diff --git a/backend/Dockerfile b/backend/Dockerfile
index b4d2a5b..790988e 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/astral-sh/uv:python3.13-trixie-slim
+FROM ghcr.io/astral-sh/uv:python3.13-trixie-slim@sha256:40215b626e22e4ff65839863624c4b885b8829b1a66ce895b7be20eca7fabe6d
 
 RUN apt-get update && apt-get install -y build-essential && rm -rf /var/lib/apt/lists/*