diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 278a3da4..c92bc757 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -73,7 +73,7 @@ explicit = true
 
 [[tool.uv.index]]
 name = "default"
-url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple"
+url = "https://mirrors.aliyun.com/pypi/simple"
 default = true
 
 [[tool.uv.index]]