diff --git a/tests/Api/MailboxesTest.php b/tests/Api/MailboxesTest.php
index b2f8719..5bd1d31 100644
--- a/tests/Api/MailboxesTest.php
+++ b/tests/Api/MailboxesTest.php
@@ -11,7 +11,7 @@ declare(strict_types=1);
 
 namespace Mailgun\Tests\Api;
 
-use GuzzleHttp\Psr7\Response;
+use Nyholm\Psr7\Response;
 use Mailgun\Api\Mailboxes;
 use Mailgun\Exception\InvalidArgumentException;