diff --git a/composer.json b/composer.json
index ae59c84..7da2d91 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "php": ">=7.2",
         "ext-json": "*",
         "myclabs/php-enum": "1.*",
-        "guzzlehttp/guzzle": "7.*",
+        "guzzlehttp/guzzle": "^6.0.0",
         "justinrainbow/json-schema": "^5.2.10"
     },
     "require-dev": {