diff --git a/README.md b/README.md
index 67e9df0..7661d05 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,8 @@
 </p>
 
 ## Built with
-- [Laravel 11](https://github.com/laravel/framework)
+- [Laravel 12](https://github.com/laravel/framework)
 - [spatie/laravel-permission](https://github.com/spatie/laravel-permission)
-- [Laravel Breeze](https://github.com/laravel/breeze)
 - [balajidharma/laravel-menu](https://github.com/balajidharma/laravel-menu)
 - [Vue 3](https://vuejs.org/)
 - [Tailwind CSS](https://tailwindcss.com/)
diff --git a/app/Models/User.php b/app/Models/User.php
index 7576d0d..8837b48 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -6,6 +6,7 @@
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
+use Illuminate\Support\Str;
 use Spatie\Permission\Traits\HasRoles;
 
 class User extends Authenticatable
@@ -20,6 +21,7 @@ class User extends Authenticatable
     protected $fillable = [
         'name',
         'email',
+        'username',
         'password',
     ];
 
@@ -41,4 +43,60 @@ class User extends Authenticatable
     protected $casts = [
         'email_verified_at' => 'datetime',
     ];
+
+    public static function boot()
+    {
+        parent::boot();
+
+        static::saving(function ($model) {
+            $model->setUsername();
+        });
+    }
+
+    protected function usernameExists(string $username): bool
+    {
+        return self::where('username', $username)->exists();
+    }
+
+    public function setUsername(): void
+    {
+        // Early return if username is already set
+        if ($this->username) {
+            return;
+        }
+
+        $baseUsername = $this->generateBaseUsername();
+        $this->username = $this->generateUniqueUsername($baseUsername);
+    }
+
+    private function generateBaseUsername(): string
+    {
+        return Str::of($this->name)
+            ->ascii()
+            ->lower()
+            ->replaceMatches('/[\s._-]+/', '') // Replace multiple special characters at once
+            ->trim();
+    }
+
+    private function generateUniqueUsername(string $baseUsername): string
+    {
+        $username = $baseUsername;
+
+        // If base username is already unique, return it
+        if (! $this->usernameExists($username)) {
+            return $username;
+        }
+
+        // Generate a random suffix between 100000 and 999999
+        $suffix = random_int(100000, 999999);
+        $username = $baseUsername.$suffix;
+
+        // In the unlikely case of collision, increment until unique
+        while ($this->usernameExists($username)) {
+            $suffix++;
+            $username = $baseUsername.$suffix;
+        }
+
+        return $username;
+    }
 }
diff --git a/composer.json b/composer.json
index 05bfc98..9e376fd 100644
--- a/composer.json
+++ b/composer.json
@@ -6,23 +6,22 @@
     "license": "MIT",
     "require": {
         "php": "^8.2",
-        "balajidharma/laravel-admin-core": "^2.0",
-        "inertiajs/inertia-laravel": "^1.0",
-        "laravel/framework": "^11.0",
+        "balajidharma/laravel-admin-core": "^3.0",
+        "inertiajs/inertia-laravel": "^2.0",
+        "laravel/framework": "^12.0",
         "laravel/sanctum": "^4.0",
-        "laravel/tinker": "^2.9",
-        "tightenco/ziggy": "^2.0"
+        "laravel/tinker": "^2.10.1",
+        "tightenco/ziggy": "^2.4"
     },
     "require-dev": {
         "barryvdh/laravel-debugbar": "^3.7",
         "fakerphp/faker": "^1.23",
-        "laravel/breeze": "^2.0",
-        "laravel/pint": "^1.13",
-        "laravel/sail": "^1.26",
+        "laravel/pail": "^1.2.2",
+        "laravel/pint": "^1.18",
+        "laravel/sail": "^1.41",
         "mockery/mockery": "^1.6",
-        "nunomaduro/collision": "^8.1",
-        "phpunit/phpunit": "^10.5",
-        "spatie/laravel-ignition": "^2.4"
+        "nunomaduro/collision": "^8.6",
+        "phpunit/phpunit": "^11.5.3"
     },
     "autoload": {
         "psr-4": {
diff --git a/database/migrations/0001_01_01_000000_create_users_table.php b/database/migrations/0001_01_01_000000_create_users_table.php
index 27ee603..b7947a6 100644
--- a/database/migrations/0001_01_01_000000_create_users_table.php
+++ b/database/migrations/0001_01_01_000000_create_users_table.php
@@ -15,6 +15,7 @@ public function up(): void
             $table->id();
             $table->string('name');
             $table->string('email')->unique();
+            $table->string('username')->unique();
             $table->timestamp('email_verified_at')->nullable();
             $table->string('password');
             $table->rememberToken();
diff --git a/resources/js/Pages/Admin/Category/Item/Create.vue b/resources/js/Pages/Admin/Category/Item/Create.vue
index d8dc1a9..198d46b 100644
--- a/resources/js/Pages/Admin/Category/Item/Create.vue
+++ b/resources/js/Pages/Admin/Category/Item/Create.vue
@@ -93,6 +93,7 @@ const form = useForm({
           :options="{ enabled: 'Enabled' }"
         />
         <FormField
+          v-if="!categoryType.is_flat"
           label="Parent Item"
           :class="{ 'text-red-400': form.errors.parent_id }"
         >
diff --git a/resources/js/Pages/Admin/Category/Item/Edit.vue b/resources/js/Pages/Admin/Category/Item/Edit.vue
index 4e5cff6..7c01458 100644
--- a/resources/js/Pages/Admin/Category/Item/Edit.vue
+++ b/resources/js/Pages/Admin/Category/Item/Edit.vue
@@ -98,6 +98,7 @@ const form = useForm({
           :options="{ enabled: 'Enabled' }"
         />
         <FormField
+          v-if="!categoryType.is_flat"
           label="Parent Item"
           :class="{ 'text-red-400': form.errors.parent_id }"
         >