diff --git a/testserver/docker_mail/templates/docker-compose.yml b/testserver/docker_mail/templates/docker-compose.yml
index 38fec4932232634074ddf90f4dec937167ffd635..aa866d6812a3328e9a61d946003e336b0e3593db 100644
--- a/testserver/docker_mail/templates/docker-compose.yml
+++ b/testserver/docker_mail/templates/docker-compose.yml
@@ -166,7 +166,7 @@ services:
 
   # Additional Services: mailman
   mailman-core:
-    image: maxking/mailman-core:0.4
+    image: maxking/mailman-core:0.5
     restart: always
     env_file: mailman.env
     depends_on:
diff --git a/webserver/docker_mail/templates/docker-compose.yml b/webserver/docker_mail/templates/docker-compose.yml
index 8f128a5220e2d8f564b8d58e351f4c3ec7bba8e8..06911172bdb122de38f849d551cd86b08117cafd 100644
--- a/webserver/docker_mail/templates/docker-compose.yml
+++ b/webserver/docker_mail/templates/docker-compose.yml
@@ -166,7 +166,7 @@ services:
 
   # Additional Services: mailman
   mailman-core:
-    image: maxking/mailman-core:0.4
+    image: maxking/mailman-core:0.5
     restart: always
     env_file: mailman.env
     depends_on: