May 11th, 2016: Android Studio 2.1.1 contains a critical security fix. We highly recommend you update to this version for the fix. For additional information about Android Studio, see the main developer site.
The release is available in the stable, beta, and dev channels, so you can check for updates via Help > Check for Update... (on OSX, look in the Android Studio menu). This will download and install a patch rather than download a full IDE image.