I’ve ignored the course recommendation to use Rails 1.9.3 and Rails 3.2.12. I also tend to use the latest versions of other gems, though I’m pretty quick to dial back a gem if I find an incompatibility. I do maintain a “course standard” environment to test against so I don’t misuse thoughtbot resources with these practices.
I’ll document changes I run into. Please add any you find too. Make sure to include relevant version numbers and links to docs if you can. If appropriate, note which class video and approximate time.