diff --git a/Dockerfile b/Dockerfile
index 75681b9..7b41545 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:slim-bullseye
+FROM python:3.9-slim-bullseye
 COPY tip.py /tip.py
 RUN pip install PyGithub --progress-bar off
 ENTRYPOINT ["/tip.py"]