Ardor version 2.2.1 is a stable release and a mandatory upgrade for all nodes.
Get it <here>
This release adds support for the new Max Crowdfund (formerly Dominium) child
chain, token name MPG, to be activated at block 543000 expected to be reached on
January 10, 2019.
At the same block, the new Lightweight Contracts and Asset Properties features
will also become enabled on mainnet.
Read the complete changelog <here>