# Flow Mainnet Second Height Coordinated Upgrade on Jan 2nd at 15:00 UTC

**URL:** <https://forum.flow.com/t/flow-mainnet-second-height-coordinated-upgrade-on-jan-2nd-at-15-00-utc/8446>\
**Category:** Node Operations\
**Created:** [January 1, 2026, 11:51pm UTC](https://forum.flow.com/t/flow-mainnet-second-height-coordinated-upgrade-on-jan-2nd-at-15-00-utc/8446 "2026-01-01T23:51:02Z")\
**Posts on this page:** 1\
**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:** [January 1, 2026, 11:51pm UTC](https://forum.flow.com/t/flow-mainnet-second-height-coordinated-upgrade-on-jan-2nd-at-15-00-utc/8446/1 "2026-01-01T23:51:02Z")

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Hello Execution, Verification and Access Node Operators,

There will be a height coordinated upgrade on Flow mainnet today **Jan, 2nd at 15:00 UTC**

Docker tag: Will be shared before the upgrade.

**Actions needed from your side now:**

* * *

1. **Verification** node operators -

Please update your docker to the new tag 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.

Do **not** delete the data folder.

* * *

1. **Execution** node operators -

Please update your docker to the new tag.  
If you do not update now, 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.

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

* * *

**No action needed for Collection and Consensus node type.**

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

Thank you for your cooperation,  
Flow Team.