diff --git a/.composer-require-checker.json b/.composer-require-checker.json
index e8d4304..8d74fee 100644
--- a/.composer-require-checker.json
+++ b/.composer-require-checker.json
@@ -1,6 +1,6 @@
 {
   "symbol-whitelist": [
-    "array", "bool", "false", "int", "null", "self", "static", "parent", "string", "true", "void",
+    "array", "bool", "false", "int", "null", "self", "static", "parent", "string", "true", "void", "mixed",
     "ampersand", "array_insert", "array_is_assoc", "nl2br_html5", "TL_ERROR",
     "BackendTemplate",
     "ContaoCommunityAlliance\\Contao\\Bindings\\ContaoEvents",
@@ -10,12 +10,16 @@
     "Contao\\ManagerPlugin\\Bundle\\Config\\BundleConfig",
     "Contao\\ManagerPlugin\\Bundle\\Parser\\ParserInterface",
     "Doctrine\\DBAL\\Connection", "FrontendUser", "Symfony\\Component\\Config\\FileLocator",
+    "Doctrine\\DBAL\\Platforms\\AbstractPlatform",
+    "Psr\\EventDispatcher\\EventDispatcherInterface",
     "Symfony\\Component\\DependencyInjection\\ContainerBuilder",
     "Symfony\\Component\\DependencyInjection\\Extension\\Extension",
     "Symfony\\Component\\DependencyInjection\\Loader\\YamlFileLoader",
+    "Symfony\\Component\\Filesystem\\Filesystem",
     "Symfony\\Component\\HttpFoundation\\Request",
     "Symfony\\Component\\HttpFoundation\\RequestStack",
     "Symfony\\Component\\HttpKernel\\Bundle\\Bundle",
+    "Symfony\\Contracts\\EventDispatcher\\EventDispatcherInterface",
     "Symfony\\Contracts\\Translation\\TranslatorInterface"
   ]
 }
diff --git a/src/View/ActionHandler/DeleteHandler.php b/src/View/ActionHandler/DeleteHandler.php
index 1c9e263..c7d1cdf 100644
--- a/src/View/ActionHandler/DeleteHandler.php
+++ b/src/View/ActionHandler/DeleteHandler.php
@@ -41,6 +41,8 @@
 
 /**
  * This class handles the edit actions in the frontend.
+ *
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class DeleteHandler
 {
@@ -81,7 +83,8 @@ public function handleEvent(ActionEvent $event): void
     {
         if (
             null === ($scopeDeterminator = $this->scopeDeterminator)
-            || !$scopeDeterminator->currentScopeIsFrontend()) {
+            || !$scopeDeterminator->currentScopeIsFrontend()
+        ) {
             return;
         }
 
@@ -113,7 +116,7 @@ public function handleEvent(ActionEvent $event): void
      */
     public function process(EnvironmentInterface $environment): void
     {
-        $definition= $environment->getDataDefinition();
+        $definition = $environment->getDataDefinition();
         assert($definition instanceof ContainerInterface);
 
         $basicDefinition = $definition->getBasicDefinition();
diff --git a/src/View/ActionHandler/EditHandler.php b/src/View/ActionHandler/EditHandler.php
index e6f6142..f3fbd14 100644
--- a/src/View/ActionHandler/EditHandler.php
+++ b/src/View/ActionHandler/EditHandler.php
@@ -39,6 +39,8 @@
 
 /**
  * This class handles the edit actions in the frontend.
+ *
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class EditHandler
 {
diff --git a/src/View/DefaultWidgetBuilder.php b/src/View/DefaultWidgetBuilder.php
index 8b1d6a8..b377a7d 100644
--- a/src/View/DefaultWidgetBuilder.php
+++ b/src/View/DefaultWidgetBuilder.php
@@ -39,6 +39,7 @@
  * Widget Builder to build Contao frontend widgets.
  *
  * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class DefaultWidgetBuilder
 {
diff --git a/src/Widgets/UploadOnSteroids.php b/src/Widgets/UploadOnSteroids.php
index a7cbdab..d3ec9dd 100644
--- a/src/Widgets/UploadOnSteroids.php
+++ b/src/Widgets/UploadOnSteroids.php
@@ -62,6 +62,7 @@
  * @property string  sortBy
  *
  * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class UploadOnSteroids extends FormFileUpload
 {