Zoom recently announced that version 5.0 is live, and Zoom users need to upgrade by May 30th.
Here are the details sent out recently to all customers:
As you may know, Zoom 5.0 is live! Please update all your clients to version Zoom 5.0 now or before May 30th.
Beginning May 30th, 2020, Zoom will be enabling GCM encryption across the entire Zoom platform, providing increased protection for meeting data.
Please update all your clients to Zoom 5.0. After May 30, 2020, all Zoom clients on older versions will receive a forced update when trying to join meetings as GCM encryption will be fully enabled across the Zoom platform.