Index: Src/GoogleApis.Auth.DotNet4/GoogleApis.Auth.DotNet4.csproj
===================================================================
--- a/Src/GoogleApis.Auth.DotNet4/GoogleApis.Auth.DotNet4.csproj
+++ b/Src/GoogleApis.Auth.DotNet4/GoogleApis.Auth.DotNet4.csproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -33,20 +33,16 @@
     <DocumentationFile>Google.Apis.Auth.PlatformServices.xml</DocumentationFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Microsoft.Threading.Tasks, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="Microsoft.Threading.Tasks">
       <HintPath>..\..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll</HintPath>
     </Reference>
-    <Reference Include="Microsoft.Threading.Tasks.Extensions, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions">
       <HintPath>..\..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
-    <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop, Version=1.0.168.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop">
       <HintPath>..\..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll</HintPath>
     </Reference>
-    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="Newtonsoft.Json">
       <HintPath>..\..\packages\Newtonsoft.Json.6.0.4\lib\net40\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="System" />
@@ -59,12 +55,10 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\packages\Microsoft.Net.Http.2.2.22\lib\net40\System.Net.Http.dll</HintPath>
     </Reference>
-    <Reference Include="System.Net.Http.Extensions, Version=2.2.22.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="System.Net.Http.Extensions">
       <HintPath>..\..\packages\Microsoft.Net.Http.2.2.22\lib\net40\System.Net.Http.Extensions.dll</HintPath>
     </Reference>
-    <Reference Include="System.Net.Http.Primitives, Version=2.2.22.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
+    <Reference Include="System.Net.Http.Primitives">
       <HintPath>..\..\packages\Microsoft.Net.Http.2.2.22\lib\net40\System.Net.Http.Primitives.dll</HintPath>
     </Reference>
     <Reference Include="System.Net.Http.WebRequest, Version=2.2.22.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">