diff --git a/resources/chaosknoten/lists/docker_compose/compose.yaml.j2 b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
index b4372c05..f6194cb3 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
@@ -72,7 +72,7 @@ services:
     restart: unless-stopped
     command: ["uv", "run", "main.py", "sync"]
     environment:
-      - DRY_RUN=false
+      - DRY_RUN=true
       - KEYCLOAK_CLIENT_ID=mailman-sync
       - KEYCLOAK_CLIENT_SECRET={{ secret__lists__keycloak_client_secret }}
       - KEYCLOAK_REALM=ccchh