CodeIgniter 2.1.3 has released today, bringing some additional security and enhancements to the 2.x stable version. In particular, CodeIgniter 2.1.3 improves IP address resolution in the Input class, preventing spoofing that was possible under certain circumstances. So if you have an application that trusts the visitor’s IP address for access or security, you will want to upgrade. A full list of the changes can be found in the change log, and you can download version 2.1.3 here, and of course, here are upgrade instructions to help you migrate from an older version to the new release.