diff --git a/composer.json b/composer.json
index 1ad5953..5c9b2c0 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "guzzlehttp/guzzle": "^6.2"
+        "guzzlehttp/guzzle": "^6.2|^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.2",