# Multiversion cluster

**URL:** https://forums.foundationdb.org/t/multiversion-cluster/1503
**Category:** Using FoundationDB
**Created:** [July 3, 2019, 6:05pm UTC](https://forums.foundationdb.org/t/multiversion-cluster/1503 "2019-07-03T18:05:21Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![janderland](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/janderland/32/517_2.png) [@janderland](https://forums.foundationdb.org/u/janderland)
#### Post date: [July 3, 2019, 6:05pm UTC](https://forums.foundationdb.org/t/multiversion-cluster/1503/1 "2019-07-03T18:05:21Z")

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Is it possible to have a cluster made up of servers of different versions? For instance, could I add a 6.1.9 server to a cluster of 5.2.5 servers?

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<div class="post-metadata">

### Author: ![alexmiller](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/alexmiller/32/326_2.png) [@alexmiller](https://forums.foundationdb.org/u/alexmiller)
#### Post date: [July 3, 2019, 6:08pm UTC](https://forums.foundationdb.org/t/multiversion-cluster/1503/2 "2019-07-03T18:08:50Z")

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No. FDB is protocol compatible only within patch versions (so the `z` in `x.y.z`). A 5.2 server will refuse to communicate with a 6.1 server, but a 6.1.0 server will communicate with a 6.1.9 server.