diff --git a/Tests/Opc.Ua.Client.ComplexTypes.Tests/Opc.Ua.Client.ComplexTypes.Tests.csproj b/Tests/Opc.Ua.Client.ComplexTypes.Tests/Opc.Ua.Client.ComplexTypes.Tests.csproj
index e2bcafa758..6d30ce67c5 100644
--- a/Tests/Opc.Ua.Client.ComplexTypes.Tests/Opc.Ua.Client.ComplexTypes.Tests.csproj
+++ b/Tests/Opc.Ua.Client.ComplexTypes.Tests/Opc.Ua.Client.ComplexTypes.Tests.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.Client.Tests/Opc.Ua.Client.Tests.csproj b/Tests/Opc.Ua.Client.Tests/Opc.Ua.Client.Tests.csproj
index ba8ce873f2..d27fa4f250 100644
--- a/Tests/Opc.Ua.Client.Tests/Opc.Ua.Client.Tests.csproj
+++ b/Tests/Opc.Ua.Client.Tests/Opc.Ua.Client.Tests.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.Configuration.Tests/Opc.Ua.Configuration.Tests.csproj b/Tests/Opc.Ua.Configuration.Tests/Opc.Ua.Configuration.Tests.csproj
index 2bf6baa453..438972afcb 100644
--- a/Tests/Opc.Ua.Configuration.Tests/Opc.Ua.Configuration.Tests.csproj
+++ b/Tests/Opc.Ua.Configuration.Tests/Opc.Ua.Configuration.Tests.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.Core.Tests/Opc.Ua.Core.Tests.csproj b/Tests/Opc.Ua.Core.Tests/Opc.Ua.Core.Tests.csproj
index 3275c23a16..98f991ff31 100644
--- a/Tests/Opc.Ua.Core.Tests/Opc.Ua.Core.Tests.csproj
+++ b/Tests/Opc.Ua.Core.Tests/Opc.Ua.Core.Tests.csproj
@@ -9,9 +9,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.IO.RecyclableMemoryStream" Version="2.2.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="Moq" Version="4.18.3" />
-    <PackageReference Include="EmbedIO" Version="3.5.2" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
@@ -23,7 +22,15 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
   </ItemGroup>
-  
+
+  <PropertyGroup Condition="'$(SignAssembly)' == 'true'">
+    <DefineConstants>$(DefineConstants);SIGNASSEMBLY</DefineConstants>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(SignAssembly)' != 'true'">
+    <PackageReference Include="EmbedIO" Version="3.5.2" />
+  </ItemGroup>
+
   <ItemGroup>
     <Compile Include="..\Common\Main.cs" />
   </ItemGroup>
diff --git a/Tests/Opc.Ua.Core.Tests/Security/Certificates/CertificateValidatorAlternate.cs b/Tests/Opc.Ua.Core.Tests/Security/Certificates/CertificateValidatorAlternate.cs
index f57fab3d40..123930124f 100644
--- a/Tests/Opc.Ua.Core.Tests/Security/Certificates/CertificateValidatorAlternate.cs
+++ b/Tests/Opc.Ua.Core.Tests/Security/Certificates/CertificateValidatorAlternate.cs
@@ -27,6 +27,8 @@
  * http://opcfoundation.org/License/MIT/1.00/
  * ======================================================================*/
 
+#if !SIGNASSEMBLY
+
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -404,3 +406,4 @@ namespace Opc.Ua.Core.Tests.Security.Certificates
         }
     }
 }
+#endif
diff --git a/Tests/Opc.Ua.Gds.Tests/Opc.Ua.Gds.Tests.csproj b/Tests/Opc.Ua.Gds.Tests/Opc.Ua.Gds.Tests.csproj
index 40d4873dbe..d3bd19ccef 100644
--- a/Tests/Opc.Ua.Gds.Tests/Opc.Ua.Gds.Tests.csproj
+++ b/Tests/Opc.Ua.Gds.Tests/Opc.Ua.Gds.Tests.csproj
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.PubSub.Tests/Opc.Ua.PubSub.Tests.csproj b/Tests/Opc.Ua.PubSub.Tests/Opc.Ua.PubSub.Tests.csproj
index cec411b0ed..959885d5a5 100644
--- a/Tests/Opc.Ua.PubSub.Tests/Opc.Ua.PubSub.Tests.csproj
+++ b/Tests/Opc.Ua.PubSub.Tests/Opc.Ua.PubSub.Tests.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.Security.Certificates.Tests/Opc.Ua.Security.Certificates.Tests.csproj b/Tests/Opc.Ua.Security.Certificates.Tests/Opc.Ua.Security.Certificates.Tests.csproj
index bc3989d2ef..820136c12c 100644
--- a/Tests/Opc.Ua.Security.Certificates.Tests/Opc.Ua.Security.Certificates.Tests.csproj
+++ b/Tests/Opc.Ua.Security.Certificates.Tests/Opc.Ua.Security.Certificates.Tests.csproj
@@ -24,7 +24,7 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1">
diff --git a/Tests/Opc.Ua.Server.Tests/Opc.Ua.Server.Tests.csproj b/Tests/Opc.Ua.Server.Tests/Opc.Ua.Server.Tests.csproj
index 0deebb53e0..433fef4d5e 100644
--- a/Tests/Opc.Ua.Server.Tests/Opc.Ua.Server.Tests.csproj
+++ b/Tests/Opc.Ua.Server.Tests/Opc.Ua.Server.Tests.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="Moq" Version="4.18.3" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Console" Version="3.16.0" />