diff --git a/composer.json b/composer.json
index f9c6e1c..286a924 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "symfony/http-foundation": "~2.0|~3.0"
+        "symfony/http-foundation": "~2.0|~3.0|~4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0"