diff --git a/src/DependencyInjection/NucleosDompdfExtension.php b/src/DependencyInjection/NucleosDompdfExtension.php
index 97db93c6..6b4e3ccd 100644
--- a/src/DependencyInjection/NucleosDompdfExtension.php
+++ b/src/DependencyInjection/NucleosDompdfExtension.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 final class NucleosDompdfExtension extends Extension
 {
diff --git a/src/Wrapper/DompdfWrapper.php b/src/Wrapper/DompdfWrapper.php
index abcedd76..a8674df2 100644
--- a/src/Wrapper/DompdfWrapper.php
+++ b/src/Wrapper/DompdfWrapper.php
@@ -25,7 +25,7 @@ final class DompdfWrapper implements DompdfWrapperInterface
 
     private ?EventDispatcherInterface $eventDispatcher;
 
-    public function __construct(DompdfFactoryInterface $dompdfFactory, EventDispatcherInterface $eventDispatcher = null)
+    public function __construct(DompdfFactoryInterface $dompdfFactory, ?EventDispatcherInterface $eventDispatcher = null)
     {
         $this->dompdfFactory   = $dompdfFactory;
         $this->eventDispatcher = $eventDispatcher;