diff --git a/tools/Dockerfile b/tools/Dockerfile
index 82c9577..2ffe60d 100644
--- a/tools/Dockerfile
+++ b/tools/Dockerfile
@@ -43,7 +43,7 @@ RUN aqua install --all && \
 
 
 # =======================================================================================================================================
-FROM debian:bookworm-slim
+FROM debian:bookworm-slim@sha256:d365f4920711a9074c4bcd178e8f457ee59250426441ab2a5f8106ed8fe948eb
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 WORKDIR /