diff --git a/composer.json b/composer.json
index 5176c7b..aedc5d9 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
     "require-dev": {
         "phpunit/phpunit": "^10.5",
         "php-coveralls/php-coveralls": "^2.2",
-        "vimeo/psalm": "5.17.0"
+        "vimeo/psalm": "5.17.0",
+        "guzzlehttp/guzzle": "^7.0"
     },
     "suggest": {
         "ext-timezonedb": "This PECL extension provides up-to-date timezone information"