diff --git a/src/ActiveRecord.php b/src/ActiveRecord.php
index d29f50e..7b996c0 100644
--- a/src/ActiveRecord.php
+++ b/src/ActiveRecord.php
@@ -11,6 +11,7 @@
 
 namespace hiqdev\hiart;
 
+use Yii;
 use yii\base\InvalidConfigException;
 use yii\base\NotSupportedException;
 use yii\db\ActiveQueryInterface;
@@ -30,7 +31,7 @@ class ActiveRecord extends BaseActiveRecord
      */
     public static function getDb()
     {
-        return \Yii::$app->get('hiart');
+        return Yii::$app->get('hiart');
     }
 
     /**
@@ -41,10 +42,10 @@ public static function getDb()
     public static function find($options = [])
     {
         $config = [
-            'class'   => ActiveQuery::className(),
+            'class'   => ActiveQuery::class,
             'options' => $options,
         ];
-        return \Yii::createObject($config, [get_called_class()]);
+        return Yii::createObject($config, [get_called_class()]);
     }
 
     /**
diff --git a/src/DebugAction.php b/src/DebugAction.php
index 4dcb4fa..1bbac74 100644
--- a/src/DebugAction.php
+++ b/src/DebugAction.php
@@ -59,7 +59,7 @@ public function run($logId, $tag)
         parse_str($body, $options);
 
         /* @var $db Connection */
-        $db   = \Yii::$app->get($this->db);
+        $db   = Yii::$app->get($this->db);
         $time = microtime(true);
         switch ($method) {
             case 'GET':
diff --git a/src/DebugPanel.php b/src/DebugPanel.php
index 747fa24..b1e1a64 100644
--- a/src/DebugPanel.php
+++ b/src/DebugPanel.php
@@ -11,6 +11,7 @@
 
 namespace hiqdev\hiart;
 
+use Yii;
 use yii\debug\Panel;
 use yii\helpers\ArrayHelper;
 use yii\helpers\Html;
@@ -81,7 +82,7 @@ public function getDetail()
         $i = 0;
         // Try to get API URL
         try {
-            $component = \Yii::$app->get('hiart');
+            $component = Yii::$app->get('hiart');
             $apiUrl = (StringHelper::endsWith($component->config['base_uri'],
                 '/')) ? $component->config['base_uri'] : $component->config['base_uri'] . '/';
         } catch (\yii\base\InvalidConfigException $e) {
@@ -135,7 +136,7 @@ public function getDetail()
         }
         $rows = implode("\n", $rows);
 
-        \Yii::$app->view->registerCss(<<<CSS
+        Yii::$app->view->registerCss(<<<CSS
 .string { color: green; }
 .number { color: darkorange; }
 .boolean { color: blue; }
@@ -144,7 +145,7 @@ public function getDetail()
 CSS
         );
 
-        \Yii::$app->view->registerJs(<<<JS
+        Yii::$app->view->registerJs(<<<JS
 function syntaxHighlight(json) {
     json = json.replace(/&/g, '&').replace(/</g, '&lt;').replace(/>/g, '&gt;');
     return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {