Sepolia Testnet: Base Denim Upgrade - October 21st

Scheduled for Oct 21, 18:00 - 20:00 UTC

Scheduled

On Wednesday, October 21st at 18:00 UTC (Unix timestamp 1792605600), the Base Sepolia Testnet will undergo the Denim upgrade. Base Sepolia is expected to remain operational during the upgrade window.

Operators of Base Sepolia Testnet nodes must upgrade to the 1.5.0, or greater, release of the https://github.com/base/base software (https://github.com/base/base/releases/tag/v1.5.0).

Please note: operators must remove --enable-experimental-validity-transactions from their base-reth-node command before upgrading, or the node will fail to start.

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

Posted Oct 19, 2026 - 13:52 UTC

This scheduled maintenance affects: Testnet (Client Software).