diff --git a/Modbus.Net/Modbus.Net.CodeGenerator/Modbus.Net.CodeGenerator.csproj b/Modbus.Net/Modbus.Net.CodeGenerator/Modbus.Net.CodeGenerator.csproj
index e9041c6..bdad474 100644
--- a/Modbus.Net/Modbus.Net.CodeGenerator/Modbus.Net.CodeGenerator.csproj
+++ b/Modbus.Net/Modbus.Net.CodeGenerator/Modbus.Net.CodeGenerator.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.6.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.0" />
   </ItemGroup>
 
 </Project>
diff --git a/Samples/MachineJob.CodeGenerator/MachineJob.CodeGenerator.csproj b/Samples/MachineJob.CodeGenerator/MachineJob.CodeGenerator.csproj
index 7ae8fe2..f9fd585 100644
--- a/Samples/MachineJob.CodeGenerator/MachineJob.CodeGenerator.csproj
+++ b/Samples/MachineJob.CodeGenerator/MachineJob.CodeGenerator.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.6.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.0" />
   </ItemGroup>
 
 
diff --git a/Samples/SampleModbusRtuServer/SampleModbusRtuServer.csproj b/Samples/SampleModbusRtuServer/SampleModbusRtuServer.csproj
index ba01091..dd286a9 100644
--- a/Samples/SampleModbusRtuServer/SampleModbusRtuServer.csproj
+++ b/Samples/SampleModbusRtuServer/SampleModbusRtuServer.csproj
@@ -28,7 +28,6 @@
 
 	<ItemGroup>
 		<ProjectReference Include="..\..\Modbus.Net\Modbus.Net.Modbus\Modbus.Net.Modbus.csproj" />
-		<ProjectReference Include="..\..\Modbus.Net\Modbus.Net.OPC\Modbus.Net.Opc.csproj" />
 		<ProjectReference Include="..\..\Modbus.Net\Modbus.Net.Siemens\Modbus.Net.Siemens.csproj" />
 		<ProjectReference Include="..\..\Modbus.Net\Modbus.Net\Modbus.Net.csproj" />
 		<ProjectReference Include="..\MachineJob.CodeGenerator\MachineJob.CodeGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
diff --git a/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj b/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
index 807224c..3f675d8 100644
--- a/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
+++ b/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
@@ -33,7 +33,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\Modbus.Net\Modbus.Net.Modbus\Modbus.Net.Modbus.csproj" />
-    <ProjectReference Include="..\..\Modbus.Net\Modbus.Net.OPC\Modbus.Net.Opc.csproj" />
     <ProjectReference Include="..\..\Modbus.Net\Modbus.Net.Siemens\Modbus.Net.Siemens.csproj" />
     <ProjectReference Include="..\..\Modbus.Net\Modbus.Net\Modbus.Net.csproj" />
   </ItemGroup>