diff --git a/composer.json b/composer.json
index 8736d9c..f554556 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "guzzlehttp/guzzle": "~6.3"
+        "guzzlehttp/guzzle": "~6.3|^7.0"
     },
     "autoload": {
         "psr-4": {