Apologies if this is not the formal way to request a package update.
The latest version on fedora is 16.2.
Thanks.
I think you have to contact fedora maintainer responsible for this particular package. You will Google it easily. In the past I dealt with some other outdated programs and their community is very responsive.
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What @kapitainsky wrote is correct. The Fedora and other packages for various distros are not something that the restic project maintains. They respective authors have to keep their packages up to date 