Heroku push rejected, failed to install gems via Bundler

Question

I am struggling to push my code to Heroku. And after searching on Google and Stack Overflow questions, I have not been able to find the solution. Here is What I get when I t

Answer 1

I don't think it's a Rails version problem, nor is it specific to Heroku. (I hit the same problem today, when running bundle install on my local development machine, with Rails 3.0.3.)

Running bundle update locally, as Andrew suggested, fixes the issue.

Edit: As suggested in the comments: remember to git add ., git commit -m "message"