We're tracking Rails 4 compatibility for the major gems we use, based on a bit of skimming GitHub Issues and Pull Requests. Here are the highlights from that l

We're tracking Rails 4 compatibility for the major gems we use, based on a bit of skimming GitHub Issues and Pull Requests. Here are the highlights from that list: CanCan[1] has a '2.0' branch where Rails 4 support is being worked on. It also has PR #838 open for supporting strong_parameters in the current stable 1.6 tree. Devise[2] pushed 3.0.0.rc about a month ago with Rails 4 support. FriendlyId[3] seems to have work in progress on their master branch. Acts-as-taggable-on[4] states in their README that they are compatible in version 2.4.1, but there seem to be a couple open issues related to Rails 4. edit: formatting [1]: https://github.com/ryanb/cancan/ https://github.com/ryanb/cancan/ [2]: https://github.com/plataformatec/devise/ https://github.com/plataformatec/devise/ [3]: https://github.com/FriendlyId/friendly_id https://github.com/FriendlyId/friendly_id [4]: https://github.com/mbleigh/acts-as-taggable-on https://github.com/mbleigh/acts-as-taggable-on