Comment 15 for bug 72125

The /usr/share/zoneinfo/right and /usr/share/zoneinfo/posix subdirectories contain versions of the time zone data with and without counting leap seconds. I don't think you need to worry about it.

The Java and Evolution time zone databases would also need updating. The Java one is probably using the same compiled tzdata format, so you might be able to slot the new file in place (check first). The Evolution one appears to be a translation of an older version of tzdata to iCalendar format, so might require more effort to update.