diff --git a/composer.json b/composer.json
index 618cbd6..590bbb5 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "license": "MIT",
     "minimum-stability": "stable",
     "require": {
-        "guzzlehttp/guzzle": "^6.3",
+        "guzzlehttp/guzzle": "^6.3 || ^7",
         "php": ">=7.0.1",
         "lib-curl": "*"
     },