This release contains the "dragonberry" security release from Cosmos SDK v0.44.5-patch. It should be upgraded IMMEDIATELY by all validator and node operators as a rolling upgrade without organizing a chain halt. Validators can independently upgrade their binaries.
If the chain is experiencing app hash mismatches, core devs will organize a chain halt upgrade to the patched version inside the #validators-verified channel of Discord. If you run a IRISHub validator but are not in the channel please contact a Discord mod. In the case of a chain halt upgrade, validators would downgrade to iris v1.3.0, sync to a designated halt height and then upgrade the network to iris v1.3.1 at that height.