Today the Ember project is releasing version 5.5 of Ember.js and Ember CLI.
Version 5.4 of Ember.js and version 5.3 of EmberData are 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.js was 4.12 and the previous LTS version of EmberData was also 4.12.