diff --git a/composer.json b/composer.json
index acb0efd..4a5ccad 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     },
     "require": {
         "php": ">=5.6",
-        "guzzlehttp/guzzle": "^6.3.0"
+        "guzzlehttp/guzzle": "^6.3.0|^7.0"
     },
     "license": "MIT"
 }