diff --git a/src/Authentication/MainCookie.php b/src/Authentication/MainCookie.php
index f224569..e4c8a32 100644
--- a/src/Authentication/MainCookie.php
+++ b/src/Authentication/MainCookie.php
@@ -77,7 +77,7 @@ class MainCookie extends Authenticator
 
     private function newFileName(): string
     {
-        return parent::$path . '/' . time() . '.txt';
+        return parent::$path . '/' . now()->timestamp . '.txt';
     }
 
     private function isExpired(): bool