diff --git a/cmak2zk/Dockerfile b/cmak2zk/Dockerfile
index f440a6b..52888b3 100644
--- a/cmak2zk/Dockerfile
+++ b/cmak2zk/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8-alpine3.12
+FROM python:rc-alpine3.12
 
 COPY *.py /app/bin/