diff --git a/Dockerfile b/Dockerfile
index 022092a..3f7e099 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8.12-slim-buster@sha256:5e275a12c3288c60879f691cf725546bd44bc8bb6593048a2fdf011fff2e20ca
+FROM python:3.9.7-slim-buster@sha256:d4e105b3841bc16e737bf98084413e7436ce9a05febfe2cd119f8a20da1a00d0
 
 # renovate: datasource=pypi depName=determine-docker-tags versioning=semver
 ENV DETERMINE_DOCKER_TAGS_VERSION 0.1.10