diff --git a/composer.json b/composer.json
index d7e9999..51c0348 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
 
   "require": {
     "eher/oauth": "^1.0.7 <1.1",
-    "guzzlehttp/guzzle": "^6.5.2"
+    "guzzlehttp/guzzle": "^6.5.2 || ^7.0.1"
   },
 
   "require-dev": {