diff --git a/src/Mailgun/Constants/Constants.php b/src/Mailgun/Constants/Constants.php
index 28a5ca1..107db16 100644
--- a/src/Mailgun/Constants/Constants.php
+++ b/src/Mailgun/Constants/Constants.php
@@ -1,7 +1,7 @@
 <?PHP
 
 const API_USER = "api";
-const SDK_VERSION = "0.1";
+const SDK_VERSION = "1.11";
 const SDK_USER_AGENT = "mailgun-sdk-php";
 const RECIPIENT_COUNT_LIMIT = 1000;
 const CAMPAIGN_ID_LIMIT = 3;