diff --git a/src/simple-api/src/api/xxENSONOxx.xxSTACKSxx.API.UnitTests/xxENSONOxx.xxSTACKSxx.API.UnitTests.csproj b/src/simple-api/src/api/xxENSONOxx.xxSTACKSxx.API.UnitTests/xxENSONOxx.xxSTACKSxx.API.UnitTests.csproj
index 91e9b75cc..c5c657c07 100644
--- a/src/simple-api/src/api/xxENSONOxx.xxSTACKSxx.API.UnitTests/xxENSONOxx.xxSTACKSxx.API.UnitTests.csproj
+++ b/src/simple-api/src/api/xxENSONOxx.xxSTACKSxx.API.UnitTests/xxENSONOxx.xxSTACKSxx.API.UnitTests.csproj
@@ -11,7 +11,7 @@
         <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0" />
         <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.8" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
         <PackageReference Include="Shouldly" Version="4.2.1" />
         <PackageReference Include="System.DirectoryServices.Protocols" Version="8.0.0" />
         <PackageReference Include="System.Net.Http" Version="4.3.4" />