diff --git a/compose.yml b/compose.yml
index 18b1846..1dc8635 100644
--- a/compose.yml
+++ b/compose.yml
@@ -71,7 +71,7 @@ services:
         - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`${EXTRA_DOMAINS})"
         - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
         - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
-        - "coop-cloud.${STACK_NAME}.version=3.0.0+v2.25.3"
+        - "coop-cloud.${STACK_NAME}.version=4.0.0+v2.25.3"
         - "backupbot.backup:=${ENABLE_BACKUPS:-true}"
   worker:
     image: loomio/loomio:v2.25.3
diff --git a/release/4.0.0+v2.25.3 b/release/4.0.0+v2.25.3
new file mode 100644
index 0000000..96e171a
--- /dev/null
+++ b/release/4.0.0+v2.25.3
@@ -0,0 +1 @@
+ATTENTION: Perform a deployment of version 3.0.0+v2.25.3 before upgrading to this version. Otherwise there will be complications with database migrations. This version upgrades the used postgres container to version 17 with auto-upgrade functionality. 
\ No newline at end of file