diff --git a/composer.json b/composer.json
index 88e2821..6a2948a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,11 +17,11 @@
     },
     "require": {
         "php": ">=7.0.0",
-        "symfony/framework-bundle": "~2.8|~3.0",
+        "symfony/framework-bundle": "~2.8|~3.0|~4.0",
         "symfony/config": "2.8.*",
         "symfony/dependency-injection": "2.8.*",
         "symfony/http-kernel": "2.8.*",
-        "twig/twig": "1.25.*"
+        "twig/twig": "1.25.*|2.*"
     },
     "require-dev": {
         "phpunit/phpunit": "~5.6"