The most up-to-date version of the Sunrise theme is available in the Theme Store. If you purchased the theme from the Theme Store, then you can add an updated version for free. The most recent version will have support for new Shopify features. You can see a changelog for the theme by clicking here Once Read more
You can always grab the latest theme version as a free upgrade. Once you get the update, you will need to redo your theme settings and may need to reinstall any apps that you’re using (it depends on the individual app).
It’s a good idea to take a theme backup before installing apps or making code changes. That way, you always have a good version to switch back to if something goes wrong. The easiest way to take a theme backup is to duplicate the theme.