# Upgrading from 3.5.3 to 3.9.1 **URL:** \ **Category:** Upgrading\ **Created:** [September 19, 2016, 10:12am UTC](https://discuss.aerospike.com/t/upgrading-from-3-5-3-to-3-9-1/3417 "2016-09-19T10:12:40Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![arnaudbriche](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@arnaudbriche](https://discuss.aerospike.com/u/arnaudbriche)\ **Post date:** [September 19, 2016, 10:12am UTC](https://discuss.aerospike.com/t/upgrading-from-3-5-3-to-3-9-1/3417/1 "2016-09-19T10:12:40Z")
Hi all, I’m running a quite old version of Aerospike right now (3.5.3) and planning to upgrade to a more recent one (3.9.1). I wonder if there is any non-backward-compatible changes between these versions, or anything special to know before I run into the upgrade. Also, I’m like to know if I can do a rolling upgrade mixing these versions together in the same cluster for a few day. Thx in advance ---
**Author:** ![kporter](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/kporter/32/515_2.png) [@kporter](https://discuss.aerospike.com/u/kporter)\ **Post date:** [September 20, 2016, 10:01am UTC](https://discuss.aerospike.com/t/upgrading-from-3-5-3-to-3-9-1/3417/2 "2016-09-20T10:01:11Z")
There haven’t been any changes that would prevent an upgrade, though you may not be able to downgrade - please review the applicable [release notes](http://www.aerospike.com/download/server/notes.html). ---
**Author:** ![Tony\_Chung](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/tony_chung/32/1273_2.png) [@Tony\_Chung](https://discuss.aerospike.com/u/Tony_Chung)\ **Post date:** [September 20, 2016, 5:59pm UTC](https://discuss.aerospike.com/t/upgrading-from-3-5-3-to-3-9-1/3417/3 "2016-09-20T17:59:37Z")
1. Would recommend using `asbackup` to backup your data. 2. Try your upgrade using a smaller QA cluster (may be virtual machines.) 3. Consider 3.9.1.1 if using multiple network interfaces as we had a known bug in 3.9.1 - check release notes for details.