Ember 2.4 was the release version of Ember during this survey. 76% of participants use Ember 2.x in an app, which demonstrates incredible adoption for a major release. However 36% of developers are still managing a codebase on 1.13. Major semver releases include breaking changes, and a spike on the last 1.x release is expected to some degree. Anecdotal evidence suggests many large companies are just now crossing the threshold into 2.x.

Ember-Data, which did not follow semver until its June release of 1.13, shows a similar trend after that release. Despite a bump at 1.13 (27%) most participants upgrade seamlessly through minor versions. This is a great improvement over last year.