++++++++++++++ WARNING ++++++++++++++<p>If you're hosting the servers yourself, not the datacenter versions, then you need to be <i>very careful</i> about how much you upgrade.<p>Jira, yes, you can upgrade that to the latest version, which is 9.11.<p>I did the same with Bitbucket and after the upgrade it told me that I have a server license but need a datacenter license for this latest version, which is 8.15. You can only upgrade up to 8.14 [0]. Luckily the downgrade from 8.15 to 8.14 is easy and there are instructions for it [1].<p>So I checked the upgrade matrix for Confluence [2] to make sure that I won't have the same issues as with Bitbucket, but these huge, tremendous idiots at Atlassian don't mention a single word about 8.5 being the last version to support server licenses, all above that requires datacenter licenses. I say idiots, because in the upgrade matrix from Bitbucket they highlight this requirement with bold text, in the one from Confluence they don't even care mention it.<p>[0] <a href="https://confluence.atlassian.com/bitbucketserver/upgrade-matrix-966065971.html" rel="nofollow noreferrer">https://confluence.atlassian.com/bitbucketserver/upgrade-mat...</a><p>[1] <a href="https://confluence.atlassian.com/bitbucketserver/downgrade-bitbucket-when-upgrading-with-server-license-to-bitbucket-data-center-8-15+-1305971302.html" rel="nofollow noreferrer">https://confluence.atlassian.com/bitbucketserver/downgrade-b...</a><p>[2] <a href="https://confluence.atlassian.com/doc/confluence-upgrade-matrix-960695895.html" rel="nofollow noreferrer">https://confluence.atlassian.com/doc/confluence-upgrade-matr...</a><p>[3] <a href="https://confluence.atlassian.com/doc/confluence-8-5-release-notes-1252010185.html" rel="nofollow noreferrer">https://confluence.atlassian.com/doc/confluence-8-5-release-...</a>