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# Upgrading ESM

If ESM is deployed, you should perform the following:

For cloud deployments, the OMT upgrade causes the FQDN (fully qualified domain name) of the Kafka nodes to change. This invalidates the ESM event ingestion configuration from Transformation Hub.

Therefore, after the ESM upgrade, the configuration of both ESM and Transformation Hub must be rectified by running the ESM `managersetup` utility and updating the Kafka nodes in the Transformation Hub connection settings.

- Change your ESM enrichment configuration and Transformation Hub topic routing, as described under Local and Global ESM Event Enrichment.

- Upgrade ESM: be aware that for platform 23.1 and later versions, ESM requires an upgrade to version 7.6.4 to guarantee ECC compatibility. See the Upgrade Guide for ESM.