diff --git a/test.Dockerfile b/test.Dockerfile
index 9ee14137b..0e833b17c 100644
--- a/test.Dockerfile
+++ b/test.Dockerfile
@@ -1 +1 @@
-FROM buildpack-deps:bookworm
+FROM buildpack-deps:bookworm@sha256:965fa1c1d00051764e5579830dbcadbdc12d31e168e32120f498eff4e81ce4f1