diff --git a/test/IncomeTax.Application.Unit/IncomeTax.Application.Unit.csproj b/test/IncomeTax.Application.Unit/IncomeTax.Application.Unit.csproj
index 6c5af88..9251d0a 100644
--- a/test/IncomeTax.Application.Unit/IncomeTax.Application.Unit.csproj
+++ b/test/IncomeTax.Application.Unit/IncomeTax.Application.Unit.csproj
@@ -10,7 +10,7 @@
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+        <PackageReference Include="NSubstitute" Version="6.0.0" />
         <PackageReference Include="NSubstitute.Analyzers.CSharp" Version="1.0.17">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>