diff --git a/flake.lock b/flake.lock
index 83db597..842cd79 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,25 +16,25 @@
         "type": "github"
       }
     },
-    "flake-parts": {
+    "flake-utils": {
       "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib"
+        "systems": "systems"
       },
       "locked": {
-        "lastModified": 1696343447,
-        "narHash": "sha256-B2xAZKLkkeRFG5XcHHSXXcP7To9Xzr59KXeZiRf4vdQ=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "c9afaba3dfa4085dbd2ccb38dfade5141e33d9d4",
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
         "type": "github"
       },
       "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
+        "owner": "numtide",
+        "repo": "flake-utils",
         "type": "github"
       }
     },
-    "flake-utils": {
+    "flake-utils_2": {
       "locked": {
         "lastModified": 1659877975,
         "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
@@ -51,52 +51,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1696983906,
-        "narHash": "sha256-L7GyeErguS7Pg4h8nK0wGlcUTbfUMDu+HMf1UcyP72k=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "bd1cde45c77891214131cbbea5b1203e485a9d51",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-23.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-lib": {
-      "locked": {
-        "dir": "lib",
-        "lastModified": 1696019113,
-        "narHash": "sha256-X3+DKYWJm93DRSdC5M6K5hLqzSya9BjibtBsuARoPco=",
+        "lastModified": 1696725822,
+        "narHash": "sha256-B7uAOS7TkLlOg1aX01rQlYbydcyB6ZnLJSfaYbKVww8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f5892ddac112a1e9b3612c39af1b72987ee5783a",
+        "rev": "5aabb5780a11c500981993d49ee93cfa6df9307b",
         "type": "github"
       },
       "original": {
-        "dir": "lib",
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-unstable": {
-      "locked": {
-        "lastModified": 1697009197,
-        "narHash": "sha256-viVRhBTFT8fPJTb1N3brQIpFZnttmwo3JVKNuWRVc3s=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "01441e14af5e29c9d27ace398e6dd0b293e25a54",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "id": "nixpkgs",
+        "type": "indirect"
       }
     },
     "nixpkgs_2": {
@@ -117,24 +81,38 @@
     },
     "root": {
       "inputs": {
-        "flake-parts": "flake-parts",
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-unstable": "nixpkgs-unstable",
-        "zig-overlay": "zig-overlay"
+        "zig": "zig"
       }
     },
-    "zig-overlay": {
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "zig": {
       "inputs": {
         "flake-compat": "flake-compat",
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1697198920,
-        "narHash": "sha256-dtaoksNoOMC3H+FDF3cK+bP+jYvJokYBAFvzCALLDYk=",
+        "lastModified": 1696810944,
+        "narHash": "sha256-yvt223HLZlAJa/u4uzT5aw3ph2bifto/KfU2k+eX+jg=",
         "owner": "mitchellh",
         "repo": "zig-overlay",
-        "rev": "2d779a7657e346323ab048b218994dbdc42655d7",
+        "rev": "6dc03885321cc8aad6356c847148eb40e167f9fb",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 823a8df..f1f53ba 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,59 +1,47 @@
 {
   description = "FabApp";
 
+  # Inspired by https://github.com/mitchellh/zig-objc/blob/main/flake.nix
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
-    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    zig-overlay.url = "github:mitchellh/zig-overlay";
-    flake-parts.url = "github:hercules-ci/flake-parts";
+    # take unstable if not specified
+    # nixpkgs.url = "github:nixos/nixpkgs/release-23.05";
+    # nixpkgs.url = "github:NixOS/nixpkgs/unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    zig.url = "github:mitchellh/zig-overlay";
   };
 
-  outputs = inputs@{ flake-parts, nixpkgs, ... }:
-    flake-parts.lib.mkFlake { inherit inputs; } {
-      flake = {
-        # Put your original flake attributes here.
-      };
-
-      systems = [ "x86_64-linux" ];
-
-      # https://flake.parts/module-arguments.html#persystem-module-parameters
-      perSystem = { pkgs, system, ... }: {
-        # We need unstable for Zig
-        _module.args.pkgs = import inputs.nixpkgs-unstable {
-          inherit system;
-          # https://flake.parts/overlays
-          overlays = [
-            inputs.zig-overlay.overlays.default
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    ...
+  } @ inputs: let
+    overlays = [
+      (final: prev: {
+        zigpkgs = inputs.zig.packages.${prev.system};
+      })
+    ];
+    systems = ["x86_64-linux"];
+  in
+    flake-utils.lib.eachSystem systems (
+      system: let
+        pkgs = import nixpkgs {inherit overlays system;};
+      in rec {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            zigpkgs.master
+            zls
+            emscripten
+          ];
+          buildInputs = with pkgs; [
+            sqlite
+
+            # Linux graphical deps
+            xorg.libX11
+            libGL
           ];
-          config = { };
         };
-
-        formatter = pkgs.nixfmt;
-
-        devShells.default = with pkgs;
-          mkShell {
-            buildInputs = [
-              sqlite
-
-              # Zig / webAssembly impl.
-              zig
-              # zigpkgs."master" # Issue with X11/GL libraries
-              zls
-              emscripten
-
-              # Linux graphical deps
-              xorg.libX11
-              libGL
-              # xorg.libXcursor
-              # xorg.libXi
-              # xorg.libXext
-              # xorg.libXrandr
-              # xorg.libXinerama
-              # libGLU
-            ];
-
-          };
-
-      };
-    };
+        formatter = pkgs.alejandra;
+      }
+    );
 }
diff --git a/src/main.zig b/src/main.zig
index 253a226..d7091b6 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,5 +1,11 @@
 const std = @import("std");
-const raylib = @import("raylib.zig");
+const raylib = @cImport({
+    @cInclude("raylib.h");
+});
+const raygui = @cImport({
+    @cDefine("RAYGUI_IMPLEMENTATION", "1");
+    @cInclude("raygui.h");
+});
 const sqlite = @cImport({
     @cInclude("sqlite3.h");
 });
@@ -15,7 +21,7 @@ pub fn main() !void {
 
         raylib.ClearBackground(raylib.RAYWHITE);
         raylib.DrawText("Congrats! You created your first window!", 190, 200, 20, raylib.LIGHTGRAY);
-        if (raylib.GuiButton(.{ .x = 0, .y = 0, .width = 100, .height = 100 }, "MyButton") == 1) {}
+        if (raygui.GuiButton(.{ .x = 0, .y = 0, .width = 100, .height = 100 }, "MyButton") == 1) {}
     }
     raylib.CloseWindow();
 }
diff --git a/src/raylib.zig b/src/raylib.zig
deleted file mode 100644
index e58a659..0000000
--- a/src/raylib.zig
+++ /dev/null
@@ -1,5 +0,0 @@
-pub usingnamespace @cImport({
-    @cInclude("raylib.h");
-    @cDefine("RAYGUI_IMPLEMENTATION", "1");
-    @cInclude("raygui.h");
-});