Pin GitHub Actions to commit SHAs#779
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mdo
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Jun 5, 2026
Pin every external action (checkout, upload/download-artifact, cache, setup-bun, stickydisk) to a full commit SHA with a trailing version comment, so a moved tag can't silently change what runs in CI. SHAs were resolved from each action's published release tags.
Add a Dependabot github-actions config that opens grouped weekly PRs to bump the pinned SHAs and their version comments. It needs two entries because directory:/ only scans .github/workflows; the second covers the shared composite at .github/actions/setup. Add an actions-pinned CI job that fails any change introducing an external action referenced by a tag or branch instead of a full commit SHA (local ./ actions are exempt), so the pinning policy can't silently regress.
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Rebased on main and fixed format error |
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Pins every third-party action to a full commit SHA and adds the tooling to keep that policy fresh and enforced. A version tag like
@v4is mutable and whoever controls the action can repoint it at new code; SHA pinning isa way to mitigate supply-chain risks of actions we don't own.
Changes
checkout,upload/download-artifact,cache,setup-bun,stickydisk), each annotated with its# vX.Y.Z.github-actions, weekly, grouped) opens a single PR to bumpthe SHAs and their version comments. Uses
directorieswith a/.github/actions/*glob so the CI workflows and every local composite action are covered.
actions-pinnedCI job fails any change that introduces an externalaction referenced by tag/branch instead of a 40-char SHA (local
./actionsexempt), so the policy can't silently regress.
Notes
from each action's current release.
Actions pinned to SHAto themainbranch-protectionrequired checks so the guard blocks rather than just advises. Dependabot only
activates once
dependabot.ymlis on the default branch.