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If you mean you are using Calibre from the Debian repository then you will not be able to do so until Debian update their Calibre release.
It is strongly recommended that Calibre does NOT use the repository installs but instead uses the binary installs available via the Calibre download pages. The repository versions are always a long way out-of-date. Kovid's link shows that the change is now available for those who run Calibre from source. For everyone else it will be available in next Friday's binary Calibre releases.
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