diff --git a/tests/PostQuantum.AspNetCore.Tests/PostQuantum.AspNetCore.Tests.csproj b/tests/PostQuantum.AspNetCore.Tests/PostQuantum.AspNetCore.Tests.csproj
index bb43486..56f134d 100644
--- a/tests/PostQuantum.AspNetCore.Tests/PostQuantum.AspNetCore.Tests.csproj
+++ b/tests/PostQuantum.AspNetCore.Tests/PostQuantum.AspNetCore.Tests.csproj
@@ -23,7 +23,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.0" />
     <PackageReference Include="xunit.v3" Version="2.0.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />
-    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="NSubstitute" Version="6.0.0" />
     <PackageReference Include="coverlet.collector" Version="6.0.4">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>