The EF Core tools version '3.1.2' is older than that of the runtime '3.1.6'. Update the tools for the latest features and bug fixes.

You can either install EF Core tool locally(for target project) or globally(for development environment), check with command

dotnet ef -version

To install

dotnet tool install --global dotnet-ef

To update

dotnet tool update --global dotnet-ef

To uninstall

dotnet tool uninstall --global dotnet-ef