The public recursors at 74.82.42.42 / 2001:470:20::2 / ordns.he.net now also support DNS over TLS (DoT) and DNS over HTTPS (DoH) for those who wish to use those interfaces.
How to adjust your applications or local resolver to use that functionality is very dependent on what you're using, so please check with your software's documentation if you decide to use the DoT/DoH access to the recursors.