diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 83ae86e..322be82 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,5 +1,5 @@
 FROM ghcr.io/astral-sh/uv:0.5.24 AS uv
-FROM python:3.11-slim AS python
+FROM python:3.13-slim@sha256:026dd417a88d0be8ed5542a05cff5979d17625151be8a1e25a994f85c87962a5 AS python
 
 FROM mcr.microsoft.com/vscode/devcontainers/base:bookworm
 LABEL repository="www.coastalcommits.com/cswimr/SeaCogs"