diff --git a/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj b/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj
index dd8b3e05c..8c42d9e77 100644
--- a/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj
+++ b/src/Orchard.Core.Tests/Orchard.Core.Tests.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Orchard.Core.Tests</RootNamespace>
     <AssemblyName>Orchard.Core.Tests</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
@@ -31,6 +31,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -41,6 +42,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -81,6 +83,7 @@
       <HintPath>..\..\lib\sqlite\System.Data.SQLite.DLL</HintPath>
       <Private>True</Private>
     </Reference>
+    <Reference Include="System.Web" />
     <Reference Include="System.Web.Abstractions">
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
diff --git a/src/Orchard.Specs/Orchard.Specs.csproj b/src/Orchard.Specs/Orchard.Specs.csproj
index 212a9a961..1e8d85163 100644
--- a/src/Orchard.Specs/Orchard.Specs.csproj
+++ b/src/Orchard.Specs/Orchard.Specs.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Orchard.Specs</RootNamespace>
     <AssemblyName>Orchard.Specs</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
@@ -31,6 +31,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj b/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj
index 6f0b2f6e3..94c1f54ec 100644
--- a/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj
+++ b/src/Orchard.Tests.Modules/Orchard.Tests.Modules.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Orchard.Tests.Modules</RootNamespace>
     <AssemblyName>Orchard.Tests.Modules</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
@@ -31,6 +31,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -89,6 +90,7 @@
     <Reference Include="System.Web.Abstractions">
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
+    <Reference Include="System.Web.ApplicationServices" />
     <Reference Include="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\lib\aspnetmvc\System.Web.Mvc.dll</HintPath>
diff --git a/src/Orchard.Tests/App.config b/src/Orchard.Tests/App.config
index 5a9770697..033282679 100644
--- a/src/Orchard.Tests/App.config
+++ b/src/Orchard.Tests/App.config
@@ -1,12 +1,12 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0"?>
 <configuration>
   <system.diagnostics>
     <sources>
       <source name="Orchard.Tests.Logging.Thing" switchValue="Warning">
         <listeners>
-          <add name="loopback" type="Orchard.Tests.Logging.InMemoryCapture,Orchard.Framework.Tests"  />
+          <add name="loopback" type="Orchard.Tests.Logging.InMemoryCapture,Orchard.Framework.Tests"/>
         </listeners>
       </source>
     </sources>
   </system.diagnostics>
-</configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
diff --git a/src/Orchard.Tests/Orchard.Framework.Tests.csproj b/src/Orchard.Tests/Orchard.Framework.Tests.csproj
index f1fd1a1a1..0eeee36fe 100644
--- a/src/Orchard.Tests/Orchard.Framework.Tests.csproj
+++ b/src/Orchard.Tests/Orchard.Framework.Tests.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Orchard.Tests</RootNamespace>
     <AssemblyName>Orchard.Framework.Tests</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
@@ -31,6 +31,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -41,6 +42,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj b/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj
index 321ced8a1..a5fbf0eba 100644
--- a/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj
+++ b/src/Orchard.Web.Tests/Orchard.Web.Tests.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Orchard.Web.Tests</RootNamespace>
     <AssemblyName>Orchard.Web.Tests</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
@@ -31,6 +31,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -70,7 +71,6 @@
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
     <Reference Include="System.Web" />
-    <Reference Include="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
     <Reference Include="System.Web.Abstractions" />
     <Reference Include="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>