# Is there any risk to upgrade server (regarding client - server synchronization)

**URL:** <https://hub.mender.io/t/is-there-any-risk-to-upgrade-server-regarding-client-server-synchronization/2845>\
**Category:** General Discussions\
**Created:** [November 17, 2020, 5:17pm UTC](https://hub.mender.io/t/is-there-any-risk-to-upgrade-server-regarding-client-server-synchronization/2845 "2020-11-17T17:17:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jerry](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/jerry/32/931_2.png) [@Jerry](https://hub.mender.io/u/Jerry)\
**Post date:** [November 17, 2020, 5:17pm UTC](https://hub.mender.io/t/is-there-any-risk-to-upgrade-server-regarding-client-server-synchronization/2845/1 "2020-11-17T17:17:28Z")

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We are currently using mender 2.2. and i saw that there is a big change in image/artifact creation between 2.2 et 2.3 (and newer).

I was wondering if there was any relation between client and server version number.  
ie : can we upgrade the server with “old” clients remaining or de we have to force upgrade of clients as we upgrade server.

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**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\
**Post date:** [November 17, 2020, 5:43pm UTC](https://hub.mender.io/t/is-there-any-risk-to-upgrade-server-regarding-client-server-synchronization/2845/2 "2020-11-17T17:43:53Z")

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No, the older clients can still connect. We use [semantic versioning](https://semver.org/) so between 2.2 and 2.3, only backwards-compatible changes have been made. Full details on compatibility are in our docs. The 2.3 version of those [docs are here](https://docs.mender.io/2.3/architecture/compatibility).

Drew

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**Author:** ![Jerry](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/jerry/32/931_2.png) [@Jerry](https://hub.mender.io/u/Jerry)\
**Post date:** [November 18, 2020, 8:24am UTC](https://hub.mender.io/t/is-there-any-risk-to-upgrade-server-regarding-client-server-synchronization/2845/3 "2020-11-18T08:24:09Z")

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Thank you very much for pointing me to the good ressource.