Dotnet tools do not auto update so you are responsible for making sure you're up-to-date. To help with this stryker will notify you when a new version is available
To update stryker as a global tool run
dotnet tool update --global dotnet-stryker
To update stryker as a project tool run
dotnet tool update --local dotnet-stryker or change the version in the
dotnet-tools.json file. Then check in the updated
dotnet-tools.json file to version control.