diff --git a/.nuget/NuGet.Config b/.nuget/NuGet.Config
index e7814482c..d0b0427aa 100644
--- a/.nuget/NuGet.Config
+++ b/.nuget/NuGet.Config
@@ -5,6 +5,5 @@
   </solution>
   <packageSources>
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="dotnet.myget.org" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
   </packageSources>
 </configuration>
\ No newline at end of file
diff --git a/src/DotNetty.Buffers/DotNetty.Buffers.csproj b/src/DotNetty.Buffers/DotNetty.Buffers.csproj
index 9784eefbd..389e21710 100644
--- a/src/DotNetty.Buffers/DotNetty.Buffers.csproj
+++ b/src/DotNetty.Buffers/DotNetty.Buffers.csproj
@@ -38,6 +38,6 @@
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview2-26312-02" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/DotNetty.Codecs/DotNetty.Codecs.csproj b/src/DotNetty.Codecs/DotNetty.Codecs.csproj
index ab23123ca..35e79d6c7 100644
--- a/src/DotNetty.Codecs/DotNetty.Codecs.csproj
+++ b/src/DotNetty.Codecs/DotNetty.Codecs.csproj
@@ -45,6 +45,6 @@
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26312-02" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/DotNetty.Common/DotNetty.Common.csproj b/src/DotNetty.Common/DotNetty.Common.csproj
index 477bf2779..48aa5b84e 100644
--- a/src/DotNetty.Common/DotNetty.Common.csproj
+++ b/src/DotNetty.Common/DotNetty.Common.csproj
@@ -30,8 +30,8 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.1" />
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview2-26312-02" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26312-02" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview2-26406-04" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
     <PackageReference Include="System.Diagnostics.Contracts" Version="4.3.0" />
@@ -42,9 +42,4 @@
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
-  <ItemGroup>
-    <Reference Include="System.ValueTuple, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
-      <HintPath>C:\Users\mkim\.nuget\packages\system.valuetuple\4.3.0\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
-    </Reference>
-  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/DotNetty.Handlers/DotNetty.Handlers.csproj b/src/DotNetty.Handlers/DotNetty.Handlers.csproj
index ecce653a6..4f14e8361 100644
--- a/src/DotNetty.Handlers/DotNetty.Handlers.csproj
+++ b/src/DotNetty.Handlers/DotNetty.Handlers.csproj
@@ -43,7 +43,6 @@
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview2-26312-02" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26312-02" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/DotNetty.Transport/DotNetty.Transport.csproj b/src/DotNetty.Transport/DotNetty.Transport.csproj
index 183ee2e7b..e9ef2bf15 100644
--- a/src/DotNetty.Transport/DotNetty.Transport.csproj
+++ b/src/DotNetty.Transport/DotNetty.Transport.csproj
@@ -44,6 +44,6 @@
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26312-02" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview2-26406-04" />
   </ItemGroup>
 </Project>
\ No newline at end of file