This guide covers upgrading a 2.3.x Spree store, to a 2.4.x store. This guide has been written from the perspective of a blank Spree 2.3.x store with no extensions.
If you have extensions that your store depends on, you will need to manually verify that each of those extensions work within your 2.4.x store once this upgrade is complete. Typically, extensions that are compatible with this version of Spree will have a 2-4-stable branch.
For this Spree release, you will need to upgrade your Rails version to at least 4.1.8.
gem 'rails', '~> 4.1.8'
For best results, use the 2-4-stable branch from GitHub:
gem 'spree', github: 'spree/spree', branch: '2-4-stable'
bundle update spree.
Copy and run migrations
Copy over the migrations from Spree (and any other engine) and run them using these commands:
rake railties:install:migrations rake db:migrate
Read the release notes
For information about changes contained within this release, please read the 2.4.0 Release Notes.
Verify that everything is OK
Click around in your store and make sure it’s performing as normal. Fix any deprecation warnings you see.