Mainnet: Base Denim Upgrade - November 5th

Scheduled for Nov 5, 18:00 - 20:00 UTC

Scheduled

On Thursday, November 5th at 18:00 UTC (Unix timestamp 1793901600), Base Mainnet will undergo the Denim upgrade.

Base Mainnet is expected to remain operational during the upgrade window.

Operators of Base Mainnet nodes must upgrade to base/base v1.5.1 before activation:
https://github.com/base/base/releases/tag/v1.5.1

Operators upgrading from an older release must remove --enable-experimental-validity-transactions from their base-reth-node command if present, or the node will fail to start. Please review the release notes for additional configuration changes.

For more information on the Denim upgrade:
https://docs.base.org/upgrades/denim/overview

Posted Oct 30, 2026 - 22:16 UTC

This scheduled maintenance affects: Mainnet (Client Software).