diff -u b/src/JsonapiServiceProvider.php b/src/JsonapiServiceProvider.php
--- b/src/JsonapiServiceProvider.php
+++ b/src/JsonapiServiceProvider.php
@@ -7,7 +7,6 @@
 use Drupal\Core\DependencyInjection\ServiceProviderInterface;
 use Drupal\Core\StackMiddleware\NegotiationMiddleware;
 use Drupal\jsonapi\DependencyInjection\Compiler\RegisterSerializationClassesCompilerPass;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**