Make sure you update spigot as this version uses a recently-added API. Also, make sure you backup the GriefPreventionData folder (you're already doing that, right?) as there is a database change in this version; you know, just in case.
edit: Fyi this is 1.13 compatible.
Happy Advent, and Merry Christmas (in 2 days)!
As mentioned before, clicking download will bring you to the downloads as well as the changelog.