Sorry for being so vague! What I mean is that Bootcamp drivers for your Windows installation are updated by Apple, and you need to install those updates. You want to keep BOTH your macOS and Bootcamp as up-to-date as possible (including drivers and OS updates for Windows). That's what I"m saying.
Really, what you need to know is that you can upgrade macOS without worrying about Bootcamp (I've done it before), as per your original question.
Hope this clears things up!!