diff --git a/composer.json b/composer.json
index 0a340e3b..2c54c16d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
         "nesbot/carbon": "~1.2|^2"
     },
     "require-dev": {
+        "cebe/php-openapi": "^1.5",
         "mockery/mockery": "^1.3.1",
         "phpunit/phpunit": "^8.4|^9.0",
         "psy/psysh": "^0.10",