diff --git a/composer.json b/composer.json
index 0bbeb53..7327cef 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "type": "library",
     "require": {
         "php": ">=7.0",
-        "guzzlehttp/guzzle": "~6.0"
+        "guzzlehttp/guzzle": "~6.0|~7.0"
     },
     "license": "MIT",
     "authors": [