diff --git a/docs/binding.md b/docs/binding.md
index ccdf8f4..07905ef 100644
--- a/docs/binding.md
+++ b/docs/binding.md
@@ -42,7 +42,7 @@ enum Suit {
 
 Illuminate\Support\Facades\Route::get(
     '/card/{card?}',
-    function (Suit $card = null) {
+    function (Suit|null $card = null) {
         print $card->name ?? 'nothing';
     }
 );
diff --git a/src/Helpers/EnumCheck.php b/src/Helpers/EnumCheck.php
index adee3dc..b9d7bdb 100644
--- a/src/Helpers/EnumCheck.php
+++ b/src/Helpers/EnumCheck.php
@@ -12,7 +12,7 @@
  */
 final class EnumCheck
 {
-    public static function check(UnitEnum|string $enum, string $class = null): void
+    public static function check(UnitEnum|string $enum, string|null $class = null): void
     {
         if (!$enum instanceof UnitEnum && !enum_exists($enum, true)) {
             self::throwError($class);
@@ -28,7 +28,7 @@ public static function matches(string $class, BackedEnum|UnitEnum|string|null ..
         }
     }
 
-    private static function throwError(string $class = null): never
+    private static function throwError(string|null $class = null): never
     {
         $method = 'This method';
 
diff --git a/src/Helpers/EnumProperties.php b/src/Helpers/EnumProperties.php
index a649e87..2fabb1a 100644
--- a/src/Helpers/EnumProperties.php
+++ b/src/Helpers/EnumProperties.php
@@ -92,7 +92,7 @@ public static function global(string $property, mixed $value): mixed
         return self::$global[$property] = $value;
     }
 
-    public static function clear(string $class, string $property = null): void
+    public static function clear(string $class, string|null $property = null): void
     {
         EnumCheck::check($class);
 
@@ -105,7 +105,7 @@ public static function clear(string $class, string $property = null): void
         }
     }
 
-    public static function clearGlobal(string $property = null): void
+    public static function clearGlobal(string|null $property = null): void
     {
         if (!empty($property)) {
             unset(self::$global[$property]);
diff --git a/src/Helpers/EnumValue.php b/src/Helpers/EnumValue.php
index 2f62e43..8fd2ab1 100644
--- a/src/Helpers/EnumValue.php
+++ b/src/Helpers/EnumValue.php
@@ -10,7 +10,7 @@
  */
 final class EnumValue
 {
-    public static function value(UnitEnum $enum, bool $keepCase = null): string|int
+    public static function value(UnitEnum $enum, bool|null $keepCase = null): string|int
     {
         if (is_null($keepCase)) {
             $keepCase = self::isStrict($enum);
diff --git a/src/Laravel/Mixins/RulesMixin.php b/src/Laravel/Mixins/RulesMixin.php
index 16e90b9..efb1982 100644
--- a/src/Laravel/Mixins/RulesMixin.php
+++ b/src/Laravel/Mixins/RulesMixin.php
@@ -28,7 +28,7 @@ public function enumBitmask(): Closure
 
     public function enumTransition(): Closure
     {
-        return function (UnitEnum $currentState, TransitionHook $hook = null): EnumTransition {
+        return function (UnitEnum $currentState, TransitionHook|null $hook = null): EnumTransition {
             return new EnumTransition($currentState, $hook);
         };
     }