After the release of WordPress3.1.1 now there is one more upgrade available WordPress 3.1.2

This release addresses a vulnerability that allowed Contributor-level users to improperly publish posts.

We suggest you update to 3.1.2 promptly, especially if you allow users to register as contributors or if you have untrusted users. This release also fixes a few bugs that missed the boat for version 3.1.1.

Have you upgraded your WordPress to 3.1.2 ? If not you can update it directly from dashboard or download it from here . For more information of change log you can refer it here.