diff --git a/src/App/Http/Controllers/AttachmentController.php b/src/App/Http/Controllers/AttachmentController.php
index 7b46a82..f99b06d 100644
--- a/src/App/Http/Controllers/AttachmentController.php
+++ b/src/App/Http/Controllers/AttachmentController.php
@@ -6,6 +6,7 @@
 
 use Asseco\Attachments\App\Contracts\Attachment as AttachmentContract;
 use Asseco\Attachments\App\Http\Requests\AttachmentRequest;
+use Asseco\Attachments\App\Http\Requests\AttachmentUpdateRequest;
 use Asseco\Attachments\App\Models\Attachment;
 use Exception;
 use Illuminate\Http\JsonResponse;
@@ -66,7 +67,7 @@ public function show(Attachment $attachment): JsonResponse
      * @param  AttachmentRequest  $request
      * @return JsonResponse
      */
-    public function update(Attachment $attachment, AttachmentRequest $request): JsonResponse
+    public function update(Attachment $attachment, AttachmentUpdateRequest $request): JsonResponse
     {
         $attachment->update($request->validated());
 
diff --git a/src/App/Http/Requests/AttachmentUpdateRequest.php b/src/App/Http/Requests/AttachmentUpdateRequest.php
new file mode 100644
index 0000000..96a3270
--- /dev/null
+++ b/src/App/Http/Requests/AttachmentUpdateRequest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Asseco\Attachments\App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class AttachmentUpdateRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'filing_purpose_id' => 'required|string|exists:filing_purposes,id',
+        ];
+    }
+}