Hot on the heels of our major feature release 0.20.2... Version 0.21.0 brings a breaking Tendermint upgrade from 0.22.8 -> 0.23.0. We also noticed an issue with some of our long-running chains whereby our versioned merkle tree (https://github.com/tendermint/iavl - which efficiently stores a complete snapshot of state after each block commit) was failing to load quite lazily enough - and was hitting the database to load each previous version root. We have upgraded to version 0.10.0 of IAVL in which this issue is fixed.