This patch updates the US release of World of Warcraft and its expansion from v3.0.9 to v3.1. It includes The Secrets of Ulduar expansion content among other game enhancements. Patch notes can be found at the official website.
Download World of Warcraft v3.1 Patch [US] (617 MB)
Download World of Warcraft v.3.1 Patch for Mac [US] (739 MB)