Upgrade Docker Nodes' Engine (Moby)

Starting a new thread as my question in the older thread didn’t get a response.

I used the CloudFormation template to deploy an AWS Docker EE Swarm. What is the process for updating the cluster nodes’ Docker Engine? Doesn’t look like apk is used to deploy/manage Docker Engine. I also registered this Swarm as a “bring your own swarm” in Docker Cloud and don’t see anything there for lifecycle management of the cluster.

This is missing from the Docker EE upgrade document: