diff --git a/flake.lock b/flake.lock
index 7b04d15..9d17cd3 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,18 +2,15 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1746576598,
-        "narHash": "sha256-FshoQvr6Aor5SnORVvh/ZdJ1Sa2U4ZrIMwKBX5k2wu0=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
+        "lastModified": 315532800,
+        "narHash": "sha256-kgy4FnRFGj62QO3kI6a6glFl8XUtKMylWGybnVCvycM=",
         "rev": "b3582c75c7f21ce0b429898980eddbbf05c68e55",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-25.05pre796313.b3582c75c7f2/nixexprs.tar.xz?rev=b3582c75c7f21ce0b429898980eddbbf05c68e55"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz"
       }
     },
     "root": {
diff --git a/flake.nix b/flake.nix
index 22ee02e..e485e11 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,5 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz";
 
   outputs =
     { self, nixpkgs }: