diff --git a/tests/Directory.Build.props b/tests/Directory.Build.props
index 78b4e10..7dd826f 100644
--- a/tests/Directory.Build.props
+++ b/tests/Directory.Build.props
@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.*" />
     <PackageReference Include="AwesomeAssertions" Version="9.4.*" />
     <PackageReference Include="Verify.TUnit" Version="31.*" />
-    <PackageReference Include="NSubstitute" Version="5.*" />
+    <PackageReference Include="NSubstitute" Version="6.*" />
   </ItemGroup>
 
 </Project>