Yes, you can absolutely upgrade yourself.
Probably best first read through the migration hub documentation https://confluence.atlassian.com/migration/jira-7?tab:platform=1
Since JIRA has been split into 3 different applications you'll need to decide which of the 3 you will end up installing as the 'latest' JIRA version. (or alternatively, upgrade to the latest 6.4 release and then work out what to do about JIRA 7)
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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