diff --git a/backend/Dockerfile b/backend/Dockerfile
index 89df132..b7126e5 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim@sha256:531f855bda2c73cd6ef67d56b733b357cea384185b3022bd09f05e002cd144ca
 
 RUN apt-get update && apt-get install -y build-essential && rm -rf /var/lib/apt/lists/*