diff --git a/composer.json b/composer.json
index 1cd6a71..d222a0b 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "symfony/symfony": "~3.0"
+        "symfony/symfony": "~3.0|~4.0"
     },
     "require-dev": {
         "eo/symfony-test-edition": "~3.0"