diff --git a/tests/AuthenticationTest.php b/tests/AuthenticationTest.php
index 9acb32a34..8be48a276 100644
--- a/tests/AuthenticationTest.php
+++ b/tests/AuthenticationTest.php
@@ -4,6 +4,7 @@
 
 namespace SellingPartnerApi\Tests;
 
+use DateTimeImmutable;
 use PHPUnit\Framework\TestCase;
 use Saloon\Config;
 use Saloon\Exceptions\Request\Statuses\UnauthorizedException;
diff --git a/tests/InMemoryTokenCacheTest.php b/tests/InMemoryTokenCacheTest.php
index cafd1a47b..d7e24a241 100644
--- a/tests/InMemoryTokenCacheTest.php
+++ b/tests/InMemoryTokenCacheTest.php
@@ -4,6 +4,7 @@
 
 namespace SellingPartnerApi\Tests;
 
+use DateTimeImmutable;
 use PHPUnit\Framework\TestCase;
 use SellingPartnerApi\Authentication\AccessTokenAuthenticator;
 use SellingPartnerApi\Authentication\InMemoryTokenCache;
diff --git a/tests/Seller/FBAInboundV0/Requests/UpdateInboundShipmentTest.php b/tests/Seller/FBAInboundV0/Requests/UpdateInboundShipmentTest.php
index e32c37403..37a9bc108 100644
--- a/tests/Seller/FBAInboundV0/Requests/UpdateInboundShipmentTest.php
+++ b/tests/Seller/FBAInboundV0/Requests/UpdateInboundShipmentTest.php
@@ -64,7 +64,7 @@ public function testHasJsonBody(): void
         );
         $connector->withMockClient($mockClient);
 
-        $dto = $connector->fbaInboundV0()->updateInboundShipment(123456, new InboundShipmentRequest(
+        $dto = $connector->fbaInboundV0()->updateInboundShipment('123456', new InboundShipmentRequest(
             inboundShipmentHeader: new InboundShipmentHeader(
                 shipmentName: 'shipment-name',
                 shipFromAddress: new Address(
diff --git a/tests/SerializationTest.php b/tests/SerializationTest.php
index c9eeeef5f..21ee64477 100644
--- a/tests/SerializationTest.php
+++ b/tests/SerializationTest.php
@@ -4,6 +4,7 @@
 
 namespace SellingPartnerApi\Tests;
 
+use DateTimeImmutable;
 use PHPUnit\Framework\TestCase;
 use Saloon\Http\Faking\MockClient;
 use Saloon\Http\Faking\MockResponse;
diff --git a/tests/TokenCacheTest.php b/tests/TokenCacheTest.php
index d9a0ab284..ebdd4dc09 100644
--- a/tests/TokenCacheTest.php
+++ b/tests/TokenCacheTest.php
@@ -4,6 +4,7 @@
 
 namespace SellingPartnerApi\Tests;
 
+use Faker;
 use PHPUnit\Framework\TestCase;
 use Saloon\Config;
 use Saloon\Http\Faking\MockClient;