Rails version automatically downgraded

Yesterday I installed Ubuntu on my PC and installed the latest version of rails. It worked successfully and I was able to create an app. Th开发者_Python百科e version installed was 3.0.5 I believe. Today rails -v returns 2.3.5. Anyone know why it would make that change?

It would change if you ran gem install rails -v 2.3.5 or something similar. You can fix it by running gem install rails -v 3.0.5.