diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..581619f
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1707092692,
+        "narHash": "sha256-ZbHsm+mGk/izkWtT4xwwqz38fdlwu7nUUKXTOmm4SyE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "faf912b086576fd1a15fca610166c98d47bc667e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 8388228..2db174c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,23 +5,24 @@
 		nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 	};
 
-	outputs = { self, nixpkgs, stdenv } @inputs:
+	outputs = { self, nixpkgs } @inputs:
 		let
 			system = "x86_64-linux";
 			pkgs   = nixpkgs.legacyPackages.${system};
-			lib    = pkgs.lib;
+			lib    = nixpkgs.lib;
 		in {
-			packages.${system}.default = {
+			packages.${system}.default = pkgs.stdenv.mkDerivation rec {
 				pname   = "Sample Package";
 				version = "1.0";
 
 				# Fetch sources.
-				src = fetchGit {
-					url = "https://git.voronind.com/voronind/nixos_sample_package.git";
+				src = pkgs.fetchurl {
+					url  = "https://git.voronind.com/voronind/nixos_sample_package/archive/v1.tar.gz";
+					hash = "sha256-zAXcCiRqOgMBChqabFjCmAaux1Yb9N+Y5jcE22zT3OI=";
 				};
 
 				# Bins go here.
-				nativeBuildInputs = [
+				nativeBuildInputs = with pkgs; [
 					cargo
 					rustc
 				];
@@ -36,8 +37,8 @@
 				'';
 
 				installPhase = ''
-					mkdir -p ${out}/bin
-					cp target/release/nixos_sample_package ${out}/bin
+					mkdir -p $out/bin
+					cp target/release/nixos_sample_package $out/bin
 				'';
 			};
 		};