diff --git a/appengine/flexible/tasks/Dockerfile b/appengine/flexible/tasks/Dockerfile
index adaadec24ee..2b86863e735 100644
--- a/appengine/flexible/tasks/Dockerfile
+++ b/appengine/flexible/tasks/Dockerfile
@@ -14,7 +14,7 @@
 
 # Use the official Python image.
 # https://hub.docker.com/_/python
-FROM python:3.9
+FROM python:3.13.11
 
 # Copy local code to the container image.
 ENV APP_HOME /app