diff --git a/composer.json b/composer.json
index 6431520..5d1de69 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     "require": {
         "php": ">=5.5.0",
         "ext-curl": "*",
-        "guzzlehttp/guzzle": "~6.0"
+        "guzzlehttp/guzzle": "~6.0|~7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",