diff --git a/test.Dockerfile b/test.Dockerfile
index 9ee14137b..590e77553 100644
--- a/test.Dockerfile
+++ b/test.Dockerfile
@@ -1 +1 @@
-FROM buildpack-deps:bookworm
+FROM buildpack-deps:bookworm@sha256:d9ae3b82599d29a7ed722f5b29805ed56dcdc60893140d7aa45b8eafa1be4f77