Version 4.x of d3.js, which is not backward compatible, came out end of June16.
The bower.json for dc.js includes:
"dependencies": {
  "d3": "3.x",
  "crossfilter2": "~1.3"
}
which explicitly requires v3 (not higher) of d3.js.
Is dc.js currently compatibility with version 4.x of d3.js? If not, is this planned?