diff --git a/flake.lock b/flake.lock
index 3b8bffd..d86f351 100644
--- a/flake.lock
+++ b/flake.lock
@@ -17,24 +17,6 @@
         "type": "github"
       }
     },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nix-darwin": {
       "inputs": {
         "nixpkgs": "nixpkgs"
@@ -85,25 +67,9 @@
     "root": {
       "inputs": {
         "brew-src": "brew-src",
-        "flake-utils": "flake-utils",
         "nix-darwin": "nix-darwin",
         "nixpkgs": "nixpkgs_2"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index ce0f4f6..23029de 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,35 +4,40 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     nix-darwin.url = "github:LnL7/nix-darwin";
-    flake-utils.url = "github:numtide/flake-utils";
     brew-src = {
       url = "github:Homebrew/brew/4.4.5";
       flake = false;
     };
   };
 
-  outputs = { self, nixpkgs, nix-darwin, flake-utils, brew-src, ... } @ inputs: let
+  outputs = { self, nixpkgs, nix-darwin, brew-src, ... } @ inputs: let
     # System types to support.
     supportedSystems = [ "x86_64-darwin" "aarch64-darwin" ];
 
     flakeLock = builtins.fromJSON (builtins.readFile ./flake.lock);
     brewVersion = flakeLock.nodes.brew-src.original.ref;
-  in flake-utils.lib.eachSystem supportedSystems (system: let
-    pkgs = nixpkgs.legacyPackages.${system};
+
+    forAllSystems =
+      function:
+      nixpkgs.lib.genAttrs supportedSystems (
+        system: function nixpkgs.legacyPackages.${system}
+      );
   in {
-    packages = pkgs.callPackage ./pkgs {
+    packages = forAllSystems (pkgs: pkgs.callPackage ./pkgs {
       inherit inputs;
-    };
-    devShell = pkgs.mkShell {
+    });
+
+    devShell = forAllSystems (pkgs: pkgs.mkShell {
       nativeBuildInputs = with pkgs; [
       ];
 
       BREW_SRC = brew-src;
-    };
-    ci = import ./ci (inputs // {
-      inherit pkgs;
     });
-  }) // {
+
+    ci = forAllSystems (pkgs: import ./ci (inputs // {
+      inherit pkgs;
+    }));
+
     darwinModules = {
       nix-homebrew = { lib, ... }: {
         imports = [