When a new Redis stable release is out, we upgrade our product and QA it. Usually it takes a few weeks to validate the new version. Once the new version is validated we start to upgrade our infrastructure, and maintenance schedule emails are sent to the customers who have a DB on the maintained node.
Once the infrastructure is upgraded, individual customers can be upgraded to that version. We do not initiate the upgrade automatically, it is on-demand only.
Please contact us if you wish to upgrade your Redis.