diff --git a/backend/Dockerfile b/backend/Dockerfile
index 9ee0316..ea70990 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/astral-sh/uv:python3.13-alpine
+FROM ghcr.io/astral-sh/uv:python3.13-alpine@sha256:d739b9119aa2a83e34636abb747e7aff0891c14a798f6bd756f0e1e74530d34b
 
 RUN apk add --no-cache tzdata