A new version of Rails was released on Jan
8th to address a security issue. All stacks affected by this are highlighted in your Cloud 66 dashboard.
Please read the Rails team announcement and upgrade your Rails apps source code. Once done, click on the redeploy button and all should be upgraded.
As always, if you want to have a chat or need help, send us an email to firstname.lastname@example.org or drop in our dev chat room.