diff --git a/spec/constant.nix b/spec/constant.nix
index f3de324e..e315b671 100644
--- a/spec/constant.nix
+++ b/spec/constant.nix
@@ -3,5 +3,6 @@
   time.timeZone = "Asia/Hong_Kong";
   environment.etc.nixos.source = "/nix/persist/config";
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nixpkgs.config.allowUnfree = true;
   system.stateVersion = "23.11";
 }