diff --git a/composer.json b/composer.json
index f2f8b90..c6ea876 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "require": {
         "php": "^7.2",
         "ext-json": "*",
-        "guzzlehttp/guzzle": "^6.3",
+        "guzzlehttp/guzzle": "^6.3 || ^7.0",
         "symfony/polyfill-apcu": "^1.6"
     },
     "require-dev": {