diff --git a/.travis.yml b/.travis.yml
index b96f1d3..6c0dc15 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,4 +16,5 @@ matrix:
 
 before_script:
   - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "session.serialize_handler = php" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
+  - php -m
   - composer install --dev --prefer-source
diff --git a/composer.json b/composer.json
index 038e290..9529618 100644
--- a/composer.json
+++ b/composer.json
@@ -27,8 +27,8 @@
       , "ratchet/rfc6455": "^0.2"
       , "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5"
       , "guzzlehttp/psr7": "^1.0"
-      , "symfony/http-foundation": "^2.2|^3.0"
-      , "symfony/routing": "^2.2|^3.0"
+      , "symfony/http-foundation": "^2.6|^3.0|^4.0"
+      , "symfony/routing": "^2.6|^3.0|^4.0"
     }
   , "require-dev": {
         "phpunit/phpunit": "~4.8"