<!-- Thank you for reporting an issue. Please fill in as much of the template below as you're able. C3 version: 0.7.20 D3 version: 5.8.0 Browser: Chrome, Safari OS: MAC If possible, please provide codepen or jsfiddle example that demonstrates the problem, keeping it as simple and free of external dependencies as you are able. --> **Issue:** 1. Upgrading d3-color to 3.1.0 from 1.4.1 with peer dependency of c3. But we are facing the following issue on upgrading - The latest version of c3 is 0.7.20 which will pull version 5.8.0 of d3-library which then will pull the d3-color version 0f 1.4.1 again. - Hence updating the d3-color to 3.1.0 needs the authors of the c3 library to make the c3 library have the latest library of d3.