How to know which gem version to install (Rails 3.2)

I'm using Rails 3.2 and when I'm on github I'm not sure where I can find
the correct version to install for rails 3.2. I'm sure it's simple but I
can't figure it out. For example, Rails_Admin didn't put the css files
in the correct place and I think the reason was because of the incorrect
version.

I’m using Rails 3.2 and when I’m on github I’m not sure where I can find

the correct version to install for rails 3.2.

The correct version of what?

Fred

Look up the gem on rubygems.org. Start with the latest version and inspect the dependencies to ensure it matches your environment. If needed, select an earlier version.

Hi Frederick, I mean if I use a gem I don't know if putting " gem
'gemane' " will cause problems because the newest version of the gem
only works with rails 4. I'm worried I start using gems and the newest
version only works on rails 4 and it causes issues that I can't figure
out.

Thanks James! So just to make sure if one of the dependencies is Rails
4, I would need a previous version?