diff --git a/src/Utils/Utils.php b/src/Utils/Utils.php
index 762e946d..e1f89d92 100644
--- a/src/Utils/Utils.php
+++ b/src/Utils/Utils.php
@@ -199,7 +199,7 @@ public static function randomPublicId($prefix = '')
      *
      * @return false|UriInterface
      */
-    public static function tryParseUrl($url, array $allowedSchemes = null)
+    public static function tryParseUrl($url, ?array $allowedSchemes = null)
     {
         if (! $url instanceof UriInterface) {
             if (! is_string($url)) {