This is a runtime upgrade for Karura that upgrades Substrate/Cumulus/Polkadot to v0.9.40. This also includes Eth Call V2 format and various improvements to Acala EVM+.
Release Note: https://github.com/AcalaNetwork/Acala/releases/tag/2.18.0
https://karura.subscan.io/referenda/88
https://karura.subsquare.io/democracy/referendum/88