diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index 1965274..4dd0128 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\QA\Controller\BackendController;
 use Modules\QA\Models\PermissionState;
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index 49cdaf7..69152aa 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/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 7bbdbe7..607d253 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/qa-dashboard.tpl.php b/Theme/Backend/qa-dashboard.tpl.php
index c1bd85c..d782fff 100644
--- a/Theme/Backend/qa-dashboard.tpl.php
+++ b/Theme/Backend/qa-dashboard.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 $questions = $this->getData('questions');
 echo $this->getData('nav')->render(); ?>
 
diff --git a/Theme/Backend/qa-question.tpl.php b/Theme/Backend/qa-question.tpl.php
index 50fd6a7..78665b7 100644
--- a/Theme/Backend/qa-question.tpl.php
+++ b/Theme/Backend/qa-question.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 $question = $this->getData('question');
 $answers = $question->getAnswers();
 
diff --git a/Theme/Backend/qa-tag-edit.tpl.php b/Theme/Backend/qa-tag-edit.tpl.php
index 1d5b96b..65d775a 100644
--- a/Theme/Backend/qa-tag-edit.tpl.php
+++ b/Theme/Backend/qa-tag-edit.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/qa-tag-list.tpl.php b/Theme/Backend/qa-tag-list.tpl.php
index 89b9d46..d8b592c 100644
--- a/Theme/Backend/qa-tag-list.tpl.php
+++ b/Theme/Backend/qa-tag-list.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *