diff --git a/config/firebase.php b/config/firebase.php
index c40ede0..0a1080b 100644
--- a/config/firebase.php
+++ b/config/firebase.php
@@ -17,6 +17,17 @@
      */
     'projects' => [
         'app' => [
+
+            /**
+             * ------------------------------------------------------------------------
+             * Firebase Authentication
+             * ------------------------------------------------------------------------
+             */
+
+            'authentication' => [
+                'tenant_id' => env('FIREBASE_TENANT_ID'),
+            ],
+
             /*
              * ------------------------------------------------------------------------
              * Credentials / Service Account
diff --git a/src/FirebaseProjectManager.php b/src/FirebaseProjectManager.php
index a92e1fc..672db50 100644
--- a/src/FirebaseProjectManager.php
+++ b/src/FirebaseProjectManager.php
@@ -61,6 +61,10 @@ protected function configure(string $name): FirebaseProject
 
         $config = $this->configuration($name);
 
+        if ($tenantId = $config['authentication']['tenant_id'] ?? null) {
+            $factory = $factory->withTenantId($tenantId);
+        }
+
         if ($credentials = $config['credentials']['file'] ?? null) {
             $resolvedCredentials = $this->resolveCredentials((string) $credentials);