diff --git a/flake.lock b/flake.lock
index 8d22a14..2e774e6 100644
--- a/flake.lock
+++ b/flake.lock
@@ -37,18 +37,15 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1747179050,
-        "narHash": "sha256-qhFMmDkeJX9KJwr5H32f1r7Prs7XbQWtO0h3V0a0rFY=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
+        "lastModified": 1747275534,
+        "narHash": "sha256-isj7Hlm5+PuoyyfVWOWgv52WXaKV6QgegYr9UKjBeQ4=",
         "rev": "adaa24fbf46737f3f1b5497bf64bae750f82942e",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-25.05pre799423.adaa24fbf467/nixexprs.tar.xz?rev=adaa24fbf46737f3f1b5497bf64bae750f82942e"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz"
       }
     },
     "root": {
diff --git a/flake.nix b/flake.nix
index f93aaca..347a1d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,7 +6,7 @@
       url = "github:hercules-ci/flake-parts";
       inputs.nixpkgs-lib.follows = "nixpkgs";
     };
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz";
     systems.url = "github:nix-systems/default";
     treefmt-nix = {
       url = "github:numtide/treefmt-nix";