diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 60ec9ea..03fc702 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -17,8 +17,14 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('miracode_stripe');
+        $treeBuilder = new TreeBuilder('miracode_stripe');
+        
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // for symfony/config 4.1 and older
+            $rootNode = $treeBuilder->root('miracode_stripe');
+        }
 
         $supportedDrivers = array('orm', /** coming soon) */);
 
diff --git a/Event/StripeEvent.php b/Event/StripeEvent.php
index a4c2fe8..022cb07 100644
--- a/Event/StripeEvent.php
+++ b/Event/StripeEvent.php
@@ -4,7 +4,7 @@
 
 use Miracode\StripeBundle\StripeException;
 use Stripe\StripeObject;
-use Symfony\Component\EventDispatcher\Event;
+use Symfony\Contracts\EventDispatcher\Event;
 
 class StripeEvent extends Event
 {