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.
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