diff --git a/composer.json b/composer.json
index 230fdbc..23becb0 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
   "license": "MIT",
   "require": {
     "php": "^7.3|^7.4|^8.0",
-    "laravel/framework": "^5.8|^6.20.26|^7.0|^8.40",
+    "laravel/framework": "^5.8|^6.20.26|^7.0|^8.40|^9.0",
     "doctrine/dbal": "^2.9|^3.0",
     "umbrellio/laravel-pg-extensions": "^5.0",
     "umbrellio/laravel-common-objects": "^2.1"
diff --git a/src/Traits/HasTreeRelationships.php b/src/Traits/HasTreeRelationships.php
index 6674cd9..b3a2a4f 100644
--- a/src/Traits/HasTreeRelationships.php
+++ b/src/Traits/HasTreeRelationships.php
@@ -19,9 +19,6 @@
  */
 trait HasTreeRelationships
 {
-    /**
-     * @throws InvalidTraitInjectionClass
-     */
     final protected function belongsToAncestorsTree(
         string $related,
         string $throwRelation,
@@ -31,9 +28,7 @@ final protected function belongsToAncestorsTree(
         return $this->belongsToTree(BelongsToAncestorsTree::class, $related, $throwRelation, $foreignKey, $ownerKey);
     }
 
-    /**
-     * @throws InvalidTraitInjectionClass
-     */
+
     final protected function belongsToDescendantsTree(
         string $related,
         string $throwRelation,
@@ -49,7 +44,7 @@ final protected function belongsToDescendantsTree(
         );
     }
 
-    final private function belongsToTree(
+    final protected function belongsToTree(
         string $relationClass,
         string $related,
         string $throwRelation,