diff --git a/compose.yml b/compose.yml
index 7508641..c3efbab 100644
--- a/compose.yml
+++ b/compose.yml
@@ -51,7 +51,7 @@ 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.${STACK_NAME}.version=3.1.0+v2.0.0
+        - coop-cloud.${STACK_NAME}.version=4.0.0+v2.1.0
   db:
     image: pgautoupgrade/pgautoupgrade:18-alpine
     volumes:
diff --git a/release/4.0.0+v2.1.0 b/release/4.0.0+v2.1.0
new file mode 100644
index 0000000..713e1e0
--- /dev/null
+++ b/release/4.0.0+v2.1.0
@@ -0,0 +1 @@
+Switch to the new container of the Plausible Community Edition. Two new secrets need to be added. mail support is now available optionally. the clickhouse container was renamed, hopefully this does not lead to hickups.
\ No newline at end of file