diff --git a/Dockerfile b/Dockerfile
index 007d8b2..0061290 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8.11-slim-buster@sha256:713e6771846e20ded1b97b9b44bfdc19dfada418357a3fb8567611303d181dda
+FROM python:3.9.6-slim-buster@sha256:28bed4c51c3b531159d8affc0225701edb16a7deacfdfdfb220a944405c39314
 
 # renovate: datasource=pypi depName=determine-docker-tags versioning=semver
 ENV DETERMINE_DOCKER_TAGS_VERSION 0.1.10