diff --git a/docker/Dockerfile b/docker/Dockerfile
index 3a3bb8b..cfe1538 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8-alpine
+FROM python:3.9-alpine
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>" \
     org.label-schema.name="docker-tidy" \