diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..2e84079
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1695806987,
+        "narHash": "sha256-fX5kGs66NZIxCMcpAGIpxuftajHL8Hil1vjHmjjl118=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "f3dab3509afca932f3f4fd0908957709bb1c1f57",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 3550bb8..3577a41 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,9 +11,9 @@
     packages.x86_64-linux.default = pkgs.stdenv.mkDerivation rec {
       pname = "tailwind-ctp";
       version = "3.3.3";
-      src = fetchurl {
+      src = pkgs.fetchurl {
         url = "https://git.jojodev.com/jolheiser/tailwind-ctp/releases/download/v${version}/tailwind-ctp";
-        hash = "";
+        hash = "sha256-sS6TjtKhe6qwDPj4zzDjXfp/90Cpcg8AOtjQHoX/PSo=";
       };
       dontUnpack = true;
       dontConfigure = true;