how do i update the sp2010 build version as 14.0.6109.5002

I have a Prod SharePoint 2010 farm with a lower patch level that is 14.0.6029.1000,i have UAT sharepoint2010  farm with higher patch level that is 14.0.6109.5002,i need to attach UAT content databases to Prod 2010 farm

I am unable to attache the DB from UAT to Prod.

Plase help me..