According to Foresight News, the Sui mainnet has been upgraded to version V1.8.1. The upgrade includes the addition of a zkLogin protocol configuration feature flag for testing in the development network and the use of updated proof verification logic for zkLogin signature verification. Additionally, the new version introduces extra linter warnings related to collection comparisons in the Sui framework code (Bag, Table, and TableVec) when building Move code. The update also improves error code designation to support clearer error reporting structures.