ember-notify | Notification messages for your Ember.js app | Notification library

The problem you had is most probably using ^ for your dependencies. What ^ (caret) does is upgrading your dependencies to a major version when you do a clean install. For instance if your dependency to an addon is let's say 1.2.0 and you used ^1.2.0 and there is a new version available 1.3.0, you will get this new major version. If you use ~ (tilda) instead of ^, then you will not get 1.3.0 but 1.2.2 for instance if available. In order to use the exact versions so that your dependencies will not change when you do a clean npm install, you can remove both caret and tilda in your dependency definitions.

In order to figure out which of your dependencies is outdated you can use npm outdated.