diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 49049d1ecf..800c3a018e 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -13,7 +13,7 @@
 # ---------------------------------------------------------------------------
 # Stage 1 — Builder (ephemeral: compiles deps + project wheel)
 # ---------------------------------------------------------------------------
-FROM python:3.14.3-slim@sha256:6a27522252aef8432841f224d9baaa6e9fce07b07584154fa0b9a96603af7456 AS builder
+FROM python:3.14.3-slim@sha256:584e89d31009a79ae4d9e3ab2fba078524a6c0921cb2711d05e8bb5f628fc9b9 AS builder
 
 COPY --from=ghcr.io/astral-sh/uv:0.10.9@sha256:10902f58a1606787602f303954cea099626a4adb02acbac4c69920fe9d278f82 /uv /uvx /bin/