I am a newbie in sitecore. I have install sitecore Version 9.3 and I have the visual studio solution file with version 9.2(it contains sitecore 9.2 pacakges) i need to upgrade all the dependecy package from 9.2 to 9.3 using nuget or nuget console.
Firstly you need to add NuGet feed for Sitecore 9.3
Install-Package Sitecore -Version 9.3.0 -Source https://sitecore.myget.org/F/sc-packages/api/v3/index.json
If you want to update multiple projects, then click on "Manage Nuget Packages for solution" and type dll name and check which project you want to update.