diff --git a/tests/Unit/Transactions/Builder/UsernameRegistrationTest.php b/tests/Unit/Transactions/Builder/UsernameRegistrationTest.php
index c63546b..bb7c029 100644
--- a/tests/Unit/Transactions/Builder/UsernameRegistrationTest.php
+++ b/tests/Unit/Transactions/Builder/UsernameRegistrationTest.php
@@ -15,7 +15,6 @@
 
 use ArkEcosystem\Crypto\Identities\PublicKey;
 use ArkEcosystem\Crypto\Transactions\Builder\UsernameRegistrationBuilder;
-use ArkEcosystem\Crypto\Transactions\Serializer;
 use ArkEcosystem\Tests\Crypto\TestCase;
 
 /**