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 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). If you have questions about an app installation, please contact the app’s support team (you should find the support contact details on each app’s page). Also, if you’ve had the theme code customized to add new features or change the layout, those customizations would need to be redone on the new theme.