diff --git a/flake.lock b/flake.lock
index 886e08e..277f342 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,24 +16,6 @@
         "type": "github"
       }
     },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1708161998,
@@ -53,24 +35,8 @@
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
-        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
-    },
-    "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 e535fa6..d44efe3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,6 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
-    flake-utils.url = "github:numtide/flake-utils";
 
     # Used for shell.nix
     flake-compat = {
@@ -15,11 +14,22 @@
   outputs = {
     self,
     nixpkgs,
-    flake-utils,
     ...
   }: let
+    inherit (nixpkgs) lib;
+
+    # flake-utils polyfill
+    eachSystem = systems: fn:
+      lib.foldl' (
+        acc: system:
+          lib.recursiveUpdate
+          acc
+          (lib.mapAttrs (_: value: {${system} = value;}) (fn system))
+      ) {}
+      systems;
+
     systems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
-    outputs = flake-utils.lib.eachSystem systems (system: let
+    outputs = eachSystem systems (system: let
       pkgs = nixpkgs.legacyPackages.${system};
     in rec {
       # The packages exported by the Flake:
@@ -33,7 +43,10 @@
       # this will use the latest default.
       apps = rec {
         default = apps.zig;
-        zig = flake-utils.lib.mkApp {drv = packages.default;};
+        zig = {
+          type = "app";
+          program = toString packages.default;
+        };
       };
 
       # nix fmt