diff --git a/composer.json b/composer.json
index ef147c40..862bfc0f 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     "require": {
         "php": ">=7.2",
         "ext-json": "*",
-        "guzzlehttp/guzzle": "~7.0"
+        "guzzlehttp/guzzle": "~6.0 | ^7.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.13",