diff --git a/inventories/z9/host_vars/dooris.yaml b/inventories/z9/host_vars/dooris.yaml
index 3f786aca..12b750b8 100644
--- a/inventories/z9/host_vars/dooris.yaml
+++ b/inventories/z9/host_vars/dooris.yaml
@@ -2,6 +2,6 @@ dooris__hostname: "dooris.ccchh.net"
 dooris__openid_client_id: "dooris"
 dooris__ccujack_user: "dooris"
 dooris__spaceapid_user: "dooris"
-dooris__main_lock: ~ # add "Hautpraum" once we have built it
+dooris__main_lock: "Hauptraum"
 
 certbot__acme_account_email_address: le-admin@hamburg.ccc.de
diff --git a/resources/chaosknoten/lists/docker_compose/compose.yaml.j2 b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
index 7a109e8c..2d299ef8 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
@@ -62,7 +62,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - "POSTGRES_PASSWORD={{ secret__lists__postgres_password }}"
-    image: docker.io/library/postgres:12-alpine
+    image: docker.io/library/postgres:13-alpine
     volumes:
       - /opt/mailman/database:/var/lib/postgresql/data
     networks: