diff --git a/framework/core/src/Extend/Compat.php b/framework/core/src/Extend/Compat.php
index 1cfb2146f..e99b483e7 100644
--- a/framework/core/src/Extend/Compat.php
+++ b/framework/core/src/Extend/Compat.php
@@ -23,7 +23,7 @@ use Illuminate\Contracts\Container\Container;
  */
 class Compat implements ExtenderInterface
 {
-    protected $callback;
+    private $callback;
 
     public function __construct($callback)
     {
diff --git a/framework/core/src/Extend/Formatter.php b/framework/core/src/Extend/Formatter.php
index 889772b7e..b185a12cd 100644
--- a/framework/core/src/Extend/Formatter.php
+++ b/framework/core/src/Extend/Formatter.php
@@ -17,7 +17,7 @@ use Illuminate\Events\Dispatcher;
 
 class Formatter implements ExtenderInterface, LifecycleInterface
 {
-    protected $callback;
+    private $callback;
 
     public function configure($callback)
     {
diff --git a/framework/core/src/Extend/Frontend.php b/framework/core/src/Extend/Frontend.php
index 9f7129101..3fd5e8554 100644
--- a/framework/core/src/Extend/Frontend.php
+++ b/framework/core/src/Extend/Frontend.php
@@ -25,12 +25,12 @@ use Illuminate\Contracts\Container\Container;
 
 class Frontend implements ExtenderInterface
 {
-    protected $frontend;
+    private $frontend;
 
-    protected $css = [];
-    protected $js;
-    protected $routes = [];
-    protected $content = [];
+    private $css = [];
+    private $js;
+    private $routes = [];
+    private $content = [];
 
     public function __construct(string $frontend)
     {
diff --git a/framework/core/src/Extend/Locales.php b/framework/core/src/Extend/Locales.php
index 8c6fd5f7f..533416144 100644
--- a/framework/core/src/Extend/Locales.php
+++ b/framework/core/src/Extend/Locales.php
@@ -16,7 +16,7 @@ use Illuminate\Contracts\Container\Container;
 
 class Locales implements ExtenderInterface, LifecycleInterface
 {
-    protected $directory;
+    private $directory;
 
     public function __construct($directory)
     {
diff --git a/framework/core/src/Extend/Middleware.php b/framework/core/src/Extend/Middleware.php
index 73e0d2d5e..fac40bd56 100644
--- a/framework/core/src/Extend/Middleware.php
+++ b/framework/core/src/Extend/Middleware.php
@@ -14,12 +14,12 @@ use Illuminate\Contracts\Container\Container;
 
 class Middleware implements ExtenderInterface
 {
-    protected $addMiddlewares = [];
-    protected $removeMiddlewares = [];
-    protected $replaceMiddlewares = [];
-    protected $insertBeforeMiddlewares = [];
-    protected $insertAfterMiddlewares = [];
-    protected $frontend;
+    private $addMiddlewares = [];
+    private $removeMiddlewares = [];
+    private $replaceMiddlewares = [];
+    private $insertBeforeMiddlewares = [];
+    private $insertAfterMiddlewares = [];
+    private $frontend;
 
     public function __construct(string $frontend)
     {
diff --git a/framework/core/src/Extend/Routes.php b/framework/core/src/Extend/Routes.php
index 3867ca541..33e1e4da3 100644
--- a/framework/core/src/Extend/Routes.php
+++ b/framework/core/src/Extend/Routes.php
@@ -16,9 +16,9 @@ use Illuminate\Contracts\Container\Container;
 
 class Routes implements ExtenderInterface
 {
-    protected $appName;
+    private $appName;
 
-    protected $routes = [];
+    private $routes = [];
 
     public function __construct($appName)
     {