Some days ago, precisely on 13th of July, Microsoft has released an update for Microsoft SharePoint Foundation 2010, described in this KB:
http://support.microsoft.com/kb/2032588

The update was made in automatic ny Microsoft Update, so you can find it into this month automatic updates. Once installed, you can view tha the Microsoft.SharePoint.dll libraries was port to the number: 14.0.5050.5001
It seems that the update was released for a file missing.

Remember to run "SharePoint Products and Tecnologies Configuration Wizard" tool before the update installation.