diff --git a/Cake.ArgumentHelpers/Cake.ArgumentHelpers.csproj b/Cake.ArgumentHelpers/Cake.ArgumentHelpers.csproj
index f536c7c..5eeae28 100644
--- a/Cake.ArgumentHelpers/Cake.ArgumentHelpers.csproj
+++ b/Cake.ArgumentHelpers/Cake.ArgumentHelpers.csproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="4.0" 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>
@@ -32,12 +32,6 @@
     <DocumentationFile>bin\Release\Cake.ArgumentHelpers.xml</DocumentationFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Cake.Common, Version=0.20.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Cake.Common.0.20.0\lib\net45\Cake.Common.dll</HintPath>
-    </Reference>
-    <Reference Include="Cake.Core, Version=0.20.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Cake.Core.0.20.0\lib\net45\Cake.Core.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
@@ -46,6 +40,12 @@
     <Reference Include="System.Data" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
+    <Reference Include="Cake.Core">
+      <HintPath>..\packages\Cake.Core.0.21.0\lib\net45\Cake.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="Cake.Common">
+      <HintPath>..\packages\Cake.Common.0.21.0\lib\net45\Cake.Common.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ArgumentOrEnvironmentVariableAlias.cs" />
diff --git a/Cake.ArgumentHelpers/packages.config b/Cake.ArgumentHelpers/packages.config
index 4d5d9e1..a9df941 100644
--- a/Cake.ArgumentHelpers/packages.config
+++ b/Cake.ArgumentHelpers/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Cake.Common" version="0.20.0" targetFramework="net452" />
-  <package id="Cake.Core" version="0.20.0" targetFramework="net452" />
+  <package id="Cake.Common" version="0.21.0" targetFramework="net45" />
+  <package id="Cake.Core" version="0.21.0" targetFramework="net45" />
 </packages>
\ No newline at end of file