diff --git a/composer.json b/composer.json
index 1736421..d8569e1 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^8.0 || ^9.0",
-    "php-http/guzzle6-adapter": "^1.0",
+    "php-http/guzzle6-adapter": "^2.0.1",
     "mockery/mockery": "^1.3",
     "nyholm/nsa": "^1.0",
     "php-coveralls/php-coveralls": "^2.4",