Today WordPress.org team has been seeded WordPress 3.1.1 to all WordPress self-install user. If you has enabled WordPress notifications and go to your WordPress dashboard. Probably you will get notification about WordPress 3.1.1
WordPress 3.1.1 released with many bugs fixes included
- Security hardening to media uploads (r17569)
- Prevent potential PHP crashes caused by complex hyperlinks (#16892)
- Correct minor XSS flaw on database upgrade screens (r17583)
- Fixed 26 tickets. A breakdown of bug fixes by component can be found on Trac.
If you want updated only selected files that has been changed, you can replace your WordPress old files with the newest one on this files
wp-includes/admin-bar.php wp-includes/taxonomy.php wp-includes/post.php wp-includes/version.php wp-includes/js/tinymce/tiny_mce.js wp-includes/js/tinymce/wp-tinymce.js.gz wp-includes/functions.php wp-includes/query.php wp-includes/link-template.php wp-includes/wp-db.php wp-includes/formatting.php wp-includes/rewrite.php wp-includes/canonical.php wp-includes/css/admin-bar.css wp-includes/css/admin-bar.dev.css wp-includes/script-loader.php wp-includes/meta.php readme.html wp-admin/network.php wp-admin/includes/class-wp-ms-sites-list-table.php wp-admin/includes/dashboard.php wp-admin/includes/class-wp-upgrader.php wp-admin/includes/update-core.php wp-admin/includes/media.php wp-admin/media-upload.php wp-admin/network/settings.php wp-admin/network/admin.php wp-admin/upgrade.php wp-admin/user/admin.php