Matter is the the new standard making your smart home devices talking to each other and some Apple Home hubs can be updated.
There is a nice article from "The Verge" which explains it all.
Using Homebridge(HB) it could be nice to know what happens when you upgrade your HomeKit hub to the new standard so his post will just give some quick tips
Here is a support article from Apple and please note that if you upgrade you will not be able to use an iPad as a Home hub anymore.