# Do client and server need to be upgraded simultaneously?

**URL:** <https://discuss.elastic.co/t/do-client-and-server-need-to-be-upgraded-simultaneously/15784>\
**Category:** Elasticsearch\
**Created:** [February 13, 2014, 5:10pm UTC](https://discuss.elastic.co/t/do-client-and-server-need-to-be-upgraded-simultaneously/15784 "2014-02-13T17:10:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![benmccann](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/benmccann/32/420_2.png) [@benmccann](https://discuss.elastic.co/u/benmccann)\
**Post date:** [February 13, 2014, 5:10pm UTC](https://discuss.elastic.co/t/do-client-and-server-need-to-be-upgraded-simultaneously/15784/1 "2014-02-13T17:10:06Z")

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I have a 0.90.11 cluster. I tried upgrading my Java client to 1.0.0 before  
upgrading the server, but the 1.0.0 client seems unable to form a  
connection with the 0.90.11 cluster. Do the client and server both need to  
be running the same version? I was hoping to upgrade one and then the other  
for an easier upgrade path.

Thanks,  
Ben

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**Author:** ![Binh\_Ly](https://avatars.discourse-cdn.com/v4/letter/b/ce7236/32.png) [@Binh\_Ly](https://discuss.elastic.co/u/Binh_Ly)\
**Post date:** [February 13, 2014, 5:16pm UTC](https://discuss.elastic.co/t/do-client-and-server-need-to-be-upgraded-simultaneously/15784/2 "2014-02-13T17:16:50Z")

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Yes if you are using the native Java client.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 1:50am UTC](https://discuss.elastic.co/t/do-client-and-server-need-to-be-upgraded-simultaneously/15784/3 "2017-07-06T01:50:25Z")

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