Microsoft has released the August update for Lync Server 2013 CU 5. Applying the update is pretty much straight forward as the ones that released before this.
The update can be downloaded from below URL. Take a look at the release notes and issues that has been addressed with this update. And most importantly, don’t forget to update the Back End Database.
http://support.microsoft.com/default.aspx?kbid=2809243
Happy updating folks 🙂