diff --git a/pyproject.toml b/pyproject.toml
index f0aa79d..7048068 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,10 +37,10 @@ toml = "^0.10.2"
 build-backend = "poetry.core.masonry.api"
 requires = ["poetry-core>=1.0.0"]
 
-# [[tool.poetry.source]]
-# default = true
-# name = "tsinghua-pypi"
-# url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+[[tool.poetry.source]]
+default = true
+name = "tsinghua-pypi"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 
 [tool.isort]
 filter_files = true