diff --git a/Containerfile.alpine b/Containerfile.alpine
index fce259b..6faa404 100644
--- a/Containerfile.alpine
+++ b/Containerfile.alpine
@@ -35,8 +35,8 @@ ARG RUBYGEM_R10K=5.0.3
 # renovate: datasource=rubygems depName=rugged
 ARG RUBYGEM_RUGGED=1.9.0
 
-ARG OPENVOX_USER_UID=1001
-ARG OPENVOX_USER_GID=1001
+ARG OPENVOX_USER_UID=64604
+ARG OPENVOX_USER_GID=64604
 
 # renovate: datasource=custom.voxpupuli-artifacts depName=openvox-server
 ARG OPENVOXSERVER_VERSION=8.14.1
diff --git a/Containerfile.ubuntu b/Containerfile.ubuntu
index 9743459..c192b56 100644
--- a/Containerfile.ubuntu
+++ b/Containerfile.ubuntu
@@ -44,8 +44,8 @@ ARG RUBYGEM_R10K=5.0.3
 # renovate: datasource=rubygems depName=rugged
 ARG RUBYGEM_RUGGED=1.9.0
 
-ARG OPENVOX_USER_UID=1001
-ARG OPENVOX_USER_GID=1001
+ARG OPENVOX_USER_UID=64604
+ARG OPENVOX_USER_GID=64604
 
 # renovate: datasource=custom.voxpupuli-artifacts depName=openvox-server
 ARG OPENVOXSERVER_VERSION=8.14.1
diff --git a/MIGRATION.md b/MIGRATION.md
new file mode 100644
index 0000000..f9b970a
--- /dev/null
+++ b/MIGRATION.md
@@ -0,0 +1,10 @@
+# Migrations
+
+## V8.12.0 -> V8.13.0
+
+UID is changed from 1001 on alpine and 999 on ubuntu to 64604.
+If you already deployed the containers with mounted volume, you NEED to change the ownershop of these volumes and the files underneath.
+
+```bash
+chown -R 64604:64604 [PATH TO THE VOLUME]
+```
diff --git a/README.md b/README.md
index ff71fb6..73b8c63 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@
 - [OpenVox Server container](#openvox-server-container)
   - [Informations](#informations)
     - [End of Life for OpenVox Server 7](#end-of-life-for-openvox-server-7)
+    - [Migration](#migration)
   - [Note about environment caching](#note-about-environment-caching)
   - [Version schema](#version-schema)
   - [Configuration](#configuration)
@@ -55,6 +56,10 @@ For compose file see: [CRAFTY](https://github.com/voxpupuli/crafty/tree/main/ope
 Consequently, no new OpenVox Server 7 releases will be build.
 Existing versions will be retained for continued access.
 
+### Migration
+
+Before updating to a newer version of your container, you should check the [migration document](MIGRATION.md)
+
 ## Note about environment caching
 
 ⚠️ The OpenVox Server has [the environment caching](https://www.puppet.com/docs/puppet/8/server/admin-api/v1/environment-cache.html) enabled by default.