Any reason d3 is not upgraded to 5.x?

Hi - any reason why plotly is still on d3 3.x when it is up to 5.7 now?

This seems like a d3 issue that I’m getting in an angular app on ng build (but not when I run via ng serve, strangely):

d3.js:8 Uncaught TypeError: Cannot read property 'document' of undefined
    at d3.js:8
    at Object.../node_modules/d3/d3.js (d3.js:9554)
    at __webpack_require__ (bootstrap:78)
    at Object.../node_modules/plotly.js/src/lib/index.js (index.js:12)
    at __webpack_require__ (bootstrap:78)
    at Object.../node_modules/plotly.js/build/plotcss.js (plotcss.js:3)
    at __webpack_require__ (bootstrap:78)
    at Object.../node_modules/plotly.js/src/core.js (core.js:18)
    at __webpack_require__ (bootstrap:78)
    at Object.../node_modules/plotly.js/lib/core.js (core.js:11)
(anonymous) @ d3.js:8
../node_modules/d3/d3.js @ d3.js:9554
__webpack_require__ @ bootstrap:78
../node_modules/plotly.js/src/lib/index.js @ index.js:12
__webpack_require__ @ bootstrap:78
../node_modules/plotly.js/build/plotcss.js @ plotcss.js:3
__webpack_require__ @ bootstrap:78
../node_modules/plotly.js/src/core.js @ core.js:18
__webpack_require__ @ bootstrap:78
../node_modules/plotly.js/lib/core.js @ core.js:11
__webpack_require__ @ bootstrap:78
../node_modules/plotly.js/lib/index.js @ index.js:11
__webpack_require__ @ bootstrap:78
./app/app.module.ts @ app.component.ts:8
__webpack_require__ @ bootstrap:78
./main.ts @ main.ts:9
__webpack_require__ @ bootstrap:78
0 @ main.ts:17
__webpack_require__ @ bootstrap:78
checkDeferredModules @ bootstrap:45
webpackJsonpCallback @ bootstrap:32
(anonymous) @ main-es2015.js:1

Seems like this is in motion, is anyone aware of a roadmap/release date for 2.0.0?