Always use the most recent release version. There will be no security updates or patches for outdated releases.
If you identify a vulnerability, please consider that this may affect other people/projects as well. This in mind, please email me (Yannic Labonte yannic.labonte@gmail.com) first, so I can react and hopefully fix the issue, before it is published to the public (e.g. in a github issue) and could be misused by a third party.