diff --git a/flake.lock b/flake.lock
index c8eef535..761abd99 100644
--- a/flake.lock
+++ b/flake.lock
@@ -981,7 +981,7 @@
       },
       "original": {
         "owner": "CHN-beta",
-        "ref": "nixos-unstable",
+        "ref": "nixos-unstable-2505",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index a2308029..03d26744 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
 
   inputs =
   {
-    nixpkgs.url = "github:CHN-beta/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:CHN-beta/nixpkgs/nixos-unstable-2505";
     nixpkgs-2505.url = "github:CHN-beta/nixpkgs/nixos-25.05";
     nixpkgs-2411.url = "github:CHN-beta/nixpkgs/nixos-24.11";
     nixpkgs-2311.url = "github:CHN-beta/nixpkgs/nixos-23.11";