Service Pack 2 for Microsoft Dynamics GP 2013 is now available!
Do I need to say more?
Service Pack 2 for Microsoft Dynamics GP 2013 is now available! – Dynamics GP Support and Services Blog – Microsoft Dynamics GP – Microsoft Dynamics Community
Microsoft & the GP EcosystemGP 2013
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.