Hi,
there should not be any problem. Just as usual do this first on testing environment and check upgrade notes (like ended support of PostgreSQL 9.3) and release notes.
https://confluence.atlassian.com/jirasoftware/jira-software-8-4-x-upgrade-notes-975017731.html
https://confluence.atlassian.com/jirasoftware/jira-software-release-notes-776821069.html#
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