upgrading postgres shall be done in the next release.

README.md

@@ -22,7 +22,21 @@
 * Open the configured domain in your browser to create your user account (only works in case mail is configured correctly)
 * Give yourself admin rights by running `abra app cmd <app-name> app make_last_user_admin`
 
-## Manuel migration steps when upgrading from 0.6.0+v2.25.2 and earlier to 1.0.0+v2.25.2 and later
+## Migration guide
+
+### Upgrading to 4.0.0+v2.25.3 and later
+
+* Before upgrading to `4.0.0+v2.25.3` and later, one successful deployment of `3.0.0+v2.25.3` shall be performed. Doing both at the same time will lead to complications as 3.0.0 runs rails DB migrations and 4.0.0 upgrades the postgres DB version.
+
+### Broken releases
+
+Please do not use these releases, as they are having issues regarding database migrations:
+
+* 1.0.0+v2.25.2
+* 2.0.0+v2.25.3
+* 2.1.0+v2.25.3
+
+### Manual migration steps when upgrading from 0.6.0+v2.25.2 and earlier to 1.0.0+v2.25.2 and later
 
 * adapt your env file with the new vars, especially SECRET_DB_PASSWORD_VERSION=v1 and SECRET_SMTP_PASSWORD_VERSION=v1
 * insert your smtp password with `abra app secret insert <app-name> smtp_password v1 "<your-password>"`

compose.yml

@@ -98,7 +98,7 @@ services:
       - loomio_plugins:/loomio/plugins/docker
   db:
     # loomio version upgrades and postgres version upgrade should not be performed at the same time.
-    image: pgautoupgrade/pgautoupgrade:17-debian
+    image: postgres:12.17
     networks:
       - backend
     volumes: