# dotnet


11/30/2021, 3:54 PM
I am trying to upgrade to more recent versions of Pulumi.Aws and was previously using an old version 3.35. I have a separate networking stack that is reference by an application stack. I have found it impossible to upgrade to the latest versions but have managed to upgrade to Pulumi.Aws 4.5.1. Going to version 4.6.0 in the networking stack means the application stack then hangs when reading the stack reference on a pulumi up. I have tried explicitly referencing later versions of Pulumi in case there is an issue here. Starting to run out of things to try. Has anyone had these issues where they reference another stack and it hangs when running the CLI in preview mode? Any ideas how to diagnose?