diff --git a/.codeql.yml b/.codeql.yml
index 402e1fe9b..aac075630 100644
--- a/.codeql.yml
+++ b/.codeql.yml
@@ -43,7 +43,7 @@ jobs:
   displayName: CodeQL
   pool:
     name: NetCore1ESPool-Internal
-    demands: ImageOverride -equals windows.vs2017.amd64
+    demands: ImageOverride -equals windows.vs2019.amd64
   timeoutInMinutes: 90
 
   steps:
diff --git a/Directory.Build.props b/Directory.Build.props
index 407f4248f..41d0defa2 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -3,6 +3,11 @@
 
   <PropertyGroup>
     <!-- Require VS2017 so VS builds also use MSBuild v15.0. -->
-    <MinimumVisualStudioVersion>15.0</MinimumVisualStudioVersion>
+    <MinimumVisualStudioVersion>16.0</MinimumVisualStudioVersion>
+    <!--
+      Suppress "MSBUILD : warning : Post-build Code Analysis (FxCopCmd.exe) has been deprecated in favor of FxCop
+      analyzers, which run during build. Refer to https://aka.ms/fxcopanalyzers to migrate to FxCop analyzers."
+    -->
+    <SuppressLegacyCodeAnalysisDeprecatedWarning>true</SuppressLegacyCodeAnalysisDeprecatedWarning>
   </PropertyGroup>
 </Project>
diff --git a/Runtime.msbuild b/Runtime.msbuild
index dbe4db084..5862d38b4 100644
--- a/Runtime.msbuild
+++ b/Runtime.msbuild
@@ -11,6 +11,7 @@
     <BuildPortable Condition=" '$(BuildPortable)' == '' ">true</BuildPortable>
     <BuildInParallel Condition=" '$(BuildInParallel)' == '' And $(MSBuildNodeCount) &gt; 1 ">true</BuildInParallel>
     <BuildInParallel Condition=" '$(BuildInParallel)' == '' ">false</BuildInParallel>
+    <RestoreInParallel Condition=" '$(RestoreInParallel)' == '' ">false</RestoreInParallel>
     <TestInParallel Condition=" '$(TestInParallel)' == '' ">false</TestInParallel>
     <TestResultsDirectory>$(MSBuildThisFileDirectory)bin\$(Configuration)\test\TestResults\</TestResultsDirectory>
     <SkipStrongNamesExe>$(MSBuildThisFileDirectory)packages\Microsoft.Web.SkipStrongNames.1.0.0\tools\SkipStrongNames.exe</SkipStrongNamesExe>
@@ -64,24 +65,12 @@
   </Target>
 
   <Target Name="RestorePackages" DependsOnTargets="DownloadNuGet">
-    <ItemGroup>
-      <_NuGetPackagesAndSolutions Include="Runtime.sln" />
-
-      <!-- Avoid restoring RuntimePortable.sln directly. -->
-      <_NuGetPackagesAndSolutions Include="src\System.Net.Http.Formatting.NetCore\packages.config;
-          test\System.Net.Http.Formatting.NetCore.Test\packages.config"
-        Condition=" '$(BuildPortable)' == 'true' " />
-      <_ProjectsToRestore Include="test\System.Net.Http.Formatting.NetStandard.Test\System.Net.Http.Formatting.NetStandard.Test.csproj"
-        Condition=" '$(BuildPortable)' == 'true' " />
-    </ItemGroup>
-
-    <Message Text="Restoring NuGet packages..." Importance="High" />
-    <Exec Command='"$(NuGetExe)" restore "%(_NuGetPackagesAndSolutions.Identity)" ^
-        -PackagesDirectory packages -NonInteractive -Verbosity quiet' />
-    <MSBuild Projects="@(_ProjectsToRestore)" Targets="Restore"
-      BuildInParallel="$(BuildInParallel)"
-      Condition=" '$(BuildPortable)' == 'true' "
-      Properties="Configuration=$(Configuration);CodeAnalysis=$(CodeAnalysis);StyleCopEnabled=$(StyleCopEnabled);VisualStudioVersion=$(VisualStudioVersion)" />
+    <Message Text="%0ARestoring NuGet packages..." Importance="High" />
+    <MSBuild Projects="@(SolutionsToBuild)" Targets="Restore"
+      BuildInParallel="$(RestoreInParallel)"
+      Properties="Configuration=$(Configuration);CodeAnalysis=$(CodeAnalysis);StyleCopEnabled=$(StyleCopEnabled);
+                  RestorePackagesConfig=true;VisualStudioVersion=$(VisualStudioVersion)" />
+    <Message Importance="High" Text="" />
   </Target>
 
   <!-- Pick the right Microsoft.Web.FxCop package to use and copy it to a standard location. -->
@@ -96,7 +85,7 @@
         Properties="Configuration=Release;OutputPath=$(CustomFxCopRulesPath)" />
   </Target>
 
-  <Target Name="Build" DependsOnTargets="RestorePackages;BuildTools">
+  <Target Name="Build" DependsOnTargets="RestoreSkipStrongNames;RestorePackages;BuildTools">
     <!-- we need to batch the solution files since they both build Microsoft.TestCommon -->
     <Error Condition=" '$(CodeAnalysis)' == 'true' and '$(Configuration)' == 'Release' " Text="Unable to run code analysis in Release configuration. Release assemblies do not include SuppressMessage attributes (so code analysis would always fail with the errors that are normally suppressed)." />
     <MakeDir Directories="bin\$(Configuration)" />
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index a4050925e..f63cbb9fb 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -27,10 +27,10 @@ jobs:
   pool:
     ${{ if eq(variables['System.TeamProject'], 'public') }}:
       name: NetCore-Public
-      demands: ImageOverride -equals windows.vs2017.amd64.open
+      demands: ImageOverride -equals windows.vs2019.amd64.open
     ${{ else }}:
       name: NetCore1ESPool-Internal
-      demands: ImageOverride -equals windows.vs2017.amd64
+      demands: ImageOverride -equals windows.vs2019.amd64
   timeoutInMinutes: 30
 
   strategy:
diff --git a/build.cmd b/build.cmd
index a37e007d6..1cc1cd4ea 100644
--- a/build.cmd
+++ b/build.cmd
@@ -7,12 +7,11 @@ mkdir bin
 
 :Build
 
-REM Find the most recent 32bit MSBuild.exe on the system. Require v15.0 (installed with VS2017) or later since .NET
-REM Core projects are coming soon.
-REM Use `vswhere` for the search since %ProgramFiles(x86)%\msbuild\15.0\Bin\MSBuild.exe almost never exists.
+REM Find the most recent 32bit MSBuild.exe on the system. Require v16.0 (installed with VS2019) or later.
+REM Use `vswhere` for the search because it can find all VS installations.
 set vswhere="%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe"
 if not exist %vswhere% (
-  set VsWhere="%ProgramFiles%\Microsoft Visual Studio\Installer\vswhere.exe"
+  set vswhere="%ProgramFiles%\Microsoft Visual Studio\Installer\vswhere.exe"
 )
 if not exist %vswhere% (
   REM vswhere.exe not in normal locations; check the Path.
@@ -25,19 +24,29 @@ if not exist %vswhere% (
   goto BuildFail
 )
 
+REM We're fine w/ any .NET SDK newer than 2.1.500 but also need a 2.1.x runtime. Microsoft.Net.Core.Component.SDK.2.1
+REM actually checks for only the runtime these days.
 set InstallDir=
-for /f "usebackq tokens=*" %%i in (`%vswhere% -version ^[15^,16^) -latest -prerelease -products * ^
-    -requires Microsoft.Component.MSBuild -requires Microsoft.Net.Core.Component.SDK.2.1 ^
+for /f "usebackq tokens=*" %%i in (`%vswhere% -version 16 -latest -prerelease -products * ^
+    -requires Microsoft.Component.MSBuild ^
+    -requires Microsoft.NetCore.Component.SDK ^
+    -requires Microsoft.Net.Core.Component.SDK.2.1 ^
     -property installationPath`) do (
-  set InstallDir=%%i
+  set InstallDir="%%i"
 )
-if exist "%InstallDir%\MSBuild\15.0\Bin\MSBuild.exe" (
-  set MSBuild="%InstallDir%\MSBuild\15.0\Bin\MSBuild.exe"
+
+if exist %InstallDir%\MSBuild\Current\Bin\MSBuild.exe (
+  set MSBuild=%InstallDir%\MSBuild\Current\Bin\MSBuild.exe
 ) else (
-  echo Could not find MSBuild.exe. Please install the VS2017 BuildTools component or a workload that includes it.
+  echo Could not find MSBuild.exe. Please install the VS2019 BuildTools component or a workload that includes it.
   goto BuildFail
 )
 
+REM Configure NuGet operations to work w/in this repo i.e. do not pollute system packages folder.
+REM Note this causes two copies of packages restored using packages.config to land in this folder e.g.
+REM StyleCpy.5.0.0/ and stylecop/5.0.0/.
+set "NUGET_PACKAGES=%CD%\packages"
+
 REM Are we running in a local dev environment (not on CI)?
 if DEFINED CI (set Desktop=false) else if DEFINED TEAMCITY_VERSION (set Desktop=false) else (set Desktop=true)
 
diff --git a/global.json b/global.json
index 9ddc9bf9c..7b2cb540d 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
     "version": "2.1.500",
-    "rollForward": "latestPatch"
+    "rollForward": "major"
   }
 }
diff --git a/src/Strict.ruleset b/src/Strict.ruleset
index 5a2a69ba9..a0c61fcb5 100644
--- a/src/Strict.ruleset
+++ b/src/Strict.ruleset
@@ -6,5 +6,7 @@
   <IncludeAll Action="Error" />
   <Rules AnalyzerId="Microsoft.Analyzers.ManagedCodeAnalysis" RuleNamespace="Microsoft.Rules.Managed">
     <Rule Id="CA1062" Action="None" />
+    <!-- Ignore int.ToString(...) calls w/o an IFormatProvider in old code. -->
+    <Rule Id="CA1305" Action="None" />
   </Rules>
 </RuleSet>
\ No newline at end of file
diff --git a/src/System.Net.Http.Formatting.NetCore/System.Net.Http.Formatting.NetCore.csproj b/src/System.Net.Http.Formatting.NetCore/System.Net.Http.Formatting.NetCore.csproj
index e579c5926..6964b5560 100644
--- a/src/System.Net.Http.Formatting.NetCore/System.Net.Http.Formatting.NetCore.csproj
+++ b/src/System.Net.Http.Formatting.NetCore/System.Net.Http.Formatting.NetCore.csproj
@@ -266,13 +266,14 @@
       <HintPath>..\..\packages\Microsoft.Net.Http.2.2.13\lib\portable-net40+sl4+win8+wp71\System.Net.Http.Primitives.dll</HintPath>
     </Reference>
   </ItemGroup>
-  <!-- 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">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
-  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets" />
+  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets"
+      Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets')"
+        Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets'))" />
+  </Target>
 </Project>
\ No newline at end of file
diff --git a/test/Directory.Build.targets b/test/Directory.Build.targets
index 72087f737..54ff85834 100644
--- a/test/Directory.Build.targets
+++ b/test/Directory.Build.targets
@@ -1,6 +1,6 @@
 <Project>
   <Import Project="..\Directory.Build.targets" />
-  <Import Project="..\packages\**\xunit.runner.msbuild.props" />
+  <Import Project="..\packages\xunit.runner.msbuild.2.3.1\**\xunit.runner.msbuild.props" />
 
   <Target Name="Test" DependsOnTargets="_TestWithVSTest;_TestWithDotnetTest;_TestWithRunner" />
 
diff --git a/test/System.Net.Http.Formatting.NetCore.Test/System.Net.Http.Formatting.NetCore.Test.csproj b/test/System.Net.Http.Formatting.NetCore.Test/System.Net.Http.Formatting.NetCore.Test.csproj
index 8d7515803..7aecee20d 100644
--- a/test/System.Net.Http.Formatting.NetCore.Test/System.Net.Http.Formatting.NetCore.Test.csproj
+++ b/test/System.Net.Http.Formatting.NetCore.Test/System.Net.Http.Formatting.NetCore.Test.csproj
@@ -317,14 +317,21 @@
     <Analyzer Include="..\..\packages\xunit.analyzers.0.7.0\analyzers\dotnet\cs\xunit.analyzers.dll" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets" />
+  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets"
+      Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets')" />
+  <Import Project="..\..\packages\xunit.core.2.3.0\build\xunit.core.targets"
+      Condition="Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.props'))" />
-    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.targets'))" />
-    <Error Condition="!Exists('..\..\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets')"
+        Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Bcl.Build.1.0.8\tools\Microsoft.Bcl.Build.targets'))" />
+    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.props')"
+        Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.props'))" />
+    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')"
+        Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.targets'))" />
+    <Error Condition="!Exists('..\..\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props')"
+        Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props'))" />
   </Target>
-  <Import Project="..\..\packages\xunit.core.2.3.0\build\xunit.core.targets" Condition="Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')" />
 </Project>
\ No newline at end of file
diff --git a/tools/WebStack.StyleCop.targets b/tools/WebStack.StyleCop.targets
index 0b73b551f..5ff6c528a 100644
--- a/tools/WebStack.StyleCop.targets
+++ b/tools/WebStack.StyleCop.targets
@@ -1,7 +1,7 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <StyleCopMsBuildRunner Include="$(WebStackRootPath)packages\**\StyleCop.dll"/>
-    <StyleCopAdditionalAddins Include="$(WebStackRootPath)packages\**\Microsoft.Web.StyleCop.dll" />
+    <StyleCopMsBuildRunner Include="$(WebStackRootPath)packages\StyleCop.5.0.0\**\StyleCop.dll"/>
+    <StyleCopAdditionalAddins Include="$(WebStackRootPath)packages\Microsoft.Web.SkipStrongNames.1.0.0\**\Microsoft.Web.StyleCop.dll" />
     <StyleCopAdditionalAddinPaths Include="@(StyleCopAdditionalAddins -> '%(RootDir)%(Directory)')" />
   </ItemGroup>
 
diff --git a/tools/src/Microsoft.Web.FxCop/Microsoft.Web.FxCop.csproj b/tools/src/Microsoft.Web.FxCop/Microsoft.Web.FxCop.csproj
index d4a4451c7..2fc7c9bb4 100644
--- a/tools/src/Microsoft.Web.FxCop/Microsoft.Web.FxCop.csproj
+++ b/tools/src/Microsoft.Web.FxCop/Microsoft.Web.FxCop.csproj
@@ -10,7 +10,8 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Microsoft.Web.FxCop</RootNamespace>
     <AssemblyName>Microsoft.Web.FxCop</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <!-- May need to be updated as FxCopSdk.dll is migrated to newer TFMs. -->
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
     <OutputPath Condition=" '$(OutputPath)' == '' ">bin\$(Configuration)</OutputPath>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">