diff --git a/Lib/CustomBuildTasks/CustomBuildTasks.csproj b/Lib/CustomBuildTasks/CustomBuildTasks.csproj
index 1c50a44aa..351e4873f 100644
--- a/Lib/CustomBuildTasks/CustomBuildTasks.csproj
+++ b/Lib/CustomBuildTasks/CustomBuildTasks.csproj
@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>CustomBuildTasks</RootNamespace>
     <AssemblyName>CustomBuildTasks</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
   </PropertyGroup>
@@ -33,7 +33,7 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="Microsoft.Build.Framework" />
-    <Reference Include="Microsoft.Build.Utilities" />
+    <Reference Include="Microsoft.Build.Utilities.v4.0" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="GenerateUniqueIdentifierTask.cs" />
diff --git a/Lib/CustomBuildTasks/CustomBuildTasks.dll b/Lib/CustomBuildTasks/CustomBuildTasks.dll
index 5bc63169d..a6f06156c 100644
Binary files a/Lib/CustomBuildTasks/CustomBuildTasks.dll and b/Lib/CustomBuildTasks/CustomBuildTasks.dll differ