should work now

flake.nix

@@ -3,7 +3,10 @@
   description = "horrible dotfiles for amazing distro";
 
   inputs = {
+      # nixpkgs 
       nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+      # unstable for a few packages
+      nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
       home-manager.url = "github:nix-community/home-manager/release-23.05";
       home-manager.inputs.nixpkgs.follows = "nixpkgs";
       # TODO(sako):: add agenix or sops-nix

modules/dev/nixd.nix

@@ -12,7 +12,7 @@ in
 
   config = mkIf cfg.enable {
     environment.systemPackages = with pkgs; [
-      nixd
+      unstable.nixd
       nixpkgs-fmt
     ];
   };

overlays/default.nix

@@ -24,8 +24,9 @@
     });
   };
 
-  # When applied, the unstable nixpkgs set (declared in the flake inputs) will
-  # be accessible through 'pkgs.unstable'
+  # lmao when did i add this
+  # for a few packages
+  # access through pkgs.unstable
   unstable-packages = final: _prev: {
     unstable = import inputs.nixpkgs-unstable {
       system = final.system;