diff --git a/tests/CartItemTest.php b/tests/CartItemTest.php
index e9dc32b..ff82821 100644
--- a/tests/CartItemTest.php
+++ b/tests/CartItemTest.php
@@ -6,6 +6,7 @@ use Gloudemans\Shoppingcart\CartItem;
 use Gloudemans\Shoppingcart\ShoppingcartServiceProvider;
 use Orchestra\Testbench\TestCase;
 use Money\Money;
+use Money\Currency;
 
 class CartItemTest extends TestCase
 {
@@ -24,7 +25,7 @@ class CartItemTest extends TestCase
     /** @test */
     public function it_can_be_cast_to_an_array()
     {
-        $cartItem = new CartItem(1, 'Some item', new Money(10.00, 'USD'), 550, ['size' => 'XL', 'color' => 'red']);
+        $cartItem = new CartItem(1, 'Some item', new Money(10.00, new Currency('USD')), 550, ['size' => 'XL', 'color' => 'red']);
         $cartItem->setQuantity(2);
 
         $this->assertEquals([
@@ -47,7 +48,7 @@ class CartItemTest extends TestCase
     /** @test */
     public function it_can_be_cast_to_json()
     {
-        $cartItem = new CartItem(1, 'Some item', new Money(10.00, 'USD'), 550, ['size' => 'XL', 'color' => 'red']);
+        $cartItem = new CartItem(1, 'Some item', new Money(10.00, new Currency('USD')), 550, ['size' => 'XL', 'color' => 'red']);
         $cartItem->setQuantity(2);
 
         $this->assertJson($cartItem->toJson());
@@ -60,7 +61,7 @@ class CartItemTest extends TestCase
     /** @test */
     public function it_formats_price_total_correctly()
     {
-        $cartItem = new CartItem(1, 'Some item', new Money(10.00, 'USD'), 550, ['size' => 'XL', 'color' => 'red']);
+        $cartItem = new CartItem(1, 'Some item', new Money(10.00, new Currency('USD')), 550, ['size' => 'XL', 'color' => 'red']);
         $cartItem->setQuantity(2);
 
         $this->assertSame('20.00', $cartItem->priceTotal());