diff --git a/AMWD.Protocols.Modbus.Common/InternalsVisibleTo.cs b/AMWD.Protocols.Modbus.Common/InternalsVisibleTo.cs
index 82a8ede..f38a852 100644
--- a/AMWD.Protocols.Modbus.Common/InternalsVisibleTo.cs
+++ b/AMWD.Protocols.Modbus.Common/InternalsVisibleTo.cs
@@ -1,4 +1,4 @@
 using System.Runtime.CompilerServices;
 
-[assembly: InternalsVisibleTo("AMWD.Protocols.Modbus.Tests")]
-[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
+[assembly: InternalsVisibleTo("AMWD.Protocols.Modbus.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100adcc4f9f5bb3ac73cb30661f6f35772b8f90a74412925764a960af06ef125bdcec05ed1d139503d5203fb72aa3fa74bab58e82ac2a6cd4b650f8cbf7086a71bc2dfc67e95b8d26d776d60856acf3121f831529b1a4dee91b34ac84f95f71a1165b7783edb591929ba2a684100c92bbed8859c7266fb507f6f55bb6f7fcac80b4")]
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")]
diff --git a/AMWD.Protocols.Modbus.Serial/AMWD.Protocols.Modbus.Serial.csproj b/AMWD.Protocols.Modbus.Serial/AMWD.Protocols.Modbus.Serial.csproj
index 9cc5e96..4ac33b3 100644
--- a/AMWD.Protocols.Modbus.Serial/AMWD.Protocols.Modbus.Serial.csproj
+++ b/AMWD.Protocols.Modbus.Serial/AMWD.Protocols.Modbus.Serial.csproj
@@ -41,8 +41,4 @@
     <ProjectReference Include="..\AMWD.Protocols.Modbus.Common\AMWD.Protocols.Modbus.Common.csproj" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="Extensions\" />
-  </ItemGroup>
-
 </Project>
diff --git a/AMWD.Protocols.Modbus.snk b/AMWD.Protocols.Modbus.snk
new file mode 100644
index 0000000..4921464
Binary files /dev/null and b/AMWD.Protocols.Modbus.snk differ
diff --git a/Directory.Build.props b/Directory.Build.props
index 3efe4ee..5edfba9 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -25,6 +25,9 @@
     <Authors>Andreas Müller</Authors>
     <Copyright>© {copyright:2018-} AM.WD</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>../AMWD.Protocols.Modbus.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(GITLAB_CI)' == 'true'">