WordPress 5.6 will ship with the latest jQuery library next month. This is a major update that all plugin and theme developers should begin testing against. Last week, Marius Jensen announced the change on the Make Core blog.
The following jQuery-related libraries are expected to ship in the update (WordPress Trac ticket):
jQuery 3.5.1jQuery Migrate 3.3.2jQuery UI 1.12.1
This change is not surprising. Lead developer Andrew Ozz