Question: Why is NuGet UI in Visual Studio 2022 not allowing me to upgrade NuGet Packages? It throws an error saying "System.NullReferenceException: Object reference not set to an instance of an object at NuGet.PackageManagement.UI.UIActionEngine.<>c.<ResolveActionsForUpdateAsync>b_9_0(PackageIdentity package)"
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Answer: This error means that there is a package inside the YourProjectName.csproj that is preventing other packages from getting upgraded. Take a look and see if you have a line in YourProjectName.csproj that says:
"<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="5.0.4" />"
If you do, just comment it out if you are not using SQLite in your project, for some reason SQLite was automatically included in the past Project Templates.
I hope this helps you resolve your problem. If not take a look at another article here.