Base Mainnet U16A Upgrade

Scheduled Maintenance Report for Base

Completed

The scheduled maintenance has been completed.

Posted Oct 07, 2025 - 19:00 UTC

In progress

Scheduled maintenance is currently in progress. We will provide updates as necessary.

Posted Oct 07, 2025 - 17:00 UTC

Scheduled

Base Mainnet will be undergoing the Optimism Superchain U16A upgrade on October 7, 2025 between 17:00-19:00 UTC.

This upgrade will temporarily invalidate pending withdrawals from Base Mainnet to Ethereum L1. Deposits and onchain activity will continue as normal; this invalidation doesn't place any ETH or ERC-20 tokens at risk.

Please ensure that any pending withdrawals are finalized before October 7, 2025 at 17:00 UTC. Any unfinalized withdrawals will need to be reproven after the upgrade completes.

Posted Sep 29, 2025 - 19:47 UTC

This scheduled maintenance affected: Bridge (Mainnet).