diff --git a/EventDispatch.php b/EventDispatch.php
index 9dbf985..bced84c 100644
--- a/EventDispatch.php
+++ b/EventDispatch.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Kiri\Events;
 
diff --git a/EventProvider.php b/EventProvider.php
index 659800d..fd56e2e 100644
--- a/EventProvider.php
+++ b/EventProvider.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Kiri\Events;