Zcash Moves Closer to First-Ever Hard Fork
The software finds zcash's developer team moving to fortify its technology in anticipation of future updates. Due to the nature of the code, which will be enacted via a mechanism called a hard fork, all users will be required to make the shift.
Source
https://www.coindesk.com/overwinter-approaching-zcash-moves-closer-first-ever-hard-fork/
I usually just put my coins in a mobile wallet I trust or an online exchange during thus update then send them to a new fresh address.