diff --git a/core/composer.json b/core/composer.json
index fd0e942..1fc8db9 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -3,15 +3,15 @@
   "description": "Drupal is an open source content management platform powering millions of websites and applications.",
   "license": "GPL-2.0+",
   "require": {
-    "symfony/class-loader": "2.1.*",
-    "symfony/dependency-injection": "2.1.*",
-    "symfony/event-dispatcher": "2.1.*",
-    "symfony/http-foundation": "2.1.*",
-    "symfony/http-kernel": "2.1.*",
-    "symfony/routing": "2.1.*",
-    "symfony/serializer": "2.1.*",
-    "symfony/yaml": "2.1.*",
-    "twig/twig": "1.8.*",
+    "symfony/class-loader": "<2.4@dev",
+    "symfony/dependency-injection": "<2.4@dev",
+    "symfony/event-dispatcher": "<2.4@dev",
+    "symfony/http-foundation": "<2.4@dev",
+    "symfony/http-kernel": "<2.4@dev",
+    "symfony/routing": "<2.4@dev",
+    "symfony/serializer": "<2.4@dev",
+    "symfony/yaml": "<2.4@dev",
+    "twig/twig": "1.*",
     "doctrine/common": "2.3.*",
     "guzzle/http": "3.*",
     "kriswallsmith/assetic": "1.1.*"