diff --git a/source/DefaultDocumentation.Test/DefaultDocumentation.Test.csproj b/source/DefaultDocumentation.Test/DefaultDocumentation.Test.csproj
index 57ba484..f987328 100644
--- a/source/DefaultDocumentation.Test/DefaultDocumentation.Test.csproj
+++ b/source/DefaultDocumentation.Test/DefaultDocumentation.Test.csproj
@@ -20,7 +20,7 @@
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.9" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
     <PackageReference Include="NFluent" Version="3.1.0" />
-    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="NSubstitute" Version="6.0.0" />
     <PackageReference Include="xunit.v3" Version="3.2.2" />
 
     <PackageReference Include="coverlet.msbuild" Version="10.0.1" PrivateAssets="all" />