diff --git a/Handler/OnRequest.php b/Handler/OnRequest.php
index c895719..1fc602d 100644
--- a/Handler/OnRequest.php
+++ b/Handler/OnRequest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kiri\Server\Handler;
 
 use Exception;