diff --git a/docker/base.Dockerfile b/docker/base.Dockerfile
index e2465f33c2..af025c5fea 100644
--- a/docker/base.Dockerfile
+++ b/docker/base.Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9-bullseye
+FROM python:3.13-bullseye
 LABEL maintainer="IETF Tools Team <tools-discuss@ietf.org>"
 
 ENV DEBIAN_FRONTEND=noninteractive