Ok, good, then yes, you should be able to upgrade Jira quite a bit, while leaving Confluence as it is.
My worry was that you might be using Jira's user database for Confluence users - if you take Jira higher than 4.2, you have to upgrade Confluence to 3.5 first (or do a really dodgy hack in the Confluence code...)
Be sure to check your target version of Crowd supports Confluence 3.4 AND your target version of Jira.
I am trying an upgrade of JIRA. My actual version is 4.2.4 and I want a newer version (newer than 5.2). But I want to use the same version of Confluence (3.x - as it is now), because I don't want to pay again the plugins for confluence (they are more expensive than the ones for JIRA).
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