more agressive node version?

package.json

@@ -2,7 +2,10 @@
     "name": "bootstrap-server"
   , "description": "a build tool for bootstrap"
   , "version": "1.0.0"
-  , "engines": { "node": "0.6.20" }
+  , "engines": {
+      "node": "0.10.x",
+      "npm": "1.3.x"
+    }
   , "main": "web.js"
   , "dependencies": {
       "express": "2.5.5"