# Flow mainnet Zero Downtime Height Coordinated Upgrade on Monday, May 18th at 15:00 UTC

**URL:** <https://forum.flow.com/t/flow-mainnet-zero-downtime-height-coordinated-upgrade-on-monday-may-18th-at-15-00-utc/8597>\
**Category:** Node Operations\
**Created:** [May 12, 2026, 5:34pm UTC](https://forum.flow.com/t/flow-mainnet-zero-downtime-height-coordinated-upgrade-on-monday-may-18th-at-15-00-utc/8597 "2026-05-12T17:34:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vishal](https://avatars.discourse-cdn.com/v4/letter/v/49beb7/32.png) [@vishal](https://forum.flow.com/u/vishal)\
**Post date:** [May 12, 2026, 5:34pm UTC](https://forum.flow.com/t/flow-mainnet-zero-downtime-height-coordinated-upgrade-on-monday-may-18th-at-15-00-utc/8597/1 "2026-05-12T17:34:38Z")

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Hello Flow **Access** , **Verification** and **Execution** Node Operators,

There will be a height coordinated upgrade on Flow mainnet tomorrow **May 18th** at **15:00 UTC**.

Please be prepared to update your Flow nodes on Monday.

**Actions needed from your side at that time:**

* * *

1. **Verification** node operators -

Please update your docker to the new tag that will be provided that day as part of an announcement and restart the node.

Do **not** delete the data folder.

_Please complete this action within 24 hour of the announcement_

_If you are running multiple nodes, please restart the nodes one after the other (instead of all at once)._

* * *

1. **Access** node operators -

Please update your docker to the new tag that will be provided that day as part of an announcement and restart the node.

Do **not** delete the data folder.

* * *

1. **Execution** node operators -

Execution nodes will stop executing blocks at a particular height and must be restarted with a new docker tag.  
You can monitor the block height by querying the metric execution\_runtime\_last\_executed\_block\_height.  
e.g. `curl -s http://127.0.0.1:8080/metrics | grep -E '^(execution_runtime_last_executed_block_height)'`

Once the execution node has stopped executing blocks, the height reported by the metric will no longer advance.  
One that happens, do the following:

1. Stop the node
2. Update the docker tag to the one provided that day.
3. Start the node.

Do **not** delete the data folder.  
_Please complete this action immediately for the execution node_

* * *

Updated on 5/18: ALL node types including Collection and Consensus have to be updated.  
~~No action needed for Collection, Consensus and EVM Gateway nodes.~~

This is **NOT** a spork, and the network will keep running during the upgrade.

Thank you for your cooperation,  
Flow Team.

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**Author:** ![APIBuilder7264](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@APIBuilder7264](https://forum.flow.com/u/APIBuilder7264)\
**Post date:** [May 15, 2026, 10:07pm UTC](https://forum.flow.com/t/flow-mainnet-zero-downtime-height-coordinated-upgrade-on-monday-may-18th-at-15-00-utc/8597/2 "2026-05-15T22:07:05Z")

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Interoperability between chains will define the next cycle. Users should not need to care about which chain their assets are on. Seamless cross-chain experiences are the goal.