diff --git a/Tests/Nalu.SharpState.Tests/Nalu.SharpState.Tests.csproj b/Tests/Nalu.SharpState.Tests/Nalu.SharpState.Tests.csproj
index c63c307..cdb0c4e 100644
--- a/Tests/Nalu.SharpState.Tests/Nalu.SharpState.Tests.csproj
+++ b/Tests/Nalu.SharpState.Tests/Nalu.SharpState.Tests.csproj
@@ -31,7 +31,7 @@
         </PackageReference>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
-        <PackageReference Include="NSubstitute" Version="5.3.0" />
+        <PackageReference Include="NSubstitute" Version="6.1.0" />
         <PackageReference Include="NSubstitute.Analyzers.CSharp" PrivateAssets="all" Version="1.0.17">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>