diff --git a/app/Http/Requests/Admin/Account/UpdateProfileRequest.php b/app/Http/Requests/Admin/Account/UpdateProfileRequest.php
index 09a6701..889cb2a 100644
--- a/app/Http/Requests/Admin/Account/UpdateProfileRequest.php
+++ b/app/Http/Requests/Admin/Account/UpdateProfileRequest.php
@@ -3,6 +3,7 @@
 namespace App\Http\Requests\Admin\Account;
 
 use App\Enums\Gender;
+use App\Rules\PhoneNumber;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
 
@@ -22,7 +23,7 @@ public function rules(): array
             'email' => ['required', 'email', 'max:100', Rule::unique('users', 'email')->ignore($this->user()?->id)],
             'username' => ['required', 'string', 'max:20', 'alpha_dash', Rule::unique('users', 'username')->ignore($this->user()?->id)],
             'full_name' => ['required', 'string', 'max:200'],
-            'phone_number' => ['nullable', 'string', 'max:20', 'regex:/^08\d{8,11}$/'],
+            'phone_number' => ['nullable', 'string', 'max:20', new PhoneNumber],
             'gender' => ['nullable', Rule::enum(Gender::class)],
             'birth_date' => ['nullable', 'date', 'before:today'],
             'address' => ['nullable', 'string'],
diff --git a/app/Http/Requests/Admin/Hr/EmployeeRequest.php b/app/Http/Requests/Admin/Hr/EmployeeRequest.php
index 6e83490..10e1da4 100644
--- a/app/Http/Requests/Admin/Hr/EmployeeRequest.php
+++ b/app/Http/Requests/Admin/Hr/EmployeeRequest.php
@@ -6,6 +6,7 @@
 use App\Enums\Gender;
 use App\Enums\Permission;
 use App\Enums\Role;
+use App\Rules\PhoneNumber;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
 
@@ -31,7 +32,7 @@ public function rules(): array
             'email' => ['required', 'email', 'max:100', Rule::unique('users', 'email')->ignore($this->route('user')?->id)],
             'username' => ['required', 'string', 'max:20', 'alpha_dash', Rule::unique('users', 'username')->ignore($this->route('user')?->id)],
             'full_name' => ['required', 'string', 'max:200'],
-            'phone_number' => ['nullable', 'string', 'max:20', 'regex:/^08\d{8,11}$/'],
+            'phone_number' => ['nullable', 'string', 'max:20', new PhoneNumber],
             'gender' => ['nullable', Rule::enum(Gender::class)],
             'birth_date' => ['nullable', 'date', 'before:today'],
             'address' => ['nullable', 'string'],
diff --git a/app/Http/Requests/Admin/Master/CustomerRequest.php b/app/Http/Requests/Admin/Master/CustomerRequest.php
index d9df170..cf42763 100644
--- a/app/Http/Requests/Admin/Master/CustomerRequest.php
+++ b/app/Http/Requests/Admin/Master/CustomerRequest.php
@@ -3,6 +3,7 @@
 namespace App\Http\Requests\Admin\Master;
 
 use App\Enums\Permission;
+use App\Rules\PhoneNumber;
 use Illuminate\Foundation\Http\FormRequest;
 
 class CustomerRequest extends FormRequest
@@ -23,7 +24,7 @@ public function rules(): array
     {
         return [
             'name' => ['required', 'string', 'max:200'],
-            'phone_number' => ['nullable', 'string', 'max:20'],
+            'phone_number' => ['nullable', 'string', 'max:20', new PhoneNumber],
             'address' => ['nullable', 'string'],
         ];
     }
diff --git a/app/Http/Requests/Admin/Master/SupplierRequest.php b/app/Http/Requests/Admin/Master/SupplierRequest.php
index 11de518..9be85ef 100644
--- a/app/Http/Requests/Admin/Master/SupplierRequest.php
+++ b/app/Http/Requests/Admin/Master/SupplierRequest.php
@@ -3,6 +3,7 @@
 namespace App\Http\Requests\Admin\Master;
 
 use App\Enums\Permission;
+use App\Rules\PhoneNumber;
 use Illuminate\Foundation\Http\FormRequest;
 
 class SupplierRequest extends FormRequest
@@ -23,7 +24,7 @@ public function rules(): array
     {
         return [
             'name' => ['required', 'string', 'max:200'],
-            'phone_number' => ['nullable', 'string', 'max:20'],
+            'phone_number' => ['nullable', 'string', 'max:20', new PhoneNumber],
             'address' => ['nullable', 'string'],
         ];
     }
diff --git a/app/Http/Requests/Admin/System/Setting/SystemRequest.php b/app/Http/Requests/Admin/System/Setting/SystemRequest.php
index 21bd19c..7ed61f6 100644
--- a/app/Http/Requests/Admin/System/Setting/SystemRequest.php
+++ b/app/Http/Requests/Admin/System/Setting/SystemRequest.php
@@ -3,6 +3,7 @@
 namespace App\Http\Requests\Admin\System\Setting;
 
 use App\Enums\Permission;
+use App\Rules\PhoneNumber;
 use Illuminate\Foundation\Http\FormRequest;
 
 class SystemRequest extends FormRequest
@@ -21,7 +22,7 @@ public function rules(): array
             'app_name' => ['required', 'string', 'max:100'],
             'about_app' => ['required', 'string'],
             'email' => ['required', 'email', 'max:100'],
-            'phone' => ['required', 'string', 'max:20'],
+            'phone' => ['required', 'string', 'max:20', new PhoneNumber],
             'address' => ['required', 'string'],
             'logo' => ['required', 'image', 'max:2048'],
             'login_cover' => ['required', 'image', 'max:5120'],
diff --git a/app/Rules/PhoneNumber.php b/app/Rules/PhoneNumber.php
new file mode 100644
index 0000000..6f21cf6
--- /dev/null
+++ b/app/Rules/PhoneNumber.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class PhoneNumber implements ValidationRule
+{
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! preg_match('/^08\d{8,11}$/', $value)) {
+            $fail('Nomor telepon harus diawali dengan 08 dan terdiri dari 10-13 digit.');
+        }
+    }
+}