diff --git a/Component/EntitiesSelector.php b/Component/EntitiesSelector.php
index cd94f40..dbda414 100644
--- a/Component/EntitiesSelector.php
+++ b/Component/EntitiesSelector.php
@@ -101,7 +101,7 @@ public function __construct(
         ContextInterface $context,
         UrlInterface $urlBuilder,
         UiComponentGenerator $uiComponentGenerator,
-        ArrayManager $arrayManager = null,
+        ?ArrayManager $arrayManager = null,
         array $components = [],
         array $data = [],
         array $requiredColumnFields = []
diff --git a/DataProvider/Widget/DataProvider.php b/DataProvider/Widget/DataProvider.php
index 612f33c..074494f 100644
--- a/DataProvider/Widget/DataProvider.php
+++ b/DataProvider/Widget/DataProvider.php
@@ -24,7 +24,7 @@ public function __construct(
         $name,
         array $meta = [],
         array $data = [],
-        PoolInterface $pool = null
+        ?PoolInterface $pool = null
     ) {
         parent::__construct(
             $name,