Hello Everyone!
The main build of the game, Default Build, or "None" as Steam sets the name to, will be updated to v1.23 on December 15th. This update will require you to start a new save game.
You may continue to play your older save games by switching the version of the game you are subscribed to. On December 12th we will update Stable build to v1.22, and legacy build to v1.21. On that date, or after, you would simply switch to Stable build to continue your v1.22 save games.