I will be starting the migration to v2.1.0 for all instances hosted in Masto.host now.
You should expect a couple of minutes of downtime at any time during the next hours.
v2.1.0 brings many improvements and features. I particularly like that now we have an invite system for instances that have closed registration. You can check all release notes, here: https://github.com/tootsuite/mastodon/releases/tag/v2.1.0