diff --git a/lib/net/authorize/api/constants/ANetEnvironment.php b/lib/net/authorize/api/constants/ANetEnvironment.php
index f49a7877..bfd6d01f 100644
--- a/lib/net/authorize/api/constants/ANetEnvironment.php
+++ b/lib/net/authorize/api/constants/ANetEnvironment.php
@@ -7,5 +7,5 @@ class ANetEnvironment
     const SANDBOX = "https://apitest.authorize.net";
     const PRODUCTION = "https://api2.authorize.net";
 
-    const VERSION = "1.9.0";
+    const VERSION = "1.9.1";
 }