diff --git a/SampleApplications/Workshop/Reference/Server/Reference Server.csproj b/SampleApplications/Workshop/Reference/Server/Reference Server.csproj
index 09422f9e55..c23451f173 100644
--- a/SampleApplications/Workshop/Reference/Server/Reference Server.csproj	
+++ b/SampleApplications/Workshop/Reference/Server/Reference Server.csproj	
@@ -151,6 +151,11 @@
       <Name>Opc.Ua.Server</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="System.Security.Cryptography.X509Certificates">
+      <Version>4.3.0</Version>
+    </PackageReference>
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>