Directly from the SQL Server Release Service blog, here the latest updates for SQL Server 2016 RTM & SP1:
Cumulative Update #5 for SQL Server 2016 SP1
Cumulative Update #8 for SQL Server 2016 RTM
Starting with SQL Server 2017, the SQL Server releases will follow the Modern Servicing Model, read more here.
Stay Tuned! 🙂
Alessandro Alpi's Blog 