diff --git a/src/MenuGroup.php b/src/MenuGroup.php
index d522e7c..0d4aaa1 100644
--- a/src/MenuGroup.php
+++ b/src/MenuGroup.php
@@ -17,7 +17,7 @@ class MenuGroup extends MenuElement
     public function __construct(
         Closure|string $label,
         protected iterable $items = [],
-        string $icon = null,
+        ?string $icon = null,
     ) {
         parent::__construct();
 
diff --git a/src/MenuItem.php b/src/MenuItem.php
index 063a3a2..cd8f249 100644
--- a/src/MenuItem.php
+++ b/src/MenuItem.php
@@ -33,7 +33,7 @@ class MenuItem extends MenuElement
     final public function __construct(
         Closure|string $label,
         protected Closure|MenuFillerContract|string $filler,
-        string $icon = null,
+        ?string $icon = null,
         Closure|bool $blank = false
     ) {
         parent::__construct();