The Base mainnet will undergo the Optimism Superchain U16A upgrade on October 8, with a temporary invalidation of pending withdrawals to Ethereum L1 during the upgrade window.
Base Build has announced that the Base mainnet will undergo the Optimism Superchain U16A upgrade on October 8 between 1:00 and 3:00 Beijing time. During this window, pending withdrawals to Ethereum L1 will be invalidated, while deposits and other on-chain activities will continue as usual. Users are advised to complete pending withdrawals before the upgrade begins.