diff --git a/composer.json b/composer.json
index 1736421..638e001 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,8 @@
     "php-http/httplug": "^1.0 || ^2.0",
     "php-http/message": "^1.0",
     "php-http/client-implementation": "^1.0",
-    "php-http/discovery": "^1.0"
+    "php-http/discovery": "^1.0",
+    "php-http/message-factory": "^1.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^8.0 || ^9.0",