diff --git a/Test Cases/v4.0/.gitkeep b/Test Cases/v4.0/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/build/Build.cs b/build/Build.cs
index 3234a29..94af66f 100644
--- a/build/Build.cs
+++ b/build/Build.cs
@@ -20,6 +20,6 @@ class Build : NukeBuild
         .Executes(() =>
         {
             var bcfCheckToolPath = NuGetToolPathResolver.GetPackageExecutable("bcf-tool.CommandLine", "tools/net5.0/bcf-tool.dll");
-            BcfTool($"check -q -r v3.0 \"{RootDirectory}\"", workingDirectory: System.IO.Path.GetDirectoryName(bcfCheckToolPath));
+            BcfTool($"check -q -r v4.0 \"{RootDirectory}\"", workingDirectory: System.IO.Path.GetDirectoryName(bcfCheckToolPath));
         });
 }