diff --git a/composer.json b/composer.json
index dde33e71..30532f2a 100644
--- a/composer.json
+++ b/composer.json
@@ -18,12 +18,12 @@
   "license": "MIT",
   "require": {
     "php": "^5.5|^7.0",
-    "symfony/console": "^2.7|^3.0",
-    "symfony/dependency-injection": "^2.2|^3.0",
+    "symfony/console": "^2.7|^3.0|^4.0",
+    "symfony/dependency-injection": "^2.2|^3.0|^4.0",
     "symfony/config": "^2.2|^3.0",
-    "symfony/yaml": "^2.1|^3.0",
+    "symfony/yaml": "^2.1|^3.0|^4.0",
 
-    "goetas-webservices/xsd-reader": "^0.2",
+    "goetas-webservices/xsd-reader": "^0.2|^0.3@dev",
     "goetas-webservices/soap-reader": "^0.3",
     "doctrine/inflector": "^1.0",
     "zendframework/zend-code": "~2.3",