The EF Core tools version '3.1.7' is older than that of the runtime '3.1.8'. Update the tools for the latest features and bug fixes. code example

Example: The EF Core tools version '3.1.0' is older than that of the runtime '3.1.3'

Use command line, Cmd or PowerShell for specific version:

dotnet tool update --global dotnet-ef --version 3.1.0

or

dotnet tool update --global dotnet-ef