When a major WP release arises it is crucial not to update WP version unless you are 100% sure that our Theme is compatible at that particular time. Proper order of update is Theme first, WP later.
It is very important to stay always updated in both Theme & related plugins. Proper way of updating Theme & related plugins can be found here: How to update Engic.
You could frequently check the changelog of our Theme in the following link: Engic changelog.
In that way you can always be sure that your site will always work flawlessly.