diff --git a/appveyor.yml b/appveyor.yml
index cd8ee914..4609eff7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,8 +1,4 @@
-version: 0.20.{build}
-
-# temporary fix for nuget connectivity issues 
-hosts: 
-  api.nuget.org: 93.184.221.200 
+version: 0.21.{build}
 
 pull_requests:
   do_not_increment_build_number: true
diff --git a/source/Serial Test App UWP/project.json b/source/Serial Test App UWP/project.json
index 693e3730..d269c23c 100644
--- a/source/Serial Test App UWP/project.json	
+++ b/source/Serial Test App UWP/project.json	
@@ -1,9 +1,9 @@
 {
   "dependencies": {
-    "Microsoft.NETCore.UniversalWindowsPlatform": "5.3.3"
+    "Microsoft.NETCore.UniversalWindowsPlatform": "5.4.0"
   },
   "frameworks": {
-    "uap10.0": {}
+    "uap10.0.10240": {}
   },
   "runtimes": {
     "win10-arm": {},
diff --git a/source/USB Test App UWP/project.json b/source/USB Test App UWP/project.json
index 693e3730..d269c23c 100644
--- a/source/USB Test App UWP/project.json	
+++ b/source/USB Test App UWP/project.json	
@@ -1,9 +1,9 @@
 {
   "dependencies": {
-    "Microsoft.NETCore.UniversalWindowsPlatform": "5.3.3"
+    "Microsoft.NETCore.UniversalWindowsPlatform": "5.4.0"
   },
   "frameworks": {
-    "uap10.0": {}
+    "uap10.0.10240": {}
   },
   "runtimes": {
     "win10-arm": {},
diff --git a/source/USB Test App WPF/Serial Test App WPF.csproj b/source/USB Test App WPF/Serial Test App WPF.csproj
index 0df9bfea..5a2f2126 100644
--- a/source/USB Test App WPF/Serial Test App WPF.csproj	
+++ b/source/USB Test App WPF/Serial Test App WPF.csproj	
@@ -49,8 +49,8 @@
     <Reference Include="Microsoft.Practices.ServiceLocation, Version=1.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\packages\CommonServiceLocator.1.3\lib\portable-net4+sl5+netcore45+wpa81+wp8\Microsoft.Practices.ServiceLocation.dll</HintPath>
     </Reference>
-    <Reference Include="PropertyChanged, Version=2.1.2.0, Culture=neutral, PublicKeyToken=ee3ee20bcf148ddd, processorArchitecture=MSIL">
-      <HintPath>..\packages\PropertyChanged.Fody.2.1.2\lib\netstandard1.0\PropertyChanged.dll</HintPath>
+    <Reference Include="PropertyChanged, Version=2.1.4.0, Culture=neutral, PublicKeyToken=ee3ee20bcf148ddd, processorArchitecture=MSIL">
+      <HintPath>..\packages\PropertyChanged.Fody.2.1.4\lib\netstandard1.0\PropertyChanged.dll</HintPath>
       <Private>False</Private>
     </Reference>
     <Reference Include="PropertyChanging, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
@@ -59,8 +59,8 @@
     </Reference>
     <Reference Include="System.Data" />
     <Reference Include="System.Runtime" />
-    <Reference Include="System.Threading.Tasks.Extensions, Version=4.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.3.0\lib\portable-net45+win8+wp8+wpa81\System.Threading.Tasks.Extensions.dll</HintPath>
+    <Reference Include="System.Threading.Tasks.Extensions, Version=4.1.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.4.0\lib\portable-net45+win8+wp8+wpa81\System.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
     <Reference Include="System.Windows.Interactivity, Version=4.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\packages\MvvmLightLibs.5.3.0.0\lib\net45\System.Windows.Interactivity.dll</HintPath>
@@ -144,11 +144,11 @@
     </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <Import Project="..\packages\Fody.2.1.0\build\netstandard1.0\Fody.targets" Condition="Exists('..\packages\Fody.2.1.0\build\netstandard1.0\Fody.targets')" />
+  <Import Project="..\packages\Fody.2.1.2\build\netstandard1.0\Fody.targets" Condition="Exists('..\packages\Fody.2.1.2\build\netstandard1.0\Fody.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Fody.2.1.0\build\netstandard1.0\Fody.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Fody.2.1.0\build\netstandard1.0\Fody.targets'))" />
+    <Error Condition="!Exists('..\packages\Fody.2.1.2\build\netstandard1.0\Fody.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Fody.2.1.2\build\netstandard1.0\Fody.targets'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/source/USB Test App WPF/packages.config b/source/USB Test App WPF/packages.config
index 59a74d58..8313f60d 100644
--- a/source/USB Test App WPF/packages.config	
+++ b/source/USB Test App WPF/packages.config	
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="CommonServiceLocator" version="1.3" targetFramework="net462" />
-  <package id="Fody" version="2.1.0" targetFramework="net46" developmentDependency="true" />
+  <package id="Fody" version="2.1.2" targetFramework="net46" developmentDependency="true" />
   <package id="MvvmLight" version="5.3.0.0" targetFramework="net462" />
   <package id="MvvmLightLibs" version="5.3.0.0" targetFramework="net462" />
-  <package id="PropertyChanged.Fody" version="2.1.2" targetFramework="net46" developmentDependency="true" />
-  <package id="PropertyChanging.Fody" version="1.28.0" targetFramework="net462" developmentDependency="true" />
-  <package id="System.Threading.Tasks.Extensions" version="4.3.0" targetFramework="net46" />
   <package id="nanoFramework.CoreLibrary" version="1.0.0-preview022" targetFramework="net46" />
+  <package id="PropertyChanged.Fody" version="2.1.4" targetFramework="net46" developmentDependency="true" />
+  <package id="PropertyChanging.Fody" version="1.28.0" targetFramework="net462" developmentDependency="true" />
+  <package id="System.Threading.Tasks.Extensions" version="4.4.0" targetFramework="net46" />
 </packages>
\ No newline at end of file
diff --git a/source/nanoFramework.Tools.DebugLibrary.Net/nanoFramework.Tools.DebugLibrary.Net.csproj b/source/nanoFramework.Tools.DebugLibrary.Net/nanoFramework.Tools.DebugLibrary.Net.csproj
index f13c0203..634981e5 100644
--- a/source/nanoFramework.Tools.DebugLibrary.Net/nanoFramework.Tools.DebugLibrary.Net.csproj
+++ b/source/nanoFramework.Tools.DebugLibrary.Net/nanoFramework.Tools.DebugLibrary.Net.csproj
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.props" Condition="Exists('..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.props')" />
+  <Import Project="..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.props" Condition="Exists('..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -16,7 +16,7 @@
     <NuGetPackageImportStamp>
     </NuGetPackageImportStamp>
     <PackageId>nanoFramework.Tools.Debugger.Net</PackageId>
-    <PackageVersion>0.4.0-preview020</PackageVersion>
+    <PackageVersion>0.4.0-preview021</PackageVersion>
     <Description>This .NET library provides a debug client for nanoFramework devices using USB or Serial connection to a board.</Description>
     <Authors>nanoFramework project contributors</Authors>
     <Title>nanoFramework debug library for .NET</Title>
@@ -61,11 +61,11 @@ For UWP look for the respective Nuget package.</PackageReleaseNotes>
     <Reference Include="System" />
     <Reference Include="System.Runtime" />
     <Reference Include="System.Runtime.Serialization" />
-    <Reference Include="System.Threading.Tasks.Extensions, Version=4.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.3.0\lib\portable-net45+win8+wp8+wpa81\System.Threading.Tasks.Extensions.dll</HintPath>
+    <Reference Include="System.Threading.Tasks.Extensions, Version=4.1.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.4.0\lib\portable-net45+win8+wp8+wpa81\System.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
-    <Reference Include="System.ValueTuple, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>..\packages\System.ValueTuple.4.3.1\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
+    <Reference Include="System.ValueTuple, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.ValueTuple.4.4.0\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
     </Reference>
     <Reference Include="Windows">
       <HintPath>C:\Program Files (x86)\Windows Kits\10\UnionMetadata\Windows.winmd</HintPath>
@@ -92,9 +92,9 @@ For UWP look for the respective Nuget package.</PackageReleaseNotes>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\UwpDesktop.10.0.14393.3\build\portable-net45+uap\UwpDesktop.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\UwpDesktop.10.0.14393.3\build\portable-net45+uap\UwpDesktop.targets'))" />
-    <Error Condition="!Exists('..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.props'))" />
-    <Error Condition="!Exists('..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.targets'))" />
+    <Error Condition="!Exists('..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.props'))" />
+    <Error Condition="!Exists('..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.targets'))" />
   </Target>
   <Import Project="..\packages\UwpDesktop.10.0.14393.3\build\portable-net45+uap\UwpDesktop.targets" Condition="Exists('..\packages\UwpDesktop.10.0.14393.3\build\portable-net45+uap\UwpDesktop.targets')" />
-  <Import Project="..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.targets" Condition="Exists('..\packages\NuGet.Build.Packaging.0.1.315\build\NuGet.Build.Packaging.targets')" />
+  <Import Project="..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.targets" Condition="Exists('..\packages\NuGet.Build.Packaging.0.2.0\build\NuGet.Build.Packaging.targets')" />
 </Project>
\ No newline at end of file
diff --git a/source/nanoFramework.Tools.DebugLibrary.Net/packages.config b/source/nanoFramework.Tools.DebugLibrary.Net/packages.config
index a4c5d232..8396f7e5 100644
--- a/source/nanoFramework.Tools.DebugLibrary.Net/packages.config
+++ b/source/nanoFramework.Tools.DebugLibrary.Net/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="NuGet.Build.Packaging" version="0.1.315" targetFramework="net46" developmentDependency="true" />
-  <package id="System.Threading.Tasks.Extensions" version="4.3.0" targetFramework="net46" />
-  <package id="System.ValueTuple" version="4.3.1" targetFramework="net46" />
+  <package id="NuGet.Build.Packaging" version="0.2.0" targetFramework="net46" developmentDependency="true" />
+  <package id="System.Threading.Tasks.Extensions" version="4.4.0" targetFramework="net46" />
+  <package id="System.ValueTuple" version="4.4.0" targetFramework="net46" />
   <package id="UwpDesktop" version="10.0.14393.3" targetFramework="net462" />
 </packages>
\ No newline at end of file
diff --git a/source/nanoFramework.Tools.DebugLibrary.UWP/nanoFramework.Tools.DebugLibrary.UWP.csproj b/source/nanoFramework.Tools.DebugLibrary.UWP/nanoFramework.Tools.DebugLibrary.UWP.csproj
index 3e56c04b..43ac0bbe 100644
--- a/source/nanoFramework.Tools.DebugLibrary.UWP/nanoFramework.Tools.DebugLibrary.UWP.csproj
+++ b/source/nanoFramework.Tools.DebugLibrary.UWP/nanoFramework.Tools.DebugLibrary.UWP.csproj
@@ -17,7 +17,7 @@
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <PackageId>nanoFramework.Tools.Debugger.UWP</PackageId>
-    <PackageVersion>0.4.0-preview020</PackageVersion>
+    <PackageVersion>0.4.0-preview021</PackageVersion>
     <Description>This UWP library provides a debug client for nanoFramework devices using USB or Serial connection to a board.</Description>
     <Authors>nanoFramework project contributors</Authors>
     <Title>nanoFramework debug library for UWP</Title>
diff --git a/source/nanoFramework.Tools.DebugLibrary.UWP/project.json b/source/nanoFramework.Tools.DebugLibrary.UWP/project.json
index 853cd9a5..5cb14a6a 100644
--- a/source/nanoFramework.Tools.DebugLibrary.UWP/project.json
+++ b/source/nanoFramework.Tools.DebugLibrary.UWP/project.json
@@ -1,12 +1,12 @@
 {
   "supports": {},
   "dependencies": {
-    "Microsoft.NETCore.UniversalWindowsPlatform": "5.3.3",
-    "NuGet.Build.Packaging": "0.1.315",
-    "System.Threading.Tasks.Extensions": "4.3.0",
-    "System.ValueTuple": "4.3.1"
+    "Microsoft.NETCore.UniversalWindowsPlatform": "5.4.0",
+    "NuGet.Build.Packaging": "0.2.0",
+    "System.Threading.Tasks.Extensions": "4.4.0",
+    "System.ValueTuple": "4.4.0"
   },
   "frameworks": {
-    "uap10.0": {}
+    "uap10.0.10240": {}
   }
 }
\ No newline at end of file