diff --git a/Dockerfile b/Dockerfile
index cb3575e..9032f6a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:alpine
+FROM python:3.11-alpine
 
 ENV PYTHONUNBUFFERED=1 \
     ISSUER_NAME=letsencrypt \