diff --git a/Dockerfile b/Dockerfile
index ebe10ad..677aaaf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8.9-slim-buster@sha256:441fec60c5841168e86545badab6a3822320976da174005e9e8bffd494d3d916
+FROM python:3.9.3-slim-buster@sha256:3edfa765f8f77f333c50222b14552d0d0fa9f46659c1ead5f4fd10bf96178d3e
 
 # renovate: datasource=pypi depName=determine-docker-tags versioning=semver
 ENV DETERMINE_DOCKER_TAGS_VERSION 0.1.6