diff --git a/MtApiServiceNetCore/MtApiServiceNetCore.csproj b/MtApiServiceNetCore/MtApiServiceNetCore.csproj
index d6d1827f..c1f26a84 100644
--- a/MtApiServiceNetCore/MtApiServiceNetCore.csproj
+++ b/MtApiServiceNetCore/MtApiServiceNetCore.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net5.0</TargetFramework>
     <OutputType>Library</OutputType>
@@ -44,7 +44,7 @@
   <ItemGroup>
     <PackageReference Include="log4net" Version="2.0.15" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
-    <PackageReference Include="System.ServiceModel.Duplex" Version="4.10.0" />
+    <PackageReference Include="System.ServiceModel.Duplex" Version="6.0.0" />
     <PackageReference Include="System.ServiceModel.NetTcp" Version="4.10.0" />
   </ItemGroup>
   <PropertyGroup />