diff --git a/test.Dockerfile b/test.Dockerfile
index 9ee14137b..d5d9529ab 100644
--- a/test.Dockerfile
+++ b/test.Dockerfile
@@ -1 +1 @@
-FROM buildpack-deps:bookworm
+FROM buildpack-deps:bookworm@sha256:08d61da2eb4b661e95088f6999704803985f9bd7be23b3c5d7acce26cd2d521b