diff --git a/Dockerfile b/Dockerfile
index 823a198..02bb8e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.13-alpine
+FROM python:3.13-alpine@sha256:399babc8b49529dabfd9c922f2b5eea81d611e4512e3ed250d75bd2e7683f4b0
 
 COPY LICENSE \
         README.md \