Flow Testnet Height Co-ordinated Upgrade

Scheduled Maintenance Report for Flow

Completed

The testnet HCU is now complete.

This upgrade introduced a non-breaking stricter transaction verification change - https://forum.flow.com/t/stricter-transaction-verification-in-the-flow-virtual-machine-fvm-and-access-api/8481

Posted Jan 28, 2026 - 20:16 UTC

Update

Resuming the Height Coordinated Upgrade on Testnet.

Posted Jan 28, 2026 - 19:59 UTC

Update

The HCU is paused until the current issue on testnet has been resolved.

Posted Jan 28, 2026 - 19:41 UTC

In progress

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

Posted Jan 28, 2026 - 19:30 UTC

Update

We will be undergoing scheduled maintenance during this time.

Posted Jan 28, 2026 - 19:10 UTC

Scheduled

Flow Testnet will undergo a height-coordinated upgrade (HCU).

The upgrade will NOT cause any network downtime except for transaction execution being paused for a few minutes while the execution nodes restart.

No impact on mainnet.

Posted Jan 28, 2026 - 19:10 UTC

This scheduled maintenance affected: Flow Testnet.