diff --git a/rector.php b/rector.php
index 95d0f650..bc79db5c 100644
--- a/rector.php
+++ b/rector.php
@@ -38,7 +38,7 @@
         SetList::DEAD_CODE,
         SetList::CODING_STYLE,
         SetList::TYPE_DECLARATION,
-//        SetList::TYPE_DECLARATION_STRICT,
+        SetList::TYPE_DECLARATION_STRICT,
     ]);
 
     // Symfony rules