WordPress 3.1.1 is available to download or upgrade for self hosted WordPress package. This is a security and maintenance update covering around 30 issues and tickets raised by users. After WordPress 3.1 update, few people were seeing 404 error for posts using category in the permalink. And some users also reported issues with the newly added admin bar in WordPress 3.1.
You can download the latest version i.e. WordPress 3.1.1 from the official download page or you can upgrade from the dashboard as well. If you are doing it manually, then you will have to replace all the existing files of WordPress with latest version. In case of auto-upgrade, you just need to hit the “Auto upgrade” link available on dashboard.
WordPress 3.1.1 is having solution for the security issues related to media uploads. It will also boost the site performance. There are few fixes related to IIS6 support, taxonomy and PATHINFO permalinks.
Upgrade your WordPress blog to the latest version to keep it safe and secured.