diff --git a/resources/chaosknoten/lists/docker_compose/compose.yaml b/resources/chaosknoten/lists/docker_compose/compose.yaml
index 232627a..160d60b 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml
@@ -56,7 +56,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - POSTGRES_PASSWORD=wvQjbMRnwFuxGEPz
-    image: postgres:12-alpine
+    image: postgres:18-alpine@sha256:f898ac406e1a9e05115cc2efcb3c3abb3a92a4c0263f3b6f6aaae354cbb1953a
     volumes:
       - /opt/mailman/database:/var/lib/postgresql/data
     networks: