diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index 3c85c01..5ed2de6 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\Marketing\Controller\BackendController;
 use Modules\Marketing\Models\PermissionState;
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index a470e08..d7fb378 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 6d66964..536fa29 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/event-create.tpl.php b/Theme/Backend/event-create.tpl.php
index 4635a57..4e27f3e 100644
--- a/Theme/Backend/event-create.tpl.php
+++ b/Theme/Backend/event-create.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/event-list.tpl.php b/Theme/Backend/event-list.tpl.php
index 9768f2c..11f9697 100644
--- a/Theme/Backend/event-list.tpl.php
+++ b/Theme/Backend/event-list.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/promotion-create.tpl.php b/Theme/Backend/promotion-create.tpl.php
index 5170d0a..f921fd4 100644
--- a/Theme/Backend/promotion-create.tpl.php
+++ b/Theme/Backend/promotion-create.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/promotion-list.tpl.php b/Theme/Backend/promotion-list.tpl.php
index 40a80b9..8aded55 100644
--- a/Theme/Backend/promotion-list.tpl.php
+++ b/Theme/Backend/promotion-list.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/promotion-profile.tpl.php b/Theme/Backend/promotion-profile.tpl.php
index 8a7c61f..f55d75d 100644
--- a/Theme/Backend/promotion-profile.tpl.php
+++ b/Theme/Backend/promotion-profile.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *