https://support.microsoft.com/en-gb/topic/december-5-2017-update-for-excel-2016-kb4011577-056d2964-95ee-2df6-4c2a-19046e198ecf
December 5, 2017, update for Excel 2016 (KB4011577) - Microsoft Support
Describes the Excel 2016 update (KB4011577) that was released on December 5, 2017.
for exceldecemberupdatemicrosoftsupport