diff --git a/deployment/owin-scim-host/owin-scim-host.csproj b/deployment/owin-scim-host/owin-scim-host.csproj
index 4b75799..1d70406 100644
--- a/deployment/owin-scim-host/owin-scim-host.csproj
+++ b/deployment/owin-scim-host/owin-scim-host.csproj
@@ -25,6 +25,7 @@
     <UseGlobalApplicationHostFile />
     <NuGetPackageImportStamp>
     </NuGetPackageImportStamp>
+    <Use64BitIISExpress />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -48,9 +49,8 @@
       <HintPath>..\..\Packages\Antlr.3.5.0.2\lib\Antlr3.Runtime.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="Antlr4.Runtime, Version=4.5.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
-      <HintPath>..\..\Packages\Antlr4.Runtime.4.5.3\lib\net45\Antlr4.Runtime.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Antlr4.Runtime, Version=4.6.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
+      <HintPath>..\..\Packages\Antlr4.Runtime.4.6.6\lib\net45\Antlr4.Runtime.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>..\..\Packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.1.0.2\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
diff --git a/deployment/owin-scim-host/packages.config b/deployment/owin-scim-host/packages.config
index 9d5c7af..1ef99af 100644
--- a/deployment/owin-scim-host/packages.config
+++ b/deployment/owin-scim-host/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Antlr" version="3.5.0.2" targetFramework="net452" />
-  <package id="Antlr4.Runtime" version="4.5.3" targetFramework="net452" />
+  <package id="Antlr4.Runtime" version="4.6.6" targetFramework="net452" />
   <package id="bootstrap" version="3.3.7" targetFramework="net452" />
   <package id="jQuery" version="2.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net452" />
diff --git a/samples/ConsoleHost/ConsoleHost/ConsoleHost.csproj b/samples/ConsoleHost/ConsoleHost/ConsoleHost.csproj
index c3ec9ed..3a63907 100644
--- a/samples/ConsoleHost/ConsoleHost/ConsoleHost.csproj
+++ b/samples/ConsoleHost/ConsoleHost/ConsoleHost.csproj
@@ -34,9 +34,8 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Antlr4.Runtime, Version=4.5.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
-      <HintPath>..\..\..\Packages\Antlr4.Runtime.4.5.3\lib\net45\Antlr4.Runtime.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Antlr4.Runtime, Version=4.6.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
+      <HintPath>..\..\..\Packages\Antlr4.Runtime.4.6.6\lib\net45\Antlr4.Runtime.dll</HintPath>
     </Reference>
     <Reference Include="Autofac, Version=4.2.1.0, Culture=neutral, PublicKeyToken=17863af14b0044da, processorArchitecture=MSIL">
       <HintPath>..\..\..\Packages\Autofac.4.2.1\lib\net45\Autofac.dll</HintPath>
diff --git a/samples/ConsoleHost/ConsoleHost/packages.config b/samples/ConsoleHost/ConsoleHost/packages.config
index c43619e..84b3932 100644
--- a/samples/ConsoleHost/ConsoleHost/packages.config
+++ b/samples/ConsoleHost/ConsoleHost/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Antlr4.Runtime" version="4.5.3" targetFramework="net451" />
+  <package id="Antlr4.Runtime" version="4.6.6" targetFramework="net451" />
   <package id="Autofac" version="4.2.1" targetFramework="net451" />
   <package id="AutoMapper" version="5.2.0" targetFramework="net451" />
   <package id="FluentValidation" version="6.2.1.0" targetFramework="net451" />
diff --git a/source/Owin.Scim.Antlr/Owin.Scim.Antlr.csproj b/source/Owin.Scim.Antlr/Owin.Scim.Antlr.csproj
index 9148249..194e5c5 100644
--- a/source/Owin.Scim.Antlr/Owin.Scim.Antlr.csproj
+++ b/source/Owin.Scim.Antlr/Owin.Scim.Antlr.csproj
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\Packages\Antlr4.4.5.3\build\Antlr4.props" Condition="Exists('..\..\Packages\Antlr4.4.5.3\build\Antlr4.props')" />
+  <Import Project="..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.props" Condition="Exists('..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -36,9 +36,8 @@
     <DocumentationFile>..\lib\Owin.Scim.Antlr.xml</DocumentationFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Antlr4.Runtime, Version=4.5.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
-      <HintPath>..\..\Packages\Antlr4.Runtime.4.5.3\lib\net45\Antlr4.Runtime.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Antlr4.Runtime, Version=4.6.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
+      <HintPath>..\..\Packages\Antlr4.Runtime.4.6.6\lib\net45\Antlr4.Runtime.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
@@ -61,23 +60,21 @@
     </Antlr4>
   </ItemGroup>
   <ItemGroup>
-    <None Include="packages.config">
-      <SubType>Designer</SubType>
-    </None>
+    <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <PropertyGroup>
+    <PostBuildEvent>
+    </PostBuildEvent>
+  </PropertyGroup>
   <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\Antlr4.4.5.3\build\Antlr4.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\Packages\Antlr4.4.5.3\build\Antlr4.props'))" />
-    <Error Condition="!Exists('..\..\Packages\Antlr4.4.5.3\build\Antlr4.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\Packages\Antlr4.4.5.3\build\Antlr4.targets'))" />
+    <Error Condition="!Exists('..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.props'))" />
+    <Error Condition="!Exists('..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.targets'))" />
   </Target>
-  <Import Project="..\..\Packages\Antlr4.4.5.3\build\Antlr4.targets" Condition="Exists('..\..\Packages\Antlr4.4.5.3\build\Antlr4.targets')" />
-  <PropertyGroup>
-    <PostBuildEvent>
-    </PostBuildEvent>
-  </PropertyGroup>
+  <Import Project="..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.targets" Condition="Exists('..\..\Packages\Antlr4.CodeGenerator.4.6.6\build\Antlr4.CodeGenerator.targets')" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">
diff --git a/source/Owin.Scim.Antlr/packages.config b/source/Owin.Scim.Antlr/packages.config
index 1544408..116cd86 100644
--- a/source/Owin.Scim.Antlr/packages.config
+++ b/source/Owin.Scim.Antlr/packages.config
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Antlr4" version="4.5.3" targetFramework="net45" developmentDependency="true" />
-  <package id="Antlr4.Runtime" version="4.5.3" targetFramework="net45" />
+  <package id="Antlr4" version="4.6.6" targetFramework="net45" developmentDependency="true" />
+  <package id="Antlr4.CodeGenerator" version="4.6.6" targetFramework="net45" developmentDependency="true" />
+  <package id="Antlr4.Runtime" version="4.6.6" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/source/Owin.Scim/Owin.Scim.csproj b/source/Owin.Scim/Owin.Scim.csproj
index cfe13d3..edc3c9c 100644
--- a/source/Owin.Scim/Owin.Scim.csproj
+++ b/source/Owin.Scim/Owin.Scim.csproj
@@ -37,9 +37,8 @@
     <LangVersion>5</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Antlr4.Runtime, Version=4.5.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
-      <HintPath>..\..\Packages\Antlr4.Runtime.4.5.3\lib\net45\Antlr4.Runtime.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Antlr4.Runtime, Version=4.6.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
+      <HintPath>..\..\Packages\Antlr4.Runtime.4.6.6\lib\net45\Antlr4.Runtime.dll</HintPath>
     </Reference>
     <Reference Include="FluentValidation, Version=6.2.1.0, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>..\..\Packages\FluentValidation.6.2.1.0\lib\Net45\FluentValidation.dll</HintPath>
diff --git a/source/Owin.Scim/packages.config b/source/Owin.Scim/packages.config
index c46da5e..3cabd71 100644
--- a/source/Owin.Scim/packages.config
+++ b/source/Owin.Scim/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Antlr4.Runtime" version="4.5.3" targetFramework="net451" />
+  <package id="Antlr4.Runtime" version="4.6.6" targetFramework="net451" />
   <package id="DryIoc" version="2.5.1" targetFramework="net451" developmentDependency="true" />
   <package id="DryIoc.Owin" version="2.0.1" targetFramework="net451" developmentDependency="true" />
   <package id="DryIoc.WebApi" version="2.1.0" targetFramework="net451" developmentDependency="true" />
diff --git a/source/_tests/Owin.Scim.Tests/Owin.Scim.Tests.csproj b/source/_tests/Owin.Scim.Tests/Owin.Scim.Tests.csproj
index 9f25e08..66dfd00 100644
--- a/source/_tests/Owin.Scim.Tests/Owin.Scim.Tests.csproj
+++ b/source/_tests/Owin.Scim.Tests/Owin.Scim.Tests.csproj
@@ -33,9 +33,8 @@
     <LangVersion>5</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Antlr4.Runtime, Version=4.5.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
-      <HintPath>..\..\..\Packages\Antlr4.Runtime.4.5.3\lib\net45\Antlr4.Runtime.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Antlr4.Runtime, Version=4.6.0.0, Culture=neutral, PublicKeyToken=09abb75b9ed49849, processorArchitecture=MSIL">
+      <HintPath>..\..\..\Packages\Antlr4.Runtime.4.6.6\lib\net45\Antlr4.Runtime.dll</HintPath>
     </Reference>
     <Reference Include="FakeItEasy, Version=2.3.1.0, Culture=neutral, PublicKeyToken=eff28e2146d5fd2c, processorArchitecture=MSIL">
       <HintPath>..\..\..\Packages\FakeItEasy.2.3.1\lib\net40\FakeItEasy.dll</HintPath>
diff --git a/source/_tests/Owin.Scim.Tests/packages.config b/source/_tests/Owin.Scim.Tests/packages.config
index 53497a7..3596124 100644
--- a/source/_tests/Owin.Scim.Tests/packages.config
+++ b/source/_tests/Owin.Scim.Tests/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Antlr4.Runtime" version="4.5.3" targetFramework="net451" />
+  <package id="Antlr4.Runtime" version="4.6.6" targetFramework="net451" />
   <package id="AutoFixture" version="3.50.2" targetFramework="net451" />
   <package id="FakeItEasy" version="2.3.1" targetFramework="net451" />
   <package id="FluentValidation" version="6.2.1.0" targetFramework="net451" />