# Temporal Server & Client Compatibility

**URL:** <https://community.temporal.io/t/temporal-server-client-compatibility/9520>\
**Category:** Community Support\
**Tags:** java-sdk\
**Created:** [September 18, 2023, 6:09pm UTC](https://community.temporal.io/t/temporal-server-client-compatibility/9520 "2023-09-18T18:09:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![workflow](https://avatars.discourse-cdn.com/v4/letter/w/58956e/32.png) [@workflow](https://community.temporal.io/u/workflow)\
**Post date:** [September 18, 2023, 6:09pm UTC](https://community.temporal.io/t/temporal-server-client-compatibility/9520/1 "2023-09-18T18:09:08Z")

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Our temporal server version is `1.10.5` and Java client version is `1.14.0`.  
can we use the latest java client [v1.21.1](https://github.com/temporalio/sdk-java/releases/tag/v1.21.1) as clients are backward compatible ? if not, what is the latest client version we can upgrade to?

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**Author:** ![tihomir](https://sea2.discourse-cdn.com/flex016/user_avatar/community.temporal.io/tihomir/32/6580_2.png) [@tihomir](https://community.temporal.io/u/tihomir)\
**Post date:** [September 19, 2023, 2:56am UTC](https://community.temporal.io/t/temporal-server-client-compatibility/9520/2 "2023-09-19T02:56:00Z")

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> Our temporal server version is `1.10.5`

What is preventing you from upgrading, I think you are using a 2+ years old server version.

> can we use the latest java client [v1.21.1](https://github.com/temporalio/sdk-java/releases/tag/v1.21.1)

Believe you should be able to as the core apis have not changed but there would be a lot of features that you would not be able to use unless you also update server version (which i think would be highly recommended)