diff --git a/Dockerfile b/Dockerfile
index 290334f..2dfb3bd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bookworm-slim AS linux.git
+FROM debian:bookworm-slim@sha256:67b30a61dc87758f0caf819646104f29ecbda97d920aaf5edc834128ac8493d3 AS linux.git
 
 WORKDIR /src