diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index f50d19a..d625d23 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -33,7 +33,7 @@ use phpOMS\Views\View;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class BackendController extends Controller
+final class BackendController extends Controller
 {
     /**
      * @param RequestAbstract  $request  Request
diff --git a/Models/Item.php b/Models/Item.php
index 39aeda1..ca4b017 100644
--- a/Models/Item.php
+++ b/Models/Item.php
@@ -24,7 +24,7 @@ use Modules\Media\Models\Media;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Item
+final class Item
 {
     private $id = 0;
 
diff --git a/Models/ItemMapper.php b/Models/ItemMapper.php
index 64f4d6f..1277862 100644
--- a/Models/ItemMapper.php
+++ b/Models/ItemMapper.php
@@ -23,7 +23,7 @@ use phpOMS\DataStorage\Database\Query\Builder;
 use phpOMS\DataStorage\Database\Query\Column;
 use phpOMS\DataStorage\Database\RelationType;
 
-class ItemMapper extends DataMapperAbstract
+final class ItemMapper extends DataMapperAbstract
 {
     /**
      * Columns.