This is a major release and needs to be done manually (unless you are set up by your host for automatic major WP releases, use a plugin or have changed the wp-config file to do this). I will be updating your website sometime week commencing 6th June. I’ll check everything is ok with your website after the update.
If you have taken over your website entirely then it’s advised to do this soon. In the unlikely event it causes an issue you can request your host roll it back.