diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index ea3c3435..b5866c0c 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -1,5 +1,12 @@
 FROM php:8.3.36-apache-bookworm@sha256:cbd3b3d9011668443d54ab40ec31db56c73d91b4c8198935d639aa80d2d815c1 AS php-base
 
+# 国内构建机访问 deb.debian.org 常被代理拦截（502），统一改用清华 Debian 镜像。
+RUN set -eu; \
+    for f in /etc/apt/sources.list /etc/apt/sources.list.d/*.sources /etc/apt/sources.list.d/*.list; do \
+        [ -f "$f" ] || continue; \
+        sed -i 's|deb.debian.org|mirrors.tuna.tsinghua.edu.cn|g; s|security.debian.org|mirrors.tuna.tsinghua.edu.cn|g' "$f"; \
+    done
+
 RUN apt-get -o Acquire::Retries=3 update \
     && apt-get -o Acquire::Retries=3 install -y --no-install-recommends \
         curl \