diff --git a/src/Config/OpenApi/Security.php b/src/Config/OpenApi/Security.php
index 2de255380..47336672a 100644
--- a/src/Config/OpenApi/Security.php
+++ b/src/Config/OpenApi/Security.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Config/OpenApi/Spec.php b/src/Config/OpenApi/Spec.php
index 8c2b27ca0..516bf015c 100644
--- a/src/Config/OpenApi/Spec.php
+++ b/src/Config/OpenApi/Spec.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Config/OpenApi/Tags.php b/src/Config/OpenApi/Tags.php
index d3bc1e3ba..0282f0687 100644
--- a/src/Config/OpenApi/Tags.php
+++ b/src/Config/OpenApi/Tags.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Controller/Api/OpenApiController.php b/src/Controller/Api/OpenApiController.php
index 4c0582b92..2f7292776 100644
--- a/src/Controller/Api/OpenApiController.php
+++ b/src/Controller/Api/OpenApiController.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Controller/Trait/PaginatedResponseTrait.php b/src/Controller/Trait/PaginatedResponseTrait.php
index a5c4abf4c..31a43c6ac 100644
--- a/src/Controller/Trait/PaginatedResponseTrait.php
+++ b/src/Controller/Trait/PaginatedResponseTrait.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Dto/Unauthorized.php b/src/Dto/Unauthorized.php
index f0b15b28e..6d3655985 100644
--- a/src/Dto/Unauthorized.php
+++ b/src/Dto/Unauthorized.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
@@ -25,6 +26,16 @@
 )]
 final readonly class Unauthorized
 {
-    #[Property(description: 'Message', type: 'string')]
-    public string $message;
+    public function __construct(
+        #[Property(description: 'Message', type: 'string')]
+        private string $message
+    )
+    {
+
+    }
+
+    public function getMessage(): string
+    {
+        return $this->message;
+    }
 }
diff --git a/src/Service/DataObjectSearchService.php b/src/Service/DataObjectSearchService.php
index 8d44e5ff9..aa7ab6625 100644
--- a/src/Service/DataObjectSearchService.php
+++ b/src/Service/DataObjectSearchService.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Service/DataObjectSearchServiceInterface.php b/src/Service/DataObjectSearchServiceInterface.php
index f75885955..018181607 100644
--- a/src/Service/DataObjectSearchServiceInterface.php
+++ b/src/Service/DataObjectSearchServiceInterface.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Service/GenericData/DataObjectSearchAdapterInterface.php b/src/Service/GenericData/DataObjectSearchAdapterInterface.php
index 01cbc7ab7..8b64f8d13 100644
--- a/src/Service/GenericData/DataObjectSearchAdapterInterface.php
+++ b/src/Service/GenericData/DataObjectSearchAdapterInterface.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Service/GenericData/V1/DataObjectQueryProvider.php b/src/Service/GenericData/V1/DataObjectQueryProvider.php
index 9faee41d8..16c5bb611 100644
--- a/src/Service/GenericData/V1/DataObjectQueryProvider.php
+++ b/src/Service/GenericData/V1/DataObjectQueryProvider.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Service/GenericData/V1/DataObjectQueryProviderInterface.php b/src/Service/GenericData/V1/DataObjectQueryProviderInterface.php
index 47873ce01..efc50209c 100644
--- a/src/Service/GenericData/V1/DataObjectQueryProviderInterface.php
+++ b/src/Service/GenericData/V1/DataObjectQueryProviderInterface.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore
diff --git a/src/Service/GenericData/V1/DataObjectSearchAdapter.php b/src/Service/GenericData/V1/DataObjectSearchAdapter.php
index ca2601016..9033f0308 100644
--- a/src/Service/GenericData/V1/DataObjectSearchAdapter.php
+++ b/src/Service/GenericData/V1/DataObjectSearchAdapter.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 /**
  * Pimcore