diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index 3acda8f..d5714be 100644
--- a/Admin/Routes/Web/Backend.php
+++ b/Admin/Routes/Web/Backend.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 use Modules\EventManagement\Controller\BackendController;
 use Modules\EventManagement\Models\PermissionState;
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index bdd8e71..2e67517 100644
--- a/Theme/Backend/Lang/Navigation.en.lang.php
+++ b/Theme/Backend/Lang/Navigation.en.lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/Lang/api.en.lang.php b/Theme/Backend/Lang/api.en.lang.php
index 959dc12..763b2bb 100644
--- a/Theme/Backend/Lang/api.en.lang.php
+++ b/Theme/Backend/Lang/api.en.lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 7e8642e..723decf 100644
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/eventmanagement-create.tpl.php b/Theme/Backend/eventmanagement-create.tpl.php
index f5b2f64..72415bf 100644
--- a/Theme/Backend/eventmanagement-create.tpl.php
+++ b/Theme/Backend/eventmanagement-create.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/eventmanagement-list.tpl.php b/Theme/Backend/eventmanagement-list.tpl.php
index ecc0643..b9cfe20 100644
--- a/Theme/Backend/eventmanagement-list.tpl.php
+++ b/Theme/Backend/eventmanagement-list.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/eventmanagement-profile.tpl.php b/Theme/Backend/eventmanagement-profile.tpl.php
index b5d6319..db14922 100644
--- a/Theme/Backend/eventmanagement-profile.tpl.php
+++ b/Theme/Backend/eventmanagement-profile.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *