Flow Mainnet Zero Downtime Height Co-ordinated Upgrade

Scheduled Maintenance Report for Flow

Completed

The scheduled maintenance has been completed.

Posted May 18, 2026 - 16:17 UTC

In progress

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

Posted May 18, 2026 - 15:00 UTC

Scheduled

Flow Mainnet will undergo a scheduled Height-Coordinated Upgrade (HCU).

This upgrade will use the new Zero-Downtime HCU method, which allows the network to be upgraded while transaction execution continues almost uninterrupted. No downtime is expected, though users may notice a brief impact lasting a few seconds during the upgrade window.

We will monitor the network closely throughout the upgrade.

Posted May 12, 2026 - 20:38 UTC

This scheduled maintenance affected: Flow mainnet core components (Transaction Execution, Block Sealing).