diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 2e6dca4..c476164 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -38,7 +38,7 @@ use phpOMS\Message\Http\RequestStatusCode;
  * @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/Calendar.php b/Models/Calendar.php
index e35aea1..cb7840b 100644
--- a/Models/Calendar.php
+++ b/Models/Calendar.php
@@ -24,7 +24,7 @@ use phpOMS\Stdlib\Base\SmartDateTime;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Calendar
+final class Calendar
 {
 
     /**
diff --git a/Models/CalendarMapper.php b/Models/CalendarMapper.php
index 6e26e72..7b7b287 100644
--- a/Models/CalendarMapper.php
+++ b/Models/CalendarMapper.php
@@ -28,7 +28,7 @@ use phpOMS\DataStorage\Database\RelationType;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class CalendarMapper extends DataMapperAbstract
+final class CalendarMapper extends DataMapperAbstract
 {
     /**
      * Class name.
diff --git a/Models/Event.php b/Models/Event.php
index 53fe0e9..8527195 100644
--- a/Models/Event.php
+++ b/Models/Event.php
@@ -26,7 +26,7 @@ use phpOMS\Stdlib\Base\Location;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Event
+final class Event
 {
 
     /**
diff --git a/Models/EventMapper.php b/Models/EventMapper.php
index 12221e6..0e76d4e 100644
--- a/Models/EventMapper.php
+++ b/Models/EventMapper.php
@@ -27,7 +27,7 @@ use phpOMS\DataStorage\Database\RelationType;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class EventMapper extends DataMapperAbstract
+final class EventMapper extends DataMapperAbstract
 {
 
     /**
diff --git a/Models/EventTemplate.php b/Models/EventTemplate.php
index bbf9fb9..f66e0ac 100644
--- a/Models/EventTemplate.php
+++ b/Models/EventTemplate.php
@@ -22,7 +22,7 @@ namespace Modules\Calendar\Models;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class EventTemplate extends Event
+final class EventTemplate extends Event
 {
     /**
      * Type.
diff --git a/Models/Schedule.php b/Models/Schedule.php
index f1363ab..843c8ec 100644
--- a/Models/Schedule.php
+++ b/Models/Schedule.php
@@ -24,7 +24,7 @@ use phpOMS\Stdlib\Base\Exception\InvalidEnumValue;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class Schedule
+final class Schedule
 {
     /**
      * Schedule ID.
diff --git a/Models/ScheduleMapper.php b/Models/ScheduleMapper.php
index 3fa7105..4258c16 100644
--- a/Models/ScheduleMapper.php
+++ b/Models/ScheduleMapper.php
@@ -27,7 +27,7 @@ use phpOMS\DataStorage\Database\RelationType;
  * @link       http://website.orange-management.de
  * @since      1.0.0
  */
-class ScheduleMapper extends DataMapperAbstract
+final class ScheduleMapper extends DataMapperAbstract
 {
 
     /**