diff --git a/Dockerfile b/Dockerfile
index c576885..3d9707d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8.10-slim-buster@sha256:6a6a4c1f2b2813b2745868469afb3177501dd97afa91153295130bdb90f7e4dd
+FROM python:3.9.5-slim-buster@sha256:655f71f243ee31eea6774e0b923b990cd400a0689eff049facd2703e57892447
 
 # renovate: datasource=pypi depName=determine-docker-tags versioning=semver
 ENV DETERMINE_DOCKER_TAGS_VERSION 0.1.6