diff --git a/composer.json b/composer.json
index a2ded3a..686c444 100644
--- a/composer.json
+++ b/composer.json
@@ -15,9 +15,9 @@
     "require": {
         "bolt/common": "^1.0",
         "php": "^5.5 || ^7.0",
-        "symfony/event-dispatcher": "^2.8 || ^3.0",
-        "symfony/http-foundation": "^2.8 || ^3.0",
-        "symfony/http-kernel": "^2.8 || ^3.0",
+        "symfony/event-dispatcher": "^2.8 || ^3.0 || ^4.0",
+        "symfony/http-foundation": "^2.8 || ^3.0 || ^4.0",
+        "symfony/http-kernel": "^2.8 || ^3.0 || ^4.0",
         "symfony/polyfill-php70": "^1.0"
     },
     "require-dev": {
@@ -29,9 +29,9 @@
         "phpunit/phpunit": "^4.8",
         "predis/predis": "^1.1",
         "silex/silex": "^1.3 || ^2.0",
-        "symfony/cache": "^3.3",
-        "symfony/filesystem": "^2.8 || ^3.0",
-        "symfony/phpunit-bridge": "^3.3"
+        "symfony/cache": "^3.3 || ^4.0",
+        "symfony/filesystem": "^2.8 || ^3.0 || ^4.0",
+        "symfony/phpunit-bridge": "^3.3 || ^4.0"
     },
     "autoload": {
         "psr-4": {