post_upgrade() {
    if (( $(vercmp 1.2.0-2 "$2") > 0 )); then
        cat << __EOF__
Warning: Qt5 5.15 has broken the security sandbox for ebooks with javascript.
If you've enabled javascript support, be aware that untrusted EPUBs can now
exfiltrate user data.  See
https://www.mobileread.com/forums/showthread.php?t=330486
__EOF__
    fi
}
