diff --git a/flake.lock b/flake.lock
index fd4dffe..64699f5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,30 +1,12 @@
 {
   "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1732238832,
-        "narHash": "sha256-sQxuJm8rHY20xq6Ah+GwIUkF95tWjGRd1X8xF+Pkk38=",
+        "lastModified": 1732617236,
+        "narHash": "sha256-PYkz6U0bSEaEB1al7O1XsqVNeSNS+s3NVclJw7YC43w=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8edf06bea5bcbee082df1b7369ff973b91618b8d",
+        "rev": "af51545ec9a44eadf3fe3547610a5cdd882bc34e",
         "type": "github"
       },
       "original": {
@@ -36,7 +18,6 @@
     },
     "root": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }
@@ -48,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1732328983,
-        "narHash": "sha256-RHt12f/slrzDpSL7SSkydh8wUE4Nr4r23HlpWywed9E=",
+        "lastModified": 1732674798,
+        "narHash": "sha256-oM1gjCv9R4zxDFO3as9wqQ4FI3+pDA9MKZ72L7tTIII=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "ed8aa5b64f7d36d9338eb1d0a3bb60cf52069a72",
+        "rev": "1d569430326b0a7807ccffdb2a188b814091976c",
         "type": "github"
       },
       "original": {
@@ -60,21 +41,6 @@
         "repo": "rust-overlay",
         "type": "github"
       }
-    },
-    "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 7d3f567..86d31f2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,67 +3,68 @@
 
     inputs = {
         nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-        flake-utils.url = "github:numtide/flake-utils";
         rust-overlay = {
             url = "github:oxalica/rust-overlay";
             inputs.nixpkgs.follows = "nixpkgs";
         };
     };
 
-    outputs = { nixpkgs, flake-utils, rust-overlay, ... }:
-        flake-utils.lib.eachDefaultSystem (system:
-            let
-                overlays = [ (import rust-overlay) ];
-                pkgs = import nixpkgs { inherit system overlays; };
-                lib = nixpkgs.lib;
-                rust = pkgs.rust-bin;
+    outputs = { nixpkgs, rust-overlay, ... }:
+    let
+        lib = nixpkgs.lib;
+        systems = ["x86_64-linux"];
+        forEachSystem = fn: lib.genAttrs systems (system: let
+            overlays = [ (import rust-overlay) ];
+            pkgs = import nixpkgs { inherit system overlays; };
+            rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        in fn { inherit pkgs rustToolchain; } );
+    in {
+        packages = forEachSystem ({ pkgs, rustToolchain }: let
+            rustPlatform = pkgs.makeRustPlatform {
+                cargo = rustToolchain;
+                rustc = rustToolchain;
+            };
 
-                rustToolchain = rust.fromRustupToolchainFile ./rust-toolchain.toml;
-                rustNightlyToolchain = rust.selectLatestNightlyWith (t: t.minimal.override {
-                    extensions = [ "rustfmt" ];
-                });
-                rustPlatform = pkgs.makeRustPlatform {
-                    cargo = rustToolchain;
-                    rustc = rustToolchain;
+            manifest = lib.importTOML ./Cargo.toml;
+            packageName = manifest.package.name;
+            packageVersion = manifest.package.version;
+
+            package = rustPlatform.buildRustPackage {
+                nativeBuildInputs = [ rustToolchain ];
+
+                pname = packageName;
+                version = packageVersion;
+                src = lib.cleanSource ./.;
+
+                verbose = true;
+
+                cargoLock = {
+                    lockFile = ./Cargo.lock;
+                    allowBuiltinFetchGit = true;
                 };
 
-                buildTools = [
+                meta = {
+                    mainProgram = packageName;
+                };
+            };
+        in {
+            default = package;
+            ${packageName} = package;
+        });
+
+        devShells = forEachSystem ({ pkgs, rustToolchain }: let
+            rustNightlyToolchain = pkgs.rust-bin.selectLatestNightlyWith (t: t.minimal.override {
+                extensions = [ "rustfmt" ];
+            });
+        in {
+            default = pkgs.mkShell {
+                name = "projtool";
+
+                nativeBuildInputs = [
                     rustToolchain
                     rustNightlyToolchain
                 ];
-
-                manifest = lib.importTOML ./Cargo.toml;
-                packageName = manifest.package.name;
-                packageVersion = manifest.package.version;
-
-                package = rustPlatform.buildRustPackage {
-                    nativeBuildInputs = buildTools;
-
-                    pname = packageName;
-                    version = packageVersion;
-                    src = lib.cleanSource ./.;
-
-                    verbose = true;
-
-                    cargoLock = {
-                        lockFile = ./Cargo.lock;
-                        allowBuiltinFetchGit = true;
-                    };
-
-                    meta = {
-                        mainProgram = packageName;
-                    };
-                };
-            in {
-                packages = {
-                    default = package;
-                    ${packageName} = package;
-                };
-
-                devShells.default = pkgs.mkShell {
-                    name = "projtool";
-
-                    nativeBuildInputs = buildTools;
-                };
-            });
+            };
+        });
+    };
 }