Below are some nuget commands related to updating Episerver packages. The commands can be run from Visual Studio's Package Manager Console(Tools > Nuget Package Manager > Package Manager Console).

Show all updates available for solution

get-package -Updates

See all available assembly versions

get-package EPiServer.CMS.Core -ListAvailable -AllVersions

Install specific package version

install-package PackageName -Version X   (where X is the version you wish to update to)

e.g. install-package Episerver.CMS.Core -Version 7.6.0

Install latest version for specific package

install-package PackageName

e.g. install-package EPiServer.CMS.Core