Today the Ember project is releasing version 3.21 of Ember.js, Ember Data, and Ember CLI.
Version 3.20 of Ember is now promoted to LTS (Long Term Support). An LTS version of Ember continues to receive security updates for 9 release cycles (54 weeks) and bugfixes for 6 cycles (36 weeks). LTS releases typically occur every four minor versions. The previous LTS version of Ember was 3.16.
This is a companion discussion topic for the original entry at https://emberjs.com/blog/2020/09/02/ember-3-21-released.html