diff --git a/app/Http/Controllers/Auth/RegisteredUserController.php b/app/Http/Controllers/Auth/RegisteredUserController.php
index 88dbc08..c0c9454 100644
--- a/app/Http/Controllers/Auth/RegisteredUserController.php
+++ b/app/Http/Controllers/Auth/RegisteredUserController.php
@@ -38,6 +38,7 @@ class RegisteredUserController extends Controller
         $user = User::create([
             'name' => $request->name,
             'email' => $request->email,
+            'department_id' => null,
             'password' => Hash::make($request->password),
         ]);
 
diff --git a/database/factories/UserFactory.php b/database/factories/UserFactory.php
index 15860f5..99d1d1f 100644
--- a/database/factories/UserFactory.php
+++ b/database/factories/UserFactory.php
@@ -16,7 +16,7 @@ class UserFactory extends Factory
             'name' => fake()->name(),
             'email' => fake()->unique()->safeEmail(),
             'email_verified_at' => now(),
-            'department_id' => 1,
+            'department_id' => null,
             'password' => static::$password ??= Hash::make('password'),
             'remember_token' => Str::random(10),
         ];
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 7931a6d..6b85972 100644
--- a/database/migrations/0001_01_01_000000_create_users_table.php
+++ b/database/migrations/0001_01_01_000000_create_users_table.php
@@ -12,7 +12,7 @@ return new class extends Migration
             $table->id();
             $table->string('name');
             $table->string('email')->unique();
-            $table->foreignId('department_id')->constrained('departments');
+            $table->foreignId('department_id')->nullable()->constrained('departments');
             $table->timestamp('email_verified_at')->nullable();
             $table->string('password');
             $table->rememberToken();
diff --git a/tests/Feature/Auth/AuthenticationTest.php b/tests/Feature/Auth/AuthenticationTest.php
index 253f02f..80b6de0 100644
--- a/tests/Feature/Auth/AuthenticationTest.php
+++ b/tests/Feature/Auth/AuthenticationTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;
@@ -10,6 +11,11 @@ class AuthenticationTest extends TestCase
 {
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+        Department::factory()->create();
+    }
     public function testLoginScreenCanBeRendered(): void
     {
         $response = $this->get('/login');
diff --git a/tests/Feature/Auth/EmailVerificationTest.php b/tests/Feature/Auth/EmailVerificationTest.php
index f8ae874..0e2d6e7 100644
--- a/tests/Feature/Auth/EmailVerificationTest.php
+++ b/tests/Feature/Auth/EmailVerificationTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use App\Models\User;
 use Illuminate\Auth\Events\Verified;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -13,6 +14,12 @@ class EmailVerificationTest extends TestCase
 {
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+        Department::factory()->create();
+    }
+
     public function testEmailVerificationScreenCanBeRendered(): void
     {
         $user = User::factory()->unverified()->create();
diff --git a/tests/Feature/Auth/PasswordConfirmationTest.php b/tests/Feature/Auth/PasswordConfirmationTest.php
index 322c2cc..7348201 100644
--- a/tests/Feature/Auth/PasswordConfirmationTest.php
+++ b/tests/Feature/Auth/PasswordConfirmationTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;
@@ -10,6 +11,11 @@ class PasswordConfirmationTest extends TestCase
 {
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+        Department::factory()->create();
+    }
     public function testConfirmPasswordScreenCanBeRendered(): void
     {
         $user = User::factory()->create();
diff --git a/tests/Feature/Auth/PasswordResetTest.php b/tests/Feature/Auth/PasswordResetTest.php
index 5c3f0f1..2c6330b 100644
--- a/tests/Feature/Auth/PasswordResetTest.php
+++ b/tests/Feature/Auth/PasswordResetTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use App\Models\User;
 use Illuminate\Auth\Notifications\ResetPassword;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -12,6 +13,12 @@ class PasswordResetTest extends TestCase
 {
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+        Department::factory()->create();
+    }
+
     public function testResetPasswordLinkScreenCanBeRendered(): void
     {
         $response = $this->get('/forgot-password');
diff --git a/tests/Feature/Auth/PasswordUpdateTest.php b/tests/Feature/Auth/PasswordUpdateTest.php
index b22369c..895ec66 100644
--- a/tests/Feature/Auth/PasswordUpdateTest.php
+++ b/tests/Feature/Auth/PasswordUpdateTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Hash;
@@ -11,6 +12,12 @@ class PasswordUpdateTest extends TestCase
 {
     use RefreshDatabase;
 
+    public function setUp(): void
+    {
+        parent::setUp();
+        Department::factory()->create();
+    }
+
     public function testPasswordCanBeUpdated(): void
     {
         $user = User::factory()->create();
diff --git a/tests/Feature/Auth/RegistrationTest.php b/tests/Feature/Auth/RegistrationTest.php
index 5d86533..3a12ac3 100644
--- a/tests/Feature/Auth/RegistrationTest.php
+++ b/tests/Feature/Auth/RegistrationTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Auth;
 
+use App\Models\Department;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;