diff --git a/Libraries/Nop.Services/Nop.Services.csproj b/Libraries/Nop.Services/Nop.Services.csproj
index c8577cf..ef3ee3e 100644
--- a/Libraries/Nop.Services/Nop.Services.csproj
+++ b/Libraries/Nop.Services/Nop.Services.csproj
@@ -21,7 +21,7 @@
     <PackageReference Include="Microsoft.CSharp" Version="4.4.0" />
     <PackageReference Include="System.Linq.Dynamic" Version="1.0.7" />
     <PackageReference Include="WindowsAzure.Storage" Version="8.5.0" />
-    <PackageReference Include="System.ServiceModel.Duplex" Version="4.4.0" />
+    <PackageReference Include="System.ServiceModel.Duplex" Version="4.4.4" />
     <PackageReference Include="System.ServiceModel.Http" Version="4.4.0" />
     <PackageReference Include="System.ServiceModel.NetTcp" Version="4.4.0" />
     <PackageReference Include="System.ServiceModel.Security" Version="4.4.0" />