diff --git a/composer.json b/composer.json
index e660917..5bb8784 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,8 @@
     "require": {
         "php": ">=5.4.0",
         "illuminate/support": "~5",
-        "omnipay/common": "~3.0"
+        "omnipay/common": "~3.0",
+        "php-http/guzzle6-adapter": "~2.0.0"
     },
     "autoload": {
         "psr-0": {