diff --git a/backend/Dockerfile b/backend/Dockerfile
index 3a0f489d..5683459d 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.12-slim
+FROM python:3.12.14-slim-bookworm@sha256:a116514e19457bcb7af7efe9c3dd0b9b71e85b317694e7882a1c52aa15a78134
 
 WORKDIR /app