Microsoft has announced Service Pack 1 for  Microsoft SharePoint Server 2013 and Microsoft SharePoint Foundation 2013 in SharePoint Conference 2014 in Las Vegas. SP1 is the latest update for on-premises SharePoint Server 2013.  It includes no. of fixes related to performance, reliability and security.

You can find more details on it from this link. Below are the links to download SharePoint 2013 SP1.

Download Microsoft SharePoint Server 2013 Service Pack 1 (SP1)

Download Microsoft SharePoint Foundation 2013 Service Pack 1 (SP1)

File information SP1 for SharePoint 2013 has been re-released