Missing bower packages Ember.js 1.11.1 when deploying on Heroku

I've got a problem when I want to deploy an ember-cli app in Heroku.

This is what it's returned to me :

Missing bower packages: 
Package: ember
  * Specified: 1.11.1
  * Installed: 1.11.0

Run `bower install` to install missing dependencies.

On my computer, in localhost, it works fine when I do ember serve in the terminal. ember build works too.

The problem occured when I wanted to update from ember 1.11.0 to 1.11.1. I wanted to go back and use the previous version of ember (1.11.0) but the problem remains.

Someone has an idea ?