diff --git a/app/Http/Controllers/SpLetterController.php b/app/Http/Controllers/SpLetterController.php
index 9ac948e..4dcb5e0 100644
--- a/app/Http/Controllers/SpLetterController.php
+++ b/app/Http/Controllers/SpLetterController.php
@@ -60,7 +60,7 @@ class SpLetterController extends Controller
         $pdf = Pdf::loadView('sp-letters.print', compact('spLetter', 'school', 'forPdf'))
             ->setPaper([0, 0, 595.28, 935.43], 'portrait'); // F4 (210×330 mm)
 
-        $filename = 'SP-'.Str::slug(str_replace(['/', '\\'], '-', $spLetter->letter_number)).'.pdf';
+        $filename = 'SP-'.Str::slug(str_replace(['/', '\\'], '-', $spLetter->letter_number)).'-'.now()->format('Ymd-His').'.pdf';
 
         return $pdf->download($filename);
     }