https://www.debian.org/releases/
There are multiple versions of Debian. Debian Stable, has calibre 2.75
Debian Testing, codenamed Buster, has calibre 3.15, as does Debian Unstable, codenamed sid.
https://wiki.debian.org/DebianReleases#Codenames
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Releases of the Debian distribution have both traditional version numbers and codenames based on characters from the Pixar/Disney movie "Toy Story" (1995). Sid, as you may recall, was the evil neighbor kid who broke all the toys. Additionally, the codename for the Experimental repository, RC-Buggy, was Andy's toy car, and is a pun on 'Release Critical' and 'Remote Control.'
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Do you feel comfortable using sid? If so, then by all means, update to a newer version of Debian!
BUT. If you know enough about Linux to use it, but not to understand the nitty-gritty details or evaluate the stability of a release cycle, do you really want to experiment with the less than perfectly safe versions?
I think the best move for you is to wait until Buster is released, then update to the latest version of Debian. That may take a while.