diff --git a/Admin/Install/Navigation.php b/Admin/Install/Navigation.php
index b320204..747d4c7 100755
--- a/Admin/Install/Navigation.php
+++ b/Admin/Install/Navigation.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Admin\Install
  * @copyright Dennis Eichhorn
diff --git a/Admin/Installer.php b/Admin/Installer.php
index aa7545e..847f82e 100755
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Admin
  * @copyright Dennis Eichhorn
diff --git a/Admin/Status.php b/Admin/Status.php
index 7719bce..4299850 100755
--- a/Admin/Status.php
+++ b/Admin/Status.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Admin
  * @copyright Dennis Eichhorn
diff --git a/Admin/Uninstaller.php b/Admin/Uninstaller.php
index 1412d23..157eb0e 100755
--- a/Admin/Uninstaller.php
+++ b/Admin/Uninstaller.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Admin
  * @copyright Dennis Eichhorn
diff --git a/Admin/Updater.php b/Admin/Updater.php
index 6579ed1..4f3ab37 100755
--- a/Admin/Updater.php
+++ b/Admin/Updater.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Admin
  * @copyright Dennis Eichhorn
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 4b3a2a5..43e1ebd 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Controller/Controller.php b/Controller/Controller.php
index 83f5efa..b00f441 100755
--- a/Controller/Controller.php
+++ b/Controller/Controller.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Models/AcceptStatus.php b/Models/AcceptStatus.php
index 55a4939..95d2586 100755
--- a/Models/AcceptStatus.php
+++ b/Models/AcceptStatus.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/AvailableStatus.php b/Models/AvailableStatus.php
index 4765289..4a435e5 100755
--- a/Models/AvailableStatus.php
+++ b/Models/AvailableStatus.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/Calendar.php b/Models/Calendar.php
index 4f849cd..02cc0cf 100755
--- a/Models/Calendar.php
+++ b/Models/Calendar.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/CalendarMapper.php b/Models/CalendarMapper.php
index 756daac..8ef3147 100755
--- a/Models/CalendarMapper.php
+++ b/Models/CalendarMapper.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/Event.php b/Models/Event.php
index dae24bc..cd4b76d 100755
--- a/Models/Event.php
+++ b/Models/Event.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/EventMapper.php b/Models/EventMapper.php
index 195ddb7..b6edd13 100755
--- a/Models/EventMapper.php
+++ b/Models/EventMapper.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/EventStatus.php b/Models/EventStatus.php
index 68f6af9..54b43d2 100755
--- a/Models/EventStatus.php
+++ b/Models/EventStatus.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/EventTemplate.php b/Models/EventTemplate.php
index 6cd24db..e2cdd4f 100755
--- a/Models/EventTemplate.php
+++ b/Models/EventTemplate.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/EventType.php b/Models/EventType.php
index 6bbf542..6ce88a0 100755
--- a/Models/EventType.php
+++ b/Models/EventType.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/FrequencyInterval.php b/Models/FrequencyInterval.php
index b17c15c..433a527 100755
--- a/Models/FrequencyInterval.php
+++ b/Models/FrequencyInterval.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/FrequencyRelative.php b/Models/FrequencyRelative.php
index 160238c..234ca11 100755
--- a/Models/FrequencyRelative.php
+++ b/Models/FrequencyRelative.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/FrequencyType.php b/Models/FrequencyType.php
index 823f1e0..3350a67 100755
--- a/Models/FrequencyType.php
+++ b/Models/FrequencyType.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/IntervalType.php b/Models/IntervalType.php
index da6bf34..f3bff14 100755
--- a/Models/IntervalType.php
+++ b/Models/IntervalType.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/NullCalendar.php b/Models/NullCalendar.php
index a8c102a..82f1053 100755
--- a/Models/NullCalendar.php
+++ b/Models/NullCalendar.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/NullEvent.php b/Models/NullEvent.php
index a622a6a..ecec4bf 100755
--- a/Models/NullEvent.php
+++ b/Models/NullEvent.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/NullSchedule.php b/Models/NullSchedule.php
index d8542f4..0b9e600 100755
--- a/Models/NullSchedule.php
+++ b/Models/NullSchedule.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/PermissionState.php b/Models/PermissionState.php
index 79693e8..f34f693 100755
--- a/Models/PermissionState.php
+++ b/Models/PermissionState.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/Schedule.php b/Models/Schedule.php
index c46bfc7..71a44d9 100755
--- a/Models/Schedule.php
+++ b/Models/Schedule.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/ScheduleMapper.php b/Models/ScheduleMapper.php
index 98e642e..3811b53 100755
--- a/Models/ScheduleMapper.php
+++ b/Models/ScheduleMapper.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Models/ScheduleStatus.php b/Models/ScheduleStatus.php
index 9be320c..a465514 100755
--- a/Models/ScheduleStatus.php
+++ b/Models/ScheduleStatus.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar\Models
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Components/Calendar/BaseView.php b/Theme/Backend/Components/Calendar/BaseView.php
index b00cf91..b6efb52 100755
--- a/Theme/Backend/Components/Calendar/BaseView.php
+++ b/Theme/Backend/Components/Calendar/BaseView.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Components/Event/BaseView.php b/Theme/Backend/Components/Event/BaseView.php
index de8b34b..cacafed 100755
--- a/Theme/Backend/Components/Event/BaseView.php
+++ b/Theme/Backend/Components/Event/BaseView.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Lang/Navigation.de.lang.php b/Theme/Backend/Lang/Navigation.de.lang.php
index 2cd84ea..727d3c5 100755
--- a/Theme/Backend/Lang/Navigation.de.lang.php
+++ b/Theme/Backend/Lang/Navigation.de.lang.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index d7d23ae..e8af920 100755
--- a/Theme/Backend/Lang/Navigation.en.lang.php
+++ b/Theme/Backend/Lang/Navigation.en.lang.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Lang/api.en.lang.php b/Theme/Backend/Lang/api.en.lang.php
index e0cc3b3..c0ede25 100755
--- a/Theme/Backend/Lang/api.en.lang.php
+++ b/Theme/Backend/Lang/api.en.lang.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Lang/de.lang.php b/Theme/Backend/Lang/de.lang.php
index 0bff2ef..94e8af3 100755
--- a/Theme/Backend/Lang/de.lang.php
+++ b/Theme/Backend/Lang/de.lang.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 5cc7a35..0ea021c 100755
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/Theme/Backend/dashboard-calendar.tpl.php b/Theme/Backend/dashboard-calendar.tpl.php
index f5b973d..2cd70b2 100755
--- a/Theme/Backend/dashboard-calendar.tpl.php
+++ b/Theme/Backend/dashboard-calendar.tpl.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Calendar
  * @copyright Dennis Eichhorn
diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
index 311379b..b72fc95 100755
--- a/tests/Admin/AdminTest.php
+++ b/tests/Admin/AdminTest.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   tests
  * @copyright Dennis Eichhorn
diff --git a/tests/Models/CalendarMapperTest.php b/tests/Models/CalendarMapperTest.php
index 34e81de..0c511fb 100755
--- a/tests/Models/CalendarMapperTest.php
+++ b/tests/Models/CalendarMapperTest.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   tests
  * @copyright Dennis Eichhorn
diff --git a/tests/Models/CalendarTest.php b/tests/Models/CalendarTest.php
index 0fc2ff4..87cf152 100755
--- a/tests/Models/CalendarTest.php
+++ b/tests/Models/CalendarTest.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   tests
  * @copyright Dennis Eichhorn
diff --git a/tests/Models/EventMapperTest.php b/tests/Models/EventMapperTest.php
index 3642563..43172e5 100755
--- a/tests/Models/EventMapperTest.php
+++ b/tests/Models/EventMapperTest.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   tests
  * @copyright Dennis Eichhorn
diff --git a/tests/Models/EventTest.php b/tests/Models/EventTest.php
index 1316491..53b48c3 100755
--- a/tests/Models/EventTest.php
+++ b/tests/Models/EventTest.php
@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   tests
  * @copyright Dennis Eichhorn