Both the Exodus and Resurrect themes have been updated with various improvements including considerations for the Customizer in the WordPress 4.3 release. Both of our themes are compatible but to get the most out of WordPress 4.3 and to take advantage of the other improvements to the themes, we recommend updating to the latest version right now.
Please find information about the updates here:
Customers with an active theme license can update with one click. First, make sure your license is active in Appearance > Theme License then go to Dashboard > Updates (or Appearance > Themes) to update your theme with one click.
If you have any questions about these updates, please get in touch.