diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..033d30c5
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "nixpkgs"]
+	path = nixpkgs
+	url = https://github.com/CHN-beta/nixpkgs.git
diff --git a/flake.lock b/flake.lock
index 1140483c..37ee9925 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1161,19 +1161,14 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1767530756,
-        "narHash": "sha256-8Li3OLnzc406/gOe+Sgu0bHoedzibvIJ77bk3/EOMqw=",
-        "owner": "CHN-beta",
-        "repo": "nixpkgs",
-        "rev": "d7f3d87456d890459fac2f3e3723340d60de10bb",
-        "type": "github"
+        "path": "nixpkgs",
+        "type": "path"
       },
       "original": {
-        "owner": "CHN-beta",
-        "ref": "nixos-25.11",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
+        "path": "nixpkgs",
+        "type": "path"
+      },
+      "parent": []
     },
     "nixvirt": {
       "inputs": {
diff --git a/flake.nix b/flake.nix
index f3a7c0fc..d8558973 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,8 @@
 
   inputs =
   {
-    nixpkgs.url = "github:CHN-beta/nixpkgs/nixos-25.11";
+    self.submodules = true;
+    nixpkgs.url = ./nixpkgs;
     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";
diff --git a/nixpkgs b/nixpkgs
new file mode 160000
index 00000000..d7f3d874
--- /dev/null
+++ b/nixpkgs
@@ -0,0 +1 @@
+Subproject commit d7f3d87456d890459fac2f3e3723340d60de10bb