diff --git a/Dockerfile b/Dockerfile
index 23f9a9c..3e1dc6f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9.5-slim-buster
+FROM python:3.9.5-slim-buster@sha256:7783d80eca13fb9f8cfd8b84b27ac09ecc28f52bafdd9b943338b7e29e7741a5
 
 # renovate: datasource=github-tags depName=DuckBoss/JJMumbleBot versioning=semver
 ENV JJMUMBLEBOT_VERSION v5.1.1