Aleph does not perform updates and database migrations automatically. (Except for the Kubernetes setup, which does it as a job) Once you have the latest version, you can run the command bellow to upgrade the existing installation (i.e. apply changes to the database model or the search index format). In production mode, you may want to perform a backup before running an upgrade.
host$ docker-compose run --rm shell aleph upgrade
You will have to pull new docker images or check out the latest version using Git in order to fetch the latest product version.