diff --git a/Dockerfile b/Dockerfile
index 3219997..9d0d442 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8-slim
+FROM python:3.9-slim
 
 LABEL "maintainer" "Sviatoslav Sydorenko <wk+pypa@sydorenko.org.ua>"
 LABEL "repository" "https://github.com/pypa/gh-action-pypi-publish"