gem 'rails', '~> 4.0.0'```
For best results, use the 2-1-stable branch from GitHub:
gem 'spree', github: 'spree/spree', branch: '2-1-stable'```
Run `bundle update spree`.
## Copy and run migrations
Copy over the migrations from Spree (and any other engine) and run them using
## Read the release notes
For information about changes contained with this release, please read the [2.1.0 Release Notes](http://guides.spreecommerce.org/release_notes/spree_2_1_0.html).
## Verify that everything is OK
Click around in your store and make sure it's performing as normal. Fix any deprecation warnings you see.