Flow Forte Network Upgrade

Scheduled Maintenance Report for Flow

Postmortem

Flow Mainnet Forte Network Upgrade Retrospective

On October 22, 2025, the Flow Mainnet underwent a planned network upgrade. While the upgrade was completed successfully, the process took longer than expected due to several technical issues encountered during execution.

Below is a summary of the main findings and follow-up actions from the retrospective:

Upgrade Timing and Sequencing: Flow Foundation Access nodes were stopped earlier than intended without checking their latest block height, leading to missing blocks that were required for the Flow Foundation’s EVM Gateways to serve historical queries. Future upgrades will follow on-chain height-coordinated shutdown procedure to ensure all nodes capture the complete block range before shutting down.
Flow Foundation Automation Validation: Certain Flow Foundation automation scripts failed to execute as expected due to configuration inconsistencies. New checks will be added to ensure such configuration inconsistencies are easily identified and resolved. This includes checks for duplicate node entries when generating the genesis data - this error was flagged by the automation but it took the team some time to comprehend and resolve. Additionally, Flow engineering team will expand on the dry-run process which is executed during the days leading up to the network upgrade, to be more comprehensive by including all nodes and not just the foundation nodes.
Partner Automation Improvements: Partner node startup issues were traced to missing or incorrect parameters in startup procedures and to incorrect Foundation issued standard operating procedure (SOP). Partner automation and SOP will be reviewed step-by-step and a dry-run will be performed before future network upgrades to ensure that nodes can be started successfully.
Communication and Coordination: Parallel troubleshooting during the upgrade led to gaps in communication between teams. While partners can run separate channels for deep-diving into issues, a point-of-contact/incident commander will provide updates to the main coordination channel to ensure timely visibility into progress and issues.

The Flow network has been operating normally since the upgrade. These improvements will help ensure future network updates are more predictable and resilient.

Posted Oct 30, 2025 - 00:34 UTC

Completed

The Flow mainnet Forte network upgrade is now complete.

Start height is: 130290659

Release notes: https://flow.com/forte/release_notes

Posted Oct 22, 2025 - 20:50 UTC

Update

The Flow network is now up. The public access endpoint is now available.

The Flow EVM Gateway is not yet available and will be online shortly.

Posted Oct 22, 2025 - 19:12 UTC

Verifying

The Flow Network Upgrade is still ongoing, but the upgrade is almost complete.

The team are running a couple of remaining checks, estimated to be completed in the next 30 minutes. Any additional updates will be shared then.

Thank you for your patience

Posted Oct 22, 2025 - 18:38 UTC

Update

The network upgrade is running behind.
Block finalization and sealing has resumed but some of the collector nodes have run into issues affecting collection finalization rate.
Once that issue is resolved, we have a few more checks to perform and then the public access endpoint should be available.
Current ETA: 18:30 UTC

Posted Oct 22, 2025 - 17:38 UTC

Update

The network upgrade is underway.
State extraction is currently in process and should be done in ~1 hour.
After state extraction, the next step is verification of the migrated state that will take ~40 mins.

Posted Oct 22, 2025 - 14:18 UTC

In progress

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

Posted Oct 22, 2025 - 13:00 UTC

Update

Reminder: Flow mainnet network upgrade tomorrow.

Posted Oct 21, 2025 - 22:34 UTC

Update

Forte, the biggest upgrade to Flow since Crescendo (https://flow.com/upgrade/crescendo), is coming to mainnet in 7 days. Forte introduces a new era of onchain automation and composability on Flow, empowering developers and AI agents building on Flow.

Reminder - Flow mainnet will be unavailable during the maintenance window. During the maintenance, any updates will be shared on the Flow Status page.

Learn more about Forte @here ⤵️
Forte: Introducing Actions & Agents - https://www.flow.com/post/forte-introducing-actions-agents-supercharging-composability-and-automation

Start building today with Forte and have a chance to win a share of $250,000 in prizes with Forte Hacks ⤵️
Forte Hacks: Flow Hackathon - https://www.hackquest.io/hackathons/Forte-Hacks
Forte Developer Docs - https://developers.flow.com/blockchain-development-tutorials/forte

Posted Oct 15, 2025 - 21:47 UTC

Update

Reminder - Flow mainnet network upgrade on Wednesday, 22 October 2025.
Please note: the upgrade will start at 1:00 pm UTC on that date.

Posted Sep 23, 2025 - 19:58 UTC

Scheduled

Forte upgrades Flow with the tools and performance to make Flow the best-in-class option for developers looking to build on and with AI. By tapping into the developer friendliness of Cadence, launching new features, creating a library of components for developers to build from, upgrading the protocol and refining Flow tokenomics, Forte makes the dream of building consumer-ready onchain applications with AI a reality.

Flow Mainnet Maintenance
Flow Mainnet will be upgrading on Wednesday, 22 October 2025, 1pm UTC (6am PT).

For more details on the Forte network upgrade you can visit here ⤵️
👉 https://www.flow.com/post/forte-the-next-era-for-flow

Please subscribe to this page for updates.

Thank you,

The Flow Foundation 🌊

Posted Aug 27, 2025 - 22:31 UTC

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