WordPress has recently released its latest update: WordPress 3.9.1 version. This is a maintenance release for all previous versions. According to WordPress.org, the latest version fixes the following:
- Various fixes for multisite networks, customizing widgets while previewing themes, and the updated visual editor.
- Audio/video playlists feature enhancement
Since this is only a maintenance update, your WordPress may have been updated automatically (depending on the existing version of WordPress you have). But to ensure your WordPress website is updated, it is recommended to log in to your site and check if update is required. To update, log in to your WordPress dashboard and the update button is listed on top of the browser. To learn more about the update, please read this blog post from WordPress.org.