I am implementing the World Map Highchart and I am trying to figure out how to ensure I have the most up to date topology json file.

The one I have found is here: https://code.highcharts.com/mapdata/custom/world.topo.json

But that one only has 213 countries listed. Looking at the files I see that it was generated with data from https://www.naturalearthdata.com/

However, looking at their sites they list that there are 258 countries. So it seems like this topology file is not up to date.

Is there one that is?
How is this json file generated, is it a download from their website or you process it?