diff --git a/flake.nix b/flake.nix
index a904807..913fc50 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,6 +24,7 @@
         formatter = treefmtEval.config.build.wrapper;
         devShell = mkShell {
           nativeBuildInputs = with pkgs; [
+            p7zip
             tokei
             nil
           ];
diff --git a/package.nix b/package.nix
index be611d6..329d191 100644
--- a/package.nix
+++ b/package.nix
@@ -17,8 +17,8 @@ stdenv.mkDerivation rec {
   version = "0.1.0";
 
   src = fetchurl {
-    url = "https://mdk.cab/download/nonmerged/mu50";
-    sha256 = "sha256-0hzR2EWmamLJrqJ6cXaReEgd8Ha4Sf7LENpIYqcbCgs=";
+    url = "https://web.archive.org/web/20250623025020/https://mdk.cab/download/standalone/mu50.7z";
+    sha256 = "sha256-ZXsMg8T2mVkpN+2oSQ7w+xTovW/WCGlydUdQrPIlECM=";
   };
 
   nativeBuildInputs = [