diff --git a/composer.json b/composer.json
index 42934b7..b260919 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,9 @@
   "require-dev": {
     "phpunit/phpunit": "^4.8|^5.0",
 
-    "goetas-webservices/wsdl2php": "^0.3",
+    "goetas-webservices/wsdl2php": "^0.4",
+    "goetas-webservices/xsd2php": "^0.2.3",
+
     "goetas-webservices/wsdl-reader": "^v0.3.1",
 
     "php-http/guzzle6-adapter": "^1.0",