The Rails Tutorial is at least as up-to-date as Agile Web Development with Rails. For example, two weeks ago I bumped the version of RSpec used in the tutorial,

The Rails Tutorial is at least as up-to-date as Agile Web Development with Rails. For example, two weeks ago I bumped the version of RSpec used in the tutorial, fixing a few minor bugs in the process. Just be sure to use the online version at http://railstutorial.org/book http://railstutorial.org/book or the most recent ebook from http://railstutorial.org/ http://railstutorial.org/ so that you get the freshest copy. If you use the Gemfile at http://railstutorial.org/gemfile http://railstutorial.org/gemfile in a clean Ruby environment and run bundle install, the issue of dependencies shouldn't even come up. If you continue to have trouble, drop me a line at admin@railstutorial.org.