Automatic update example script can be found here.

• Download the following file (or use a daily cronjob to do it automatically)

https://raw.githubusercontent.com/notracking/hosts-blocklists/master/unbound/unbound.blacklist.conf 

• Edit and add the following line to unbound.conf

include: "/path/to/unbound.blacklist.conf" 

• Restart unbound (reload will not update list changes) sudo service unbound restart