title: "Unable to find package Microsoft.NETCore.App.Host.osx-x64" after upgrading to .NET Core 3.0
body: <p>Today, <a href="https://devblogs.microsoft.com/dotnet/announcing-net-core-3-0/" rel="nofollow noreferrer">.NET Core 3.0 was released</a>. It became available as an update in my Visual Studio for Mac, and decided to upgrade an ASP.NET Core project from .NET Core 2.2.3 to .NET Core 3.0. I thought it would be as simple as changing the Target framework in the Project Options:</p>
  
  <p><a href="https://i.stack.imgur.com/b49Qe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/b49Qe.png" alt="enter image description here"></a></p>
  
  <p>and updating NuGet packages, but when trying to build the project I got the following error:</p>
  
  <blockquote>
    <p>Unable to find package Microsoft.NETCore.App.Host.osx-x64 with version (= 2.2.3)</p>
  </blockquote>
  
  <p>Cleaning the solution and restarting Visual Studio didn't help; is there somewhere else I have to change the .NET Core version?</p>