According to Foresight News: The Sui mainnet has been upgraded to version V1.7.1, which includes several fixes and optimizations. Among the improvements are an upgrade to protocol version 20, the addition of a Kiosk Extensions API and a new sui::kiosk_extension module in the Sui framework. Developers can use this API to build custom Kiosk applications to extend the basic functionality of Kiosk. The upgrade also enables the narwhal_new_leader_election_schedule flag for the new Narwhal leader scheduling algorithm, which enhances fault tolerance and sets a staking threshold for malicious nodes.