diff --git a/app/Http/Middleware/UniversalTenancy.php b/app/Http/Middleware/UniversalTenancy.php
new file mode 100644
index 0000000..59165c9
--- /dev/null
+++ b/app/Http/Middleware/UniversalTenancy.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Stancl\Tenancy\Middleware\InitializeTenancyByDomain;
+use Symfony\Component\HttpFoundation\Response;
+
+class UniversalTenancy
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        // 判斷是否為中央域名
+        $centralDomains = config('tenancy.central_domains', []);
+
+        if (in_array($request->getHost(), $centralDomains)) {
+            // 如果是中央域名，不進行租戶初始化，直接繼續往下執行 (使用預設資料庫)
+            return $next($request);
+        }
+
+        // 如果不是中央域名，嘗試透過域名初始化租戶
+        // 若找不到租戶，InitializeTenancyByDomain 會拋出異常 (這正是我們要的，避免未授權訪問)
+        return app(InitializeTenancyByDomain::class)->handle($request, $next);
+    }
+}
diff --git a/bootstrap/app.php b/bootstrap/app.php
index 06ccc47..c194374 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -15,7 +15,7 @@ return Application::configure(basePath: dirname(__DIR__))
     )
     ->withMiddleware(function (Middleware $middleware): void {
         $middleware->web(append: [
-            \Stancl\Tenancy\Middleware\InitializeTenancyByDomainOrSubdomain::class,
+            \App\Http\Middleware\UniversalTenancy::class,
             \App\Http\Middleware\HandleInertiaRequests::class,
         ]);