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..1a0e772b7 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
@@ -13,7 +13,7 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />
         <PackageReference Include="Shouldly" Version="4.2.1" />
-        <PackageReference Include="System.DirectoryServices.Protocols" Version="8.0.0" />
+        <PackageReference Include="System.DirectoryServices.Protocols" Version="9.0.9" />
         <PackageReference Include="System.Net.Http" Version="4.3.4" />
         <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
         <!-- Transient packeges:  Referenced explicity due to vulnerabilities in lower versions. -->