Customizing and handling updates with external design systems

Hello :slight_smile: I’m new to design systems in Figma so I hope I’ll manage to explain my dilemmas.

I wish to use an external design system in my projects (Ant Design Open Source).

Since this is a live design system (it gets regular updates), I’m not sure how to customize it and not lose all the customizations while updating. The updates come from a new project file that I need to publish and swap the old version with the new. When that happens, I lose my customizations (for example - I changed the button color, font, border radius and so on…). Is there a way I can use this kind of design system, tweak it to my needs and still get updates without it overwriting my changes?