diff --git a/containers/zammad-postgresql/Dockerfile b/containers/zammad-postgresql/Dockerfile
index 1b791f8..1d29c2c 100644
--- a/containers/zammad-postgresql/Dockerfile
+++ b/containers/zammad-postgresql/Dockerfile
@@ -1,4 +1,4 @@
-FROM postgres:9.6.24-alpine
+FROM postgres:15.0-alpine
 
 ARG BUILD_DATE