diff --git a/pint.json b/pint.json
index b59230b0..19f1ab5e 100644
--- a/pint.json
+++ b/pint.json
@@ -84,6 +84,7 @@
         "property": "none",
         "trait_import": "none"
       }
-    }
+    },
+    "new_with_parentheses": true
   }
 }
diff --git a/src/Casts/MachineCast.php b/src/Casts/MachineCast.php
index 0a77bc14..a2443710 100644
--- a/src/Casts/MachineCast.php
+++ b/src/Casts/MachineCast.php
@@ -54,8 +54,12 @@ public function get(
      * @param  TSet|null  $value
      * @param  array<mixed>  $attributes
      */
-    public function set(Model $model, string $key, mixed $value, array $attributes): string
+    public function set(Model $model, string $key, mixed $value, array $attributes): ?string
     {
+        if ($value === null) {
+            return null;
+        }
+
         if (is_string($value)) {
             return $value;
         }
diff --git a/tests/ActionTest.php b/tests/ActionTest.php
index 82655e01..0719124e 100644
--- a/tests/ActionTest.php
+++ b/tests/ActionTest.php
@@ -91,7 +91,7 @@
     // 1. Arrange
     $value = random_int(10, 20);
 
-    $multipleWithItselfAction = new class extends ResultBehavior {
+    $multipleWithItselfAction = new class() extends ResultBehavior {
         public function __invoke(EventBehavior $event): int
         {
             return $event->payload['value'] * $event->payload['value'];