# Question on Kafka Upgrade bounces

**URL:** <https://forum.confluent.io/t/question-on-kafka-upgrade-bounces/2359>\
**Category:** Ops\
**Created:** [27 July 2021 13:41 UTC](https://forum.confluent.io/t/question-on-kafka-upgrade-bounces/2359 "2021-07-27T13:41:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dana](https://avatars.discourse-cdn.com/v4/letter/d/9de053/32.png) [@dana](https://forum.confluent.io/u/dana)\
**Post date:** [27 July 2021 13:41 UTC](https://forum.confluent.io/t/question-on-kafka-upgrade-bounces/2359/1 "2021-07-27T13:41:21Z")

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Hi,

My name is Dana, from Ethoca Inc. , Canada. I am looking through the kafka upgrade guide linked below, and am a bit confused on the bounces, it says:

> if upgrading from 2.3 or below, you will need to do two rolling bounces, where during the first rolling bounce phase you set the config `upgrade.from="older version"` (possible values are `"0.10.0" - "2.3"` ) and during the second you remove it.

Do we have to keep the applications set to `upgrade.from="2.3"` until all the applications of our kafka cluster are upgraded to 2.4+, or is it in the context of the same application, i.e. the instances of the same application getting to 2.4+ and then good to go with the second bounce? Could you please clarify this part?

Link: [https://kafka.apache.org/28/documentation/streams/upgrade-guide](https://kafka.apache.org/28/documentation/streams/upgrade-guide)

Thank you!

Dana