diff --git a/test.Dockerfile b/test.Dockerfile
index 9ee14137b..5f66105b8 100644
--- a/test.Dockerfile
+++ b/test.Dockerfile
@@ -1 +1 @@
-FROM buildpack-deps:bookworm
+FROM buildpack-deps:bookworm@sha256:c15cf15316aab40fffa9fb71bd6b1c2d576bc41d1a49a7c24eefbb6f75503096