A new breed of Tiki has been released a week ago and the Tiki Community urge every user to update as it solve critical security issues. LTS (Long Term Services) versions are concerned, 12.x and 15.x, as well as the under going development 16.x branch so you got no excuses. With so many improvement and a few regression and bug fixes it is in your best interest to upgrade as those version not only contain security fixes but hundreds of small improvement, enhancement and regressions fixes.
The process is pretty smooth and doesn’t require that much knowledge thanks to the Tiki Install/Update process and your data will be safer as well as your files. As usual do backup of your database and if you feel it is too complicate for you ask from the Tiki Community for help, contact me or check the Tiki consultant list to have it done.