diff --git a/containers/zammad/Dockerfile b/containers/zammad/Dockerfile
index dad7c05..d007adf 100644
--- a/containers/zammad/Dockerfile
+++ b/containers/zammad/Dockerfile
@@ -6,7 +6,7 @@ ENV ZAMMAD_DIR /home/zammad
 ENV RAILS_ENV production
 ENV RAILS_SERVER puma
 ENV GIT_URL https://github.com/zammad/zammad.git
-ENV GIT_BRANCH master
+ENV GIT_BRANCH stable
 
 LABEL org.label-schema.build-date="$BUILD_DATE" \
       org.label-schema.name="Zammad" \