https://www.preining.info/blog/2020/02/mupdf-qpdfview-and-other-debian-updates/
MuPDF, QPDFView and other Debian updates | There and back again
Update 2020-02-24: The default Debian packages for pupdf and pymupdf have been updated to the current version (or newer), and thus I have removed the packages...
mupdfqpdfviewdebianupdatesback