diff --git a/Models/Navigation.php b/Models/Navigation.php
index c8d8e61..29de43c 100644
--- a/Models/Navigation.php
+++ b/Models/Navigation.php
@@ -38,7 +38,7 @@ class Navigation
      * @var array
      * @since 1.0.0
      */
-    private $nav = [];
+    private array $nav = [];
 
     /**
      * Singleton instance.
diff --git a/Views/NavigationView.php b/Views/NavigationView.php
index 10c68d6..4915e54 100644
--- a/Views/NavigationView.php
+++ b/Views/NavigationView.php
@@ -36,7 +36,7 @@ class NavigationView extends View
      * @var int
      * @since 1.0.0
      */
-    protected $navId = 0;
+    protected int $navId = 0;
 
     /**
      * Navigation.
@@ -44,7 +44,7 @@ class NavigationView extends View
      * @var mixed[]
      * @since 1.0.0
      */
-    protected $nav = [];
+    protected array $nav = [];
 
     /**
      * Parent element used for navigation.
@@ -52,7 +52,7 @@ class NavigationView extends View
      * @var int
      * @since 1.0.0
      */
-    protected $parent = 0;
+    protected int $parent = 0;
 
     /**
      * Get navigation Id.