diff --git a/database/seeders/PermissionSeeder.php b/database/seeders/PermissionSeeder.php
index 8ed4bca..4ffdf3d 100644
--- a/database/seeders/PermissionSeeder.php
+++ b/database/seeders/PermissionSeeder.php
@@ -63,15 +63,16 @@ class PermissionSeeder extends Seeder
         ];
 
         foreach ($permissions as $permission) {
-            Permission::create(['name' => $permission]);
+            Permission::firstOrCreate(['name' => $permission]);
         }
 
         // 建立角色
-        $superAdmin = Role::create(['name' => 'super-admin', 'display_name' => '系統管理員']);
-        $admin = Role::create(['name' => 'admin', 'display_name' => '一般管理員']);
-        $warehouseManager = Role::create(['name' => 'warehouse-manager', 'display_name' => '倉庫管理員']);
-        $purchaser = Role::create(['name' => 'purchaser', 'display_name' => '採購人員']);
-        $viewer = Role::create(['name' => 'viewer', 'display_name' => '檢視人員']);
+        $superAdmin = Role::firstOrCreate(['name' => 'super-admin'], ['display_name' => '系統管理員']);
+        $admin = Role::firstOrCreate(['name' => 'admin'], ['display_name' => '一般管理員']);
+        $warehouseManager = Role::firstOrCreate(['name' => 'warehouse-manager'], ['display_name' => '倉庫管理員']);
+        $purchaser = Role::firstOrCreate(['name' => 'purchaser'], ['display_name' => '採購人員']);
+        $viewer = Role::firstOrCreate(['name' => 'viewer'], ['display_name' => '檢視人員']);
+
 
         // 給角色分配權限
         // super-admin 擁有所有權限