Serene template contains references to following Serenity NuGet packages:
Serenity.Core
Serenity.Data
Serenity.Data.Entity
Serenity.Services
Serenity.Web
Serenity.CodeGenerator
To update Serenity packages to latest version, open package manager console (click View -> Other Windows -> Package Manager Console).
And type following:
Update-Package Serenity.Web
Update-Package Serenity.CodeGenerator
Updating these three packages will also update others (because of dependencies).