Heroku is trying to install sqlite3 gem even it not being in the Gemfile

Question

I\'m trying to deploy a Rails 3.1 application for the first time on Heroku. I set it to the Cedar stack, removed the sqlite3 gem but when I push the code to Heroku I get this er

Answer 1

When I ran into the problem, turns out I'd forgotten to commit my changes after bundle install. Doh! git status should indicate unstaged changes for the gem files.