diff --git a/modules/base.nix b/modules/base.nix
index 8fd6b068..25fc42c0 100644
--- a/modules/base.nix
+++ b/modules/base.nix
@@ -44,9 +44,9 @@
     substituters = [
       # cache mirror located in China
       # status: https://mirror.sjtu.edu.cn/
-      "https://mirror.sjtu.edu.cn/nix-channels/store"
+      # "https://mirror.sjtu.edu.cn/nix-channels/store"
       # status: https://mirrors.ustc.edu.cn/status/
-      # "https://mirrors.ustc.edu.cn/nix-channels/store"
+      "https://mirrors.ustc.edu.cn/nix-channels/store"
 
       "https://nix-community.cachix.org"
       # my own cache server