diff --git a/containers/zammad/Dockerfile b/containers/zammad/Dockerfile
index a862055..ac015e8 100644
--- a/containers/zammad/Dockerfile
+++ b/containers/zammad/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.2-slim
+FROM ruby:2.4.4-slim
 MAINTAINER Zammad <info@zammad.org>
 ARG BUILD_DATE