diff --git a/dev/Generated/FontIconSource.properties.cpp b/dev/Generated/FontIconSource.properties.cpp
index a5901cca32..f46a0f369b 100644
--- a/dev/Generated/FontIconSource.properties.cpp
+++ b/dev/Generated/FontIconSource.properties.cpp
@@ -32,7 +32,7 @@ void FontIconSourceProperties::EnsureProperties()
                 winrt::name_of<winrt::FontFamily>(),
                 winrt::name_of<winrt::FontIconSource>(),
                 false /* isAttached */,
-                ValueHelper<winrt::FontFamily>::BoxValueIfNecessary({ c_fontIconSourceDefaultFontFamily }),
+                ValueHelper<winrt::FontFamily>::BoxValueIfNecessary(winrt::FontFamily{ c_fontIconSourceDefaultFontFamily }),
                 nullptr);
     }
     if (!s_FontSizeProperty)
diff --git a/dev/IconSource/IconSource.idl b/dev/IconSource/IconSource.idl
index 447d25b52a..3b0e30c076 100644
--- a/dev/IconSource/IconSource.idl
+++ b/dev/IconSource/IconSource.idl
@@ -1,4 +1,4 @@
-namespace MU_XC_NAMESPACE
+namespace MU_XC_NAMESPACE
 {
 
 [WUXC_VERSION_RS3]
@@ -40,7 +40,7 @@ unsealed runtimeclass FontIconSource : IconSource
     String Glyph { get; set; };
     [MUX_DEFAULT_VALUE("20.0")]
     Double FontSize { get; set; };
-    [MUX_DEFAULT_VALUE("{ c_fontIconSourceDefaultFontFamily }")]
+    [MUX_DEFAULT_VALUE("winrt::FontFamily{ c_fontIconSourceDefaultFontFamily }")]
     Windows.UI.Xaml.Media.FontFamily FontFamily { get; set; };
     [MUX_DEFAULT_VALUE("{ 400 }")]
     Windows.UI.Text.FontWeight FontWeight { get; set; };
@@ -90,4 +90,4 @@ unsealed runtimeclass PathIconSource : IconSource
     static Windows.UI.Xaml.DependencyProperty DataProperty { get; };
 }
 
-}
\ No newline at end of file
+}
diff --git a/dev/PullToRefresh/RefreshContainer/RefreshContainer.cpp b/dev/PullToRefresh/RefreshContainer/RefreshContainer.cpp
index 02d8e9356e..b02c999d34 100644
--- a/dev/PullToRefresh/RefreshContainer/RefreshContainer.cpp
+++ b/dev/PullToRefresh/RefreshContainer/RefreshContainer.cpp
@@ -333,7 +333,7 @@ void RefreshContainer::RaiseRefreshRequested()
     PTR_TRACE_INFO(nullptr, TRACE_MSG_METH, METH_NAME, this);
     com_ptr<RefreshContainer> strongThis = get_strong();
 
-    winrt::DeferralCompletedHandler instance{ [strongThis]()
+    winrt::Deferral instance{ [strongThis]()
         {
             strongThis->CheckThread();
             strongThis->RefreshCompleted();
diff --git a/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizer.cpp b/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizer.cpp
index 2d5038579c..1e5da46dda 100644
--- a/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizer.cpp
+++ b/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizer.cpp
@@ -503,7 +503,7 @@ void RefreshVisualizer::RaiseRefreshRequested()
     PTR_TRACE_INFO(nullptr, TRACE_MSG_METH, METH_NAME, this);
     com_ptr<RefreshVisualizer> strongThis = get_strong();
 
-    winrt::DeferralCompletedHandler instance{ [strongThis]()
+    winrt::Deferral instance{ [strongThis]()
         {
             strongThis->CheckThread();
             strongThis->RefreshCompleted();
diff --git a/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizerEventArgs.cpp b/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizerEventArgs.cpp
index 45fae00e91..e7ce8080f6 100644
--- a/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizerEventArgs.cpp
+++ b/dev/PullToRefresh/RefreshVisualizer/RefreshVisualizerEventArgs.cpp
@@ -44,7 +44,7 @@ winrt::Deferral RefreshRequestedEventArgs::GetDeferral()
 
     com_ptr<RefreshRequestedEventArgs> strongThis = get_strong();
 
-    winrt::DeferralCompletedHandler instance{ [strongThis]()
+    winrt::Deferral instance{ [strongThis]()
         {
             strongThis->CheckThread();
             strongThis->DecrementDeferralCount();
diff --git a/dev/TeachingTip/TeachingTip.cpp b/dev/TeachingTip/TeachingTip.cpp
index dbab2e7aa6..54c32371b1 100644
--- a/dev/TeachingTip/TeachingTip.cpp
+++ b/dev/TeachingTip/TeachingTip.cpp
@@ -1235,7 +1235,7 @@ void TeachingTip::RaiseClosingEvent(bool attachDeferralCompletedHandler)
 
     if (attachDeferralCompletedHandler)
     {
-        winrt::DeferralCompletedHandler instance{ [strongThis = get_strong(), args]()
+        winrt::Deferral instance{ [strongThis = get_strong(), args]()
             {
                 strongThis->CheckThread();
                 if (!args->Cancel())
diff --git a/dev/TeachingTip/TeachingTipClosingEventArgs.cpp b/dev/TeachingTip/TeachingTipClosingEventArgs.cpp
index e252f609c5..d987de2c07 100644
--- a/dev/TeachingTip/TeachingTipClosingEventArgs.cpp
+++ b/dev/TeachingTip/TeachingTipClosingEventArgs.cpp
@@ -28,7 +28,7 @@ winrt::Deferral TeachingTipClosingEventArgs::GetDeferral()
 
     com_ptr<TeachingTipClosingEventArgs> strongThis = get_strong();
 
-    winrt::DeferralCompletedHandler instance{ [strongThis]()
+    winrt::Deferral instance{ [strongThis]()
     {
         strongThis->CheckThread();
         strongThis->DecrementDeferralCount();
diff --git a/dev/dll/Microsoft.UI.Xaml.vcxproj b/dev/dll/Microsoft.UI.Xaml.vcxproj
index d840bc2bdf..d4a427b8e1 100644
--- a/dev/dll/Microsoft.UI.Xaml.vcxproj
+++ b/dev/dll/Microsoft.UI.Xaml.vcxproj
@@ -2,7 +2,7 @@
 <!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
 <Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildProjectDirectory)\..\..\FeatureAreas.props" />
-  <Import Project="..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.props')" />
+  <Import Project="..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.props')" />
   <Import Project="..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.props" Condition="Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.props')" />
   <Import Project="..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.props" Condition="Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.props')" />
   <Import Project="..\..\packages\Microsoft.Build.Tasks.Git.1.0.0-beta2-18618-05\build\Microsoft.Build.Tasks.Git.props" Condition="Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0-beta2-18618-05\build\Microsoft.Build.Tasks.Git.props')" />
@@ -432,7 +432,7 @@
     <Import Project="..\..\packages\Microsoft.Build.Tasks.Git.1.0.0-beta2-18618-05\build\Microsoft.Build.Tasks.Git.targets" Condition="Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0-beta2-18618-05\build\Microsoft.Build.Tasks.Git.targets')" />
     <Import Project="..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.targets" Condition="Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.targets')" />
     <Import Project="..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.targets" Condition="Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.targets')" />
-    <Import Project="..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.targets')" />
+    <Import Project="..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.targets')" />
     <Import Project="..\..\packages\MUXPGODatabase.0.0.2\build\MUXPGODatabase.targets" Condition="Exists('..\..\packages\MUXPGODatabase.0.0.2\build\MUXPGODatabase.targets')" />
   </ImportGroup>
   <PropertyGroup>
@@ -624,8 +624,8 @@
   <Target Name="MakeSDKMetadata" AfterTargets="CppWinRTMergeProjectWinMDInputs" BeforeTargets="XamlMetadataCodeGenMUX" Inputs="$(OutDir)Unmerged\Microsoft.UI.Xaml.winmd" Outputs="$(OutDir)sdk\Microsoft.UI.xaml.winmd">
     <PropertyGroup>
       <MdMergeExe>"$(WindowsSdkDir)bin\$(WindowsTargetPlatformVersion)\$(PreferredToolArchitecture)\mdmerge.exe"</MdMergeExe>
-      <_MdMergeParameters>-v @(_MdMergeRefsDistinct->'-metadata_dir "%(RelativeDir)."', ' ')</_MdMergeParameters>
-      <_MdMergeParameters>$(_MdMergeParameters) -o "$(OutDir)\sdk" -i "$(CppWinRTUnmergedDir)" -partial -n:3 -createPublicMetadata -transformExperimental:transform</_MdMergeParameters>
+      <_MdMergeParameters>-v @(CppWinRTMdMergeMetadataDirectories->'-metadata_dir &quot;%(RelativeDir).&quot;', ' ')</_MdMergeParameters>
+      <_MdMergeParameters>$(_MdMergeParameters) -o "$(OutDir)\sdk" @(CppWinRTMdMergeInputs->'-i &quot;%(Identity)&quot;', ' ') -partial -n:3 -createPublicMetadata -transformExperimental:transform</_MdMergeParameters>
     </PropertyGroup>
     <Exec Command="$(MdMergeExe) $(_MdMergeParameters)" />
   </Target>
@@ -661,8 +661,8 @@
     <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.Common.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.Common.targets'))" />
     <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.props'))" />
     <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.GitHub.1.0.0-beta2-18618-05\build\Microsoft.SourceLink.GitHub.targets'))" />
-    <Error Condition="!Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.props'))" />
-    <Error Condition="!Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Windows.CppWinRT.2.0.190722.3\build\native\Microsoft.Windows.CppWinRT.targets'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.props'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Windows.CppWinRT.2.0.191202.6\build\native\Microsoft.Windows.CppWinRT.targets'))" />
   </Target>
   <Target Name="RunBinSkim" AfterTargets="AfterBuild" Condition="'$(Configuration)'=='Release'">
     <PropertyGroup>
diff --git a/dev/dll/packages.config b/dev/dll/packages.config
index 07dab78ada..2955dcca87 100644
--- a/dev/dll/packages.config
+++ b/dev/dll/packages.config
@@ -5,7 +5,7 @@
   <package id="Microsoft.Gsl" version="0.1.2.1" targetFramework="native" />
   <package id="Microsoft.SourceLink.Common" version="1.0.0-beta2-18618-05" targetFramework="native" developmentDependency="true" />
   <package id="Microsoft.SourceLink.GitHub" version="1.0.0-beta2-18618-05" targetFramework="native" developmentDependency="true" />
-  <package id="Microsoft.Windows.CppWinRT" version="2.0.190722.3" targetFramework="native" />
+  <package id="Microsoft.Windows.CppWinRT" version="2.0.191202.6" targetFramework="native" />
   <package id="MUXCustomBuildTasks" version="1.0.47" targetFramework="native" />
   <package id="MUXPGODatabase" version="0.0.2" targetFramework="native" />
 </packages>
\ No newline at end of file