Apple has announced that it is deprecating trust for Symantec roots starting in summer of 2018. Apart from its timing, this program is very similar to that taken by the Chrome and Firefox browsers. In the summer (exact date not specified) Apple will distrust TLS/SSL certificates on all public roots from Symantec issued before June 1, 2016. At a later date, "as early as fall, 2018" Apple will distrust all TLS/SSL certificates on these roots will be distrusted.
Now it a good time to remind all GeoCerts customers with certificates issued prior to December 1, 2017 to take advantage of the free revocation and reissuance offered by DigiCert for these certificates.