diff --git a/composer.json b/composer.json
index 16659a5..ad4b316 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
   ],
   "require": {
     "php": ">=5.5",
-    "guzzlehttp/guzzle": "^6.3",
+    "guzzlehttp/guzzle": "^6.3 || ^7.0",
     "psr/log": "^1.1",
     "ext-json": "*",
     "monolog/monolog": "^1.6|^2.0",