diff --git a/src/MsgPack.CoreWcf.SampleClient/MsgPack.CoreWcf.SampleClient.csproj b/src/MsgPack.CoreWcf.SampleClient/MsgPack.CoreWcf.SampleClient.csproj
index a204b66..75b7c66 100644
--- a/src/MsgPack.CoreWcf.SampleClient/MsgPack.CoreWcf.SampleClient.csproj
+++ b/src/MsgPack.CoreWcf.SampleClient/MsgPack.CoreWcf.SampleClient.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.ServiceModel.Http" Version="4.10.0" />
+    <PackageReference Include="System.ServiceModel.Http" Version="6.0.0" />
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.10.0" />
   </ItemGroup>
 
diff --git a/src/MsgPack.Wcf.Core.SampleClient/MsgPack.Wcf.Core.SampleClient.csproj b/src/MsgPack.Wcf.Core.SampleClient/MsgPack.Wcf.Core.SampleClient.csproj
index c39e92b..46757e7 100644
--- a/src/MsgPack.Wcf.Core.SampleClient/MsgPack.Wcf.Core.SampleClient.csproj
+++ b/src/MsgPack.Wcf.Core.SampleClient/MsgPack.Wcf.Core.SampleClient.csproj
@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.ServiceModel.Duplex" Version="4.10.0" />
-    <PackageReference Include="System.ServiceModel.Http" Version="4.10.0" />
+    <PackageReference Include="System.ServiceModel.Http" Version="6.0.0" />
     <PackageReference Include="System.ServiceModel.NetTcp" Version="4.10.0" />
     <PackageReference Include="System.ServiceModel.Security" Version="4.10.0" />
   </ItemGroup>