diff --git a/stubs/inertia/app/Http/Middleware/HandleInertiaRequests.php b/stubs/inertia/app/Http/Middleware/HandleInertiaRequests.php
index 940edfb73..939065fa8 100644
--- a/stubs/inertia/app/Http/Middleware/HandleInertiaRequests.php
+++ b/stubs/inertia/app/Http/Middleware/HandleInertiaRequests.php
@@ -18,7 +18,7 @@ class HandleInertiaRequests extends Middleware
     /**
      * Determine the current asset version.
      */
-    public function version(Request $request): string|null
+    public function version(Request $request): ?string
     {
         return parent::version($request);
     }