diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23041a04b..22e50b159 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Yii Framework 2 debug extension Change Log
 - Bug #541: Silence fetch errors (Karkbauer)
 - Enh #546: Applying Yii2 coding standards (@s1lver)
 - Enh #546: Raise min version to PHP 7.4 (@s1lver)
+- Bug #548: Fix `Deprecated ArrayObject::__construct()` and Method `ReflectionMethod::setAccessible()` in PHP 8.5 (@terabytesoftw)
 - Bug #549: Enhance documentation and add scripts for `composer.json` (@terabytesoftw)
 
 2.1.27 June 08, 2025
diff --git a/src/FlattenException.php b/src/FlattenException.php
index ef3e48392..398acbe7d 100644
--- a/src/FlattenException.php
+++ b/src/FlattenException.php
@@ -292,8 +292,8 @@ private function flattenArgs($args, $level = 0, &$count = 0)
      */
     private function getClassNameFromIncomplete(\__PHP_Incomplete_Class $value)
     {
-        $array = new \ArrayObject($value);
+        $array = \get_object_vars($value);
 
-        return $array['__PHP_Incomplete_Class_Name'];
+        return (string) ($array['__PHP_Incomplete_Class_Name'] ?? '');
     }
 }
diff --git a/src/models/router/RouterRules.php b/src/models/router/RouterRules.php
index a9ffb242c..e7359709a 100644
--- a/src/models/router/RouterRules.php
+++ b/src/models/router/RouterRules.php
@@ -143,7 +143,11 @@ protected function scanRestRule($restRule)
     {
         $reflectionClass = new \ReflectionClass($restRule);
         $reflectionProperty = $reflectionClass->getProperty('rules');
-        $reflectionProperty->setAccessible(true);
+
+        if (PHP_VERSION_ID < 80100) {
+            $reflectionProperty->setAccessible(true);
+        }
+
         $rulesGroups = $reflectionProperty->getValue($restRule);
 
         foreach ($rulesGroups as $rules) {
diff --git a/tests/TestCase.php b/tests/TestCase.php
index f9ba2e69b..d58d95cfe 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -73,9 +73,17 @@ protected function invoke($object, $method, array $args = [])
     {
         $classReflection = new \ReflectionClass(get_class($object));
         $methodReflection = $classReflection->getMethod($method);
-        $methodReflection->setAccessible(true);
+
+        if (PHP_VERSION_ID < 80100) {
+            $methodReflection->setAccessible(true);
+        }
+
         $result = $methodReflection->invokeArgs($object, $args);
-        $methodReflection->setAccessible(false);
+
+        if (PHP_VERSION_ID < 80100) {
+            $methodReflection->setAccessible(false);
+        }
+
         return $result;
     }
 }