-hq/synapse/issues/18068) in v1.128.0. ([\#18372](https://github.com/element-hq/synapse/issues/18372))
- Revert "Add total event, unencrypted message, and e2ee event counts to stats reporting", added in v1.129.0rc1. ([\#18373](https://github.com/element-hq/synapse/issues/18373))




# Synapse 1.129.0rc1 (2025-04-15)

### Features

- Add `passthrough_authorization_parameters` in OIDC configuration to allow passing parameters to the authorization grant URL. ([\#18232](https://github.com/element-hq/synapse/issues/18232))
- Add `total_event_count`, `total_message_count`, and `total_e2ee_event_count` fields to the homeserver usage statistics. ([\#18260](https://github.com/element-hq/synapse/issues/18260))

### Bugfixes

- Fix `force_tracing_for_users` config when using delegated auth. ([\#18334](https://github.com/element-hq/synapse/issues/18334))
- Fix the token introspection cache logging access tokens when MAS integration is in use. ([\#18335](https://github.com/element-hq/synapse/issues/18335))
- Stop caching introspection failures when delegating auth to MAS. ([\#18339](https://github.com/element-hq/synapse/issues/18339))
- Fix `ExternalIDReuse` exception after migrating to MAS on workers with a high traffic. ([\#18342](https://github.com/element-hq/synapse/issues/18342))
- Fix minor performance regression caused by tracking of room participation. Regressed in v1.128.0. ([\#18345](https://github.com/element-hq/synapse/issues/18345))

### Updates to the Docker image

- Optimize the build of the complement-synapse image. ([\#18294](https://github.com/element-hq/synapse/issues/18294))

### Internal Changes

- Disable statement timeout during room purge. ([\#18133](https://github.com/element-hq/synapse/issues/18133))
- Add cache to storage functions used to auth requests when using delegated auth. ([\#18337](https://github.com/element-hq/synapse/issues/18337))




# Synapse 1.128.0 (2025-04-08)

No significant changes since 1.128.0rc1.




# Synapse 1.128.0rc1 (2025-04-01)

### Features

- Add an access token introspection cache to make Matrix Authentication Service integration ([MSC3861](https://github.com/matrix-org/matrix-doc/pull/3861)) more efficient. ([\#18231](https://github.com/element-hq/synapse/issues/18231))
- Add background job to clear unreferenced state groups. ([\#18254](https://github.com/element-hq/synapse/issues/18254))
- Hashes of media files are now tracked by Synapse. Media quarantines will now apply to all files with the same hash. ([\#18277](https://github.com/element-hq/synapse/issues/18277), [\#18302](https://github.com/element-hq/synapse/issues/18302), [\#18296](https://github.com/element-hq/synapse/issues/18296))

### Bugfixes

- Add index to sliding sync ([MSC4186](https://github.com/matrix-org/matrix-doc/pull/4186)) membership snapshot table, to fix a performance issue. ([\#18074](https://github.com/element-hq/synapse/issues/18074))

### Updates to the Docker image

- Specify the architecture of installed packages via an APT config option, which is more reliable than appending package names with `:{arch}`. ([\#18271](https://github.com/element-hq/synapse/issues/18271))
- Always specify base image debian versions with a build argument. ([\#18272](https://github.com/element-hq/synapse/issues/18272))
- Allow passing arguments to `start_for_complement.sh` (to be sent to `configure_workers_and_start.py`). ([\#18273](https://github.com/element-hq/synapse/issues/18273))
- Make some improvements to the `prefix-log` script in the workers image. ([\#18274](https://github.com/element-hq/synapse/issues/18274))
- Use `uv pip` to install `supervisor` in the worker image. ([\#18275](https://github.com/element-hq/synapse/issues/18275))
- Avoid needing to download & use `rsync` in a build layer. ([\#18287](https://github.com/element-hq/synapse/issues/18287))

### Improved Documentation

- Fix how to obtain access token and change naming from riot to element ([\#18225](https://github.com/element-hq/synapse/issues/18225))
- Correct a small typo in the SSO mapping providers documentation. ([\#18276](https://github.com/element-hq/synapse/issues/18276))
- Add docs for how to clear out the Poetry wheel cache. ([\#18283](https://github.com/element-hq/synapse/issues/18283))

### Internal Changes

- Add a column `participant` to `room_memberships` table. ([\#18068](https://github.com/element-hq/synapse/issues/18068))
- Update Poetry to 2.1.1, including updating the lock file version. ([\#18251](https://github.com/element-hq/synapse/issues/18251))
- Pin GitHub Actions dependencies by commit hash. ([\#18255](https://github.com/element-hq/synapse/issues/18255))
- Add DB delta to remove the old state group deletion job. ([\#18284](https://github.com/element-hq/synapse/issues/18284))



### Updates to locked dependencies

* Bump actions/add-to-project from f5473ace9aeee8b97717b281e26980aa5097023f to 280af8ae1f83a494cfad2cb10f02f6d13529caa9. ([\#18303](https://github.com/element-hq/synapse/issues/18303))
* Bump actions/cache from 4.2.2 to 4.2.3. ([\#18266](https://github.com/element-hq/synapse/issues/18266))
* Bump actions/download-artifact from 4.2.0 to 4.2.1. ([\#18268](https://github.com/element-hq/synapse/issues/18268))
* Bump actions/setup-python from 5.4.0 to 5.5.0. ([\#18298](https://github.com/element-hq/synapse/issues/18298))
* Bump actions/upload-artifact from 4.6.1 to 4.6.2. ([\#18304](https://github.com/element-hq/synapse/issues/18304))
* Bump authlib from 1.4.1 to 1.5.1. ([\#18306](https://github.com/element-hq/synapse/issues/18306))
* Bump dawidd6/action-download-artifact from 8 to 9. ([\#18204](https://github.com/element-hq/synapse/issues/18204))
* Bump jinja2 from 3.1.5 to 3.1.6. ([\#18223](https://github.com/element-hq/synapse/issues/18223))
* Bump log from 0.4.26 to 0.4.27. ([\#18267](https://github.com/element-hq/synapse/issues/18267))
* Bump phonenumbers from 8.13.50 to 9.0.2. ([\#18299](https://github.com/element-hq/synapse/issues/18299))
* Bump pygithub from 2.5.0 to 2.6.1. ([\#18243](https://github.com/element-hq/synapse/issues/18243))
* Bump pyo3-log from 0.12.1 to 0.12.2. ([\#18269](https://github.com/element-hq/synapse/issues/18269))

# Synapse 1.127.1 (2025-03-26)

## Security
- Fix [CVE-2025-30355](https://www.cve.org/CVERecord?id=CVE-2025-30355) / [GHSA-v56r-hwv5-mxg6](https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6). **High severity vulnerability affecting federation. The vulnerability has been exploited in the wild.**



# Synapse 1.127.0 (2025-03-25)

No significant changes since 1.127.0rc1.




# Synapse 1.127.0rc1 (2025-03-18)

### Features

- Update [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) implementation to no longer cancel a user's own delayed state events with an event type & state key that match a more recent state event sent by that user. ([\#17810](https://github.com/element-hq/synapse/issues/17810))

### Improved Documentation

- Fixed a minor typo in the Synapse documentation. Contributed by @karuto12. ([\#18224](https://github.com/element-hq/synapse/issues/18224))

### Internal Changes

- Remove undocumented `SYNAPSE_USE_FROZEN_DICTS` environment variable. ([\#18123](https://github.com/element-hq/synapse/issues/18123))
- Fix detection of workflow failures in the release script. ([\#18211](https://github.com/element-hq/synapse/issues/18211))
- Add caching support to media endpoints. ([\#18235](https://github.com/element-hq/synapse/issues/18235))



### Updates to locked dependencies

* Bump anyhow from 1.0.96 to 1.0.97. ([\#18201](https://github.com/element-hq/synapse/issues/18201))
* Bump bcrypt from 4.2.1 to 4.3.0. ([\#18207](https://github.com/element-hq/synapse/issues/18207))
* Bump bytes from 1.10.0 to 1.10.1. ([\#18227](https://github.com/element-hq/synapse/issues/18227))
* Bump http from 1.2.0 to 1.3.1. ([\#18245](https://github.com/element-hq/synapse/issues/18245))
* Bump sentry-sdk from 2.19.2 to 2.22.0. ([\#18205](https://github.com/element-hq/synapse/issues/18205))
* Bump serde from 1.0.218 to 1.0.219. ([\#18228](https://github.com/element-hq/synapse/issues/18228))
* Bump serde_json from 1.0.139 to 1.0.140. ([\#18202](https://github.com/element-hq/synapse/issues/18202))
* Bump ulid from 1.2.0 to 1.2.1. ([\#18246](https://github.com/element-hq/synapse/issues/18246))

# Synapse 1.126.0 (2025-03-11)
Administrators using the Debian/Ubuntu packages from `packages.matrix.org`, please check
[the relevant section in the upgrade notes](https://github.com/element-hq/synapse/blob/release-v1.126/docs/upgrade.md#change-of-signing-key-expiry-date-for-the-debianubuntu-package-repository)
as we have recently updated the expiry date on the repository's GPG signing key. The old version of the key will expire on `2025-03-15`.

No significant changes since 1.126.0rc3.




# Synapse 1.126.0rc3 (2025-03-07)

### Bugfixes

- Revert the background job to clear unreferenced state groups (that was introduced in v1.126.0rc1), due to [a suspected issue](https://github.com/element-hq/synapse/issues/18217) that causes increased disk usage. ([\#18222](https://github.com/element-hq/synapse/issues/18222))




# Synapse 1.126.0rc2 (2025-03-05)


### Internal Changes

- Fix wheel building configuration in CI by installing libatomic1. ([\#18212](https://github.com/element-hq/synapse/issues/18212), [\#18213](https://github.com/element-hq/synapse/issues/18213))

# Synapse 1.126.0rc1 (2025-03-04)

Synapse 1.126.0rc1 was not fully released due to an error in CI.

### Features

- Define ratelimit configuration for delayed event management. ([\#18019](https://github.com/element-hq/synapse/issues/18019))
- Add `form_secret_path` config option. ([\#18090](https://github.com/element-hq/synapse/issues/18090))
- Add the `--no-secrets-in-config` command line option. ([\#18092](https://github.com/element-hq/synapse/issues/18092))
- Add background job to clear unreferenced state groups. ([\#18154](https://github.com/element-hq/synapse/issues/18154))
- Add support for specifying/overriding `id_token_signing_alg_values_supported` for an OpenID identity provider. ([\#18177](https://github.com/element-hq/synapse/issues/18177))
- Add `worker_replication_secret_path` config option. ([\#18191](https://github.com/element-hq/synapse/issues/18191))
- Add support for specifying/overriding `redirect_uri` in the authorization and token requests against an OpenID identity provider. ([\#18197](https://github.com/element-hq/synapse/issues/18197))

### Bugfixes

- Make sure we advertise registration as disabled when [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) is enabled. ([\#17661](https://github.com/element-hq/synapse/issues/17661))
- Prevent suspended users from sending encrypted messages. ([\#18157](https://github.com/element-hq/synapse/issues/18157))
- Cleanup deleted state group references. ([\#18165](https://github.com/element-hq/synapse/issues/18165))
- Fix [MSC4108 QR-code login](https://github.com/matrix-org/matrix-spec-proposals/pull/4108) not working with some reverse-proxy setups. ([\#18178](https://github.com/element-hq/synapse/issues/18178))
- Support device IDs that can't be represented in a scope when delegating auth to Matrix Authentication Service 0.15.0+. ([\#18174](https://github.com/element-hq/synapse/issues/18174))

### Updates to the Docker image

- Speed up the building of the Docker image. ([\#18038](https://github.com/element-hq/synapse/issues/18038))

### Improved Documentation

- Move incorrectly placed version indicator in User Event Redaction Admin API docs. ([\#18152](https://github.com/element-hq/synapse/issues/18152))
- Document suspension Admin API. ([\#18162](https://github.com/element-hq/synapse/issues/18162))

### Deprecations and Removals

- Disable room list publication by default. ([\#18175](https://github.com/element-hq/synapse/issues/18175))

### Updates to locked dependencies

* Bump anyhow from 1.0.95 to 1.0.96. ([\#18187](https://github.com/element-hq/synapse/issues/18187))
* Bump authlib from 1.4.0 to 1.4.1. ([\#18190](https://github.com/element-hq/synapse/issues/18190))
* Bump click from 8.1.7 to 8.1.8. ([\#18189](https://github.com/element-hq/synapse/issues/18189))
* Bump log from 0.4.25 to 0.4.26. ([\#18184](https://github.com/element-hq/synapse/issues/18184))
* Bump pyo3-log from 0.12.0 to 0.12.1. ([\#18046](https://github.com/element-hq/synapse/issues/18046))
* Bump serde from 1.0.217 to 1.0.218. ([\#18183](https://github.com/element-hq/synapse/issues/18183))
* Bump serde_json from 1.0.138 to 1.0.139. ([\#18186](https://github.com/element-hq/synapse/issues/18186))
* Bump sigstore/cosign-installer from 3.8.0 to 3.8.1. ([\#18185](https://github.com/element-hq/synapse/issues/18185))
* Bump types-psycopg2 from 2.9.21.20241019 to 2.9.21.20250121. ([\#18188](https://github.com/element-hq/synapse/issues/18188))


# Synapse 1.125.0 (2025-02-25)

No significant changes since 1.125.0rc1.


# Synapse 1.125.0rc1 (2025-02-18)

### Features

- Add functionality to be able to use multiple values in SSO feature `attribute_requirements`. ([\#17949](https://github.com/element-hq/synapse/issues/17949))
- Add experimental config options `admin_token_path` and `client_secret_path` for [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861). ([\#18004](https://github.com/element-hq/synapse/issues/18004))
- Add `get_current_time_msec()` method to the [module API](https://matrix-org.github.io/synapse/latest/modules/writing_a_module.html) for sound time comparisons with Synapse. ([\#18144](https://github.com/element-hq/synapse/issues/18144))

### Bugfixes

- Update the response when a client attempts to add an invalid email address to the user's account from a 500, to a 400 with error text. ([\#18125](https://github.com/element-hq/synapse/issues/18125))
- Fix user directory search when using a legacy module with a `check_username_for_spam` callback. Broke in v1.122.0. ([\#18135](https://github.com/element-hq/synapse/issues/18135))

### Updates to the Docker image

- Add `SYNAPSE_HTTP_PROXY`/`SYNAPSE_HTTPS_PROXY`/`SYNAPSE_NO_PROXY` environment variables to pass through specifically to the Synapse process (instead of needing to apply [`http_proxy`/`https_proxy`/`no_proxy`](https://element-hq.github.io/synapse/latest/setup/forward_proxy.html) globally). ([\#18158](https://github.com/element-hq/synapse/issues/18158))

### Improved Documentation

- Add Oracle Linux 8 and 9 installation instructions. ([\#17436](https://github.com/element-hq/synapse/issues/17436))
- Document missing server config options (`daemonize`, `print_pidfile`, `user_agent_suffix`, `use_frozen_dicts`, `manhole`). ([\#18122](https://github.com/element-hq/synapse/issues/18122))
- Document consequences of replacing secrets. ([\#18138](https://github.com/element-hq/synapse/issues/18138))
- Make `burst_count` field an integer in `rc_presence` config documentation example. ([\#18159](https://github.com/element-hq/synapse/issues/18159))

### Internal Changes

- Overload `DatabasePool.simple_select_one_txn` to return non-`None` when the `allow_none` parameter is `False`. ([\#17616](https://github.com/element-hq/synapse/issues/17616))
- Python 3.8 EOL: compile native extensions with the 3.9 ABI and use typing hints from the standard library. ([\#17967](https://github.com/element-hq/synapse/issues/17967))
- Add log message when worker lock timeouts get large. ([\#18124](https://github.com/element-hq/synapse/issues/18124))
- Make it explicit that you can buy an AGPL-alternative commercial license from Element. ([\#18134](https://github.com/element-hq/synapse/issues/18134))
- Fix the 'Fix linting' GitHub Actions workflow. ([\#18136](https://github.com/element-hq/synapse/issues/18136))
- Do not log at the exception-level when clients provide empty `since` token to `/sync` API. ([\#18139](https://github.com/element-hq/synapse/issues/18139))
- Reduce database load of user search when using large search terms. ([\#18172](https://github.com/element-hq/synapse/issues/18172))



### Updates to locked dependencies

* Bump bcrypt from 4.2.0 to 4.2.1. ([\#18127](https://github.com/element-hq/synapse/issues/18127))
* Bump bytes from 1.9.0 to 1.10.0. ([\#18149](https://github.com/element-hq/synapse/issues/18149))
* Bump gitpython from 3.1.43 to 3.1.44. ([\#18128](https://github.com/element-hq/synapse/issues/18128))
* Bump hiredis from 3.0.0 to 3.1.0. ([\#18169](https://github.com/element-hq/synapse/issues/18169))
* Bump serde_json from 1.0.137 to 1.0.138. ([\#18129](https://github.com/element-hq/synapse/issues/18129))
* Bump service-identity from 24.1.0 to 24.2.0. ([\#18171](https://github.com/element-hq/synapse/issues/18171))
* Bump sigstore/cosign-installer from 3.7.0 to 3.8.0. ([\#18147](https://github.com/element-hq/synapse/issues/18147))
* Bump twine from 6.0.1 to 6.1.0. ([\#18170](https://github.com/element-hq/synapse/issues/18170))
* Bump types-pyyaml from 6.0.12.20240917 to 6.0.12.20241230. ([\#18097](https://github.com/element-hq/synapse/issues/18097))
* Bump ulid from 1.1.4 to 1.2.0. ([\#18148](https://github.com/element-hq/synapse/issues/18148))

# Synapse 1.124.0 (2025-02-11)

No significant changes since 1.124.0rc3.




# Synapse 1.124.0rc3 (2025-02-07)

### Bugfixes

- Fix regression in performance of sending events due to superfluous reads and locks. Introduced in v1.124.0rc1. ([\#18141](https://github.com/element-hq/synapse/issues/18141))




# Synapse 1.124.0rc2 (2025-02-05)

### Bugfixes

- Fix regression where persisting events in some rooms could fail after a previous unclean shutdown. Introduced in v1.124.0rc1. ([\#18137](https://github.com/element-hq/synapse/issues/18137))




# Synapse 1.124.0rc1 (2025-02-04)

### Bugfixes

- Add rate limit `rc_presence.per_user`. This prevents load from excessive presence updates sent by clients via sync api. Also rate limit `/_matrix/client/v3/presence` as per the spec. Contributed by @rda0. ([\#18000](https://github.com/element-hq/synapse/issues/18000))
- Deactivated users will no longer automatically accept an invite when `auto_accept_invites` is enabled. ([\#18073](https://github.com/element-hq/synapse/issues/18073))
- Fix join being denied after being invited over federation. Also fixes other out-of-band membership transitions. ([\#18075](https://github.com/element-hq/synapse/issues/18075))
- Updates contributed `docker-compose.yml` file to PostgreSQL v15, as v12 is no longer supported by Synapse.
  Contributed by @maxkratz. ([\#18089](https://github.com/element-hq/synapse/issues/18089))
- Fix rare edge case where state groups could be deleted while we are persisting new events that reference them. ([\#18107](https://github.com/element-hq/synapse/issues/18107), [\#18130](https://github.com/element-hq/synapse/issues/18130), [\#18131](https://github.com/element-hq/synapse/issues/18131))
- Raise an error if someone is using an incorrect suffix in a config duration string. ([\#18112](https://github.com/element-hq/synapse/issues/18112))
- Fix a bug where the [Delete Room Admin API](https://element-hq.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version) would fail if the `block` parameter was set to `true` and a worker other than the main process was configured to handle background tasks. ([\#18119](https://github.com/element-hq/synapse/issues/18119))

### Internal Changes

- Increase the length of the generated `nonce` parameter when perfoming OIDC logins to comply with the TI-Messenger spec. ([\#18109](https://github.com/element-hq/synapse/issues/18109))



### Updates to locked dependencies

* Bump dawidd6/action-download-artifact from 7 to 8. ([\#18108](https://github.com/element-hq/synapse/issues/18108))
* Bump log from 0.4.22 to 0.4.25. ([\#18098](https://github.com/element-hq/synapse/issues/18098))
* Bump python-multipart from 0.0.18 to 0.0.20. ([\#18096](https://github.com/element-hq/synapse/issues/18096))
* Bump serde_json from 1.0.135 to 1.0.137. ([\#18099](https://github.com/element-hq/synapse/issues/18099))
* Bump types-bleach from 6.1.0.20240331 to 6.2.0.20241123. ([\#18082](https://github.com/element-hq/synapse/issues/18082))

# Synapse 1.123.0 (2025-01-28)

No significant changes since 1.123.0rc1.




# Synapse 1.123.0rc1 (2025-01-21)

### Features

- Implement [MSC4133](https://github.com/matrix-org/matrix-spec-proposals/pull/4133) for custom profile fields. Contributed by @clokep. ([\#17488](https://github.com/element-hq/synapse/issues/17488))
- Add a query parameter `type` to the [Room State Admin API](https://element-hq.github.io/synapse/develop/admin_api/rooms.html#room-state-api) that filters the state event. ([\#18035](https://github.com/element-hq/synapse/issues/18035))
- Support the new `/auth_metadata` endpoint defined in [MSC2965](https://github.com/matrix-org/matrix-spec-proposals/pull/2965). ([\#18093](https://github.com/element-hq/synapse/issues/18093))

### Bugfixes

- Fix membership caches not updating in state reset scenarios. ([\#17732](https://github.com/element-hq/synapse/issues/17732))
- Fix rare race where on upgrade to v1.122.0 a long running database upgrade could lock out new events from being received or sent. ([\#18091](https://github.com/element-hq/synapse/issues/18091))

### Improved Documentation

- Document `tls` option for a worker instance in `instance_map`. ([\#18064](https://github.com/element-hq/synapse/issues/18064))

### Deprecations and Removals

- Remove the unstable [MSC4151](https://github.com/matrix-org/matrix-spec-proposals/pull/4151) implementation. The stable support remains, per [Matrix 1.13](https://spec.matrix.org/v1.13/client-server-api/#post_matrixclientv3roomsroomidreport). ([\#18052](https://github.com/element-hq/synapse/issues/18052))

### Internal Changes

- Increase invite rate limits (`rc_invites.per_issuer`) for Complement. ([\#18072](https://github.com/element-hq/synapse/issues/18072))



### Updates to locked dependencies

* Bump jinja2 from 3.1.4 to 3.1.5. ([\#18067](https://github.com/element-hq/synapse/issues/18067))
* Bump mypy from 1.12.1 to 1.13.0. ([\#18083](https://github.com/element-hq/synapse/issues/18083))
* Bump pillow from 11.0.0 to 11.1.0. ([\#18084](https://github.com/element-hq/synapse/issues/18084))
* Bump pyo3 from 0.23.3 to 0.23.4. ([\#18079](https://github.com/element-hq/synapse/issues/18079))
* Bump pyopenssl from 24.2.1 to 24.3.0. ([\#18062](https://github.com/element-hq/synapse/issues/18062))
* Bump serde_json from 1.0.134 to 1.0.135. ([\#18081](https://github.com/element-hq/synapse/issues/18081))
* Bump ulid from 1.1.3 to 1.1.4. ([\#18080](https://github.com/element-hq/synapse/issues/18080))

# Synapse 1.122.0 (2025-01-14)

Please note that this version of Synapse drops support for PostgreSQL 11 and 12. The minimum version of PostgreSQL supported is now version 13.

No significant changes since 1.122.0rc1.


# Synapse 1.122.0rc1 (2025-01-07)

### Deprecations and Removals

- Remove support for PostgreSQL 11 and 12. Contributed by @clokep. ([\#18034](https://github.com/element-hq/synapse/issues/18034))

### Features

- Added the `email.tlsname` config option.  This allows specifying the domain name used to validate the SMTP server's TLS certificate separately from the `email.smtp_host` to connect to. ([\#17849](https://github.com/element-hq/synapse/issues/17849))
- Module developers will have access to the user ID of the requester when adding `check_username_for_spam` callbacks to `spam_checker_module_callbacks`. Contributed by Wilson@Pangea.chat. ([\#17916](https://github.com/element-hq/synapse/issues/17916))
- Add endpoints to the Admin API to fetch the number of invites the provided user has sent after a given timestamp,
  fetch the number of rooms the provided user has joined after a given timestamp, and get report IDs of event
  reports against a provided user (i.e. where the user was the sender of the reported event). ([\#17948](https://github.com/element-hq/synapse/issues/17948))
- Support stable account suspension from [MSC3823](https://github.com/matrix-org/matrix-spec-proposals/pull/3823). ([\#17964](https://github.com/element-hq/synapse/issues/17964))
- Add `macaroon_secret_key_path` config option. ([\#17983](https://github.com/element-hq/synapse/issues/17983))

### Bugfixes

- Fix bug when rejecting withdrew invite with a `third_party_rules` module, where the invite would be stuck for the client. ([\#17930](https://github.com/element-hq/synapse/issues/17930))
- Properly purge state groups tables when purging a room with the Admin API. ([\#18024](https://github.com/element-hq/synapse/issues/18024))
- Fix a bug preventing the admin redaction endpoint from working on messages from remote users. ([\#18029](https://github.com/element-hq/synapse/issues/18029), [\#18043](https://github.com/element-hq/synapse/issues/18043))

### Improved Documentation

- Update `synapse.app.generic_worker` documentation to only recommend `GET` requests for stream writer routes by default, unless the worker is also configured as a stream writer. Contributed by @evoL. ([\#17954](https://github.com/element-hq/synapse/issues/17954))
- Add documentation for the previously-undocumented `last_seen_ts` query parameter to the query user Admin API. ([\#17976](https://github.com/element-hq/synapse/issues/17976))
- Improve documentation for the `TaskScheduler` class. ([\#17992](https://github.com/element-hq/synapse/issues/17992))
- Fix example in reverse proxy docs to include server port. ([\#17994](https://github.com/element-hq/synapse/issues/17994))
- Update Alpine Linux Synapse Package Maintainer within the installation instructions. ([\#17846](https://github.com/element-hq/synapse/issues/17846))

### Internal Changes

- Add `RoomID` & `EventID` rust types. ([\#17996](https://github.com/element-hq/synapse/issues/17996))
- Fix various type errors across the codebase. ([\#17998](https://github.com/element-hq/synapse/issues/17998))
- Disable DB statement timeout when doing a room purge since it can be quite long. ([\#18017](https://github.com/element-hq/synapse/issues/18017))
- Remove some remaining uses of `twisted.internet.defer.returnValue`. Contributed by Colin Watson. ([\#18020](https://github.com/element-hq/synapse/issues/18020))
- Refactor `get_profile` to no longer include fields with a value of `None`. ([\#18063](https://github.com/element-hq/synapse/issues/18063))

### Updates to locked dependencies

* Bump anyhow from 1.0.93 to 1.0.95. ([\#18012](https://github.com/element-hq/synapse/issues/18012), [\#18045](https://github.com/element-hq/synapse/issues/18045))
* Bump authlib from 1.3.2 to 1.4.0. ([\#18048](https://github.com/element-hq/synapse/issues/18048))
* Bump dawidd6/action-download-artifact from 6 to 7. ([\#17981](https://github.com/element-hq/synapse/issues/17981))
* Bump http from 1.1.0 to 1.2.0. ([\#18013](https://github.com/element-hq/synapse/issues/18013))
- Bump mypy from 1.11.2 to 1.12.1. ([\#17999](https://github.com/element-hq/synapse/issues/17999))
* Bump mypy-zope from 1.0.8 to 1.0.9. ([\#18047](https://github.com/element-hq/synapse/issues/18047))
* Bump pillow from 10.4.0 to 11.0.0. ([\#18015](https://github.com/element-hq/synapse/issues/18015))
* Bump pydantic from 2.9.2 to 2.10.3. ([\#18014](https://github.com/element-hq/synapse/issues/18014))
* Bump pyicu from 2.13.1 to 2.14. ([\#18060](https://github.com/element-hq/synapse/issues/18060))
* Bump pyo3 from 0.23.2 to 0.23.3. ([\#18001](https://github.com/element-hq/synapse/issues/18001))
* Bump python-multipart from 0.0.16 to 0.0.18. ([\#17985](https://github.com/element-hq/synapse/issues/17985))
* Bump sentry-sdk from 2.17.0 to 2.19.2. ([\#18061](https://github.com/element-hq/synapse/issues/18061))
* Bump serde from 1.0.215 to 1.0.217. ([\#18031](https://github.com/element-hq/synapse/issues/18031), [\#18059](https://github.com/element-hq/synapse/issues/18059))
* Bump serde_json from 1.0.133 to 1.0.134. ([\#18044](https://github.com/element-hq/synapse/issues/18044))
* Bump twine from 5.1.1 to 6.0.1. ([\#18049](https://github.com/element-hq/synapse/issues/18049))

**Changelogs for older versions can be found [here](docs/changelogs/).**