To upgrade you need to (1) Sync repository, (2) Re-build the container image, and (3) Update Chevereto instances.
Sync this repository to get the latest changes.
make sync
Note: If there's a new branch (for example 4.2) switch to that branch running the following command:
git switch 4.2
Build a new container image to reflect the newest release.
make image
This will down and re-up the containers and carry the required database update.
make update