diff --git a/test/UnitTests/UnitTests.csproj b/test/UnitTests/UnitTests.csproj
index cb22c8c..9378c1c 100644
--- a/test/UnitTests/UnitTests.csproj
+++ b/test/UnitTests/UnitTests.csproj
@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
-    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="NSubstitute" Version="6.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
       <PrivateAssets>all</PrivateAssets>