Base Mainnet | Upgrade 15: Isthmus Hard Fork

Scheduled Maintenance Report for Base

Completed

The scheduled maintenance has been completed.

Posted May 09, 2025 - 17:00 UTC

In progress

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

Posted May 09, 2025 - 16:00 UTC

Scheduled

The Isthmus upgrade will occur on Base Mainnet on Friday, May 9th @ 16:00:00 UTC (unix timestamp 1746806401). All Base node operators must update to v0.12.3 before this activation timestamp or they will halt when the network activates Isthmus. If you're not operating a Base node on mainnet, no action is needed. Base will continue to operate as usual without issue during the upgrade.

v0.12.3:
https://github.com/base/node/releases/tag/v0.12.3

For more information about the Isthmus upgrade for the OP stack (including Base) see:
https://docs.optimism.io/notices/upgrade-15
https://specs.optimism.io/protocol/isthmus/overview.html

Posted Apr 28, 2025 - 20:34 UTC

This scheduled maintenance affected: Mainnet (Public RPC API).