diff --git a/Message.php b/Message.php
index 27d1782..10b7496 100644
--- a/Message.php
+++ b/Message.php
@@ -356,7 +356,7 @@ public function getTestMode()
     }
 
     /**
-     * @return Array message object
+     * @return array message object
      */
     public function getMessage()
     {
@@ -364,7 +364,7 @@ public function getMessage()
     }
 
     /**
-     * @return Array files list
+     * @return array files list
      */
     public function getFiles()
     {
diff --git a/composer.json b/composer.json
index 8ce32c4..d621b5f 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     ],
     "require": {
         "yiisoft/yii2": "*",
-        "mailgun/mailgun-php": "1.8"
+        "mailgun/mailgun-php": "~2.1"
     },
     "autoload": {
         "psr-4": {