diff --git a/build/dependencies.props b/build/dependencies.props
index 90b1d52834..2d5779f750 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -101,6 +101,7 @@
     <MicrosoftNETCoreApp21PackageVersion>2.1.3</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETCoreDotNetAppHost21PackageVersion>$(MicrosoftNETCoreApp21PackageVersion)</MicrosoftNETCoreDotNetAppHost21PackageVersion>
     <MicrosoftNETCoreWindowsApiSetsPackageVersion>1.0.1</MicrosoftNETCoreWindowsApiSetsPackageVersion>
+    <MicrosoftNETFrameworkReferenceAssembliesPackageVersion>1.0.0-alpha-004</MicrosoftNETFrameworkReferenceAssembliesPackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.6.1</MicrosoftNETTestSdkPackageVersion>
     <MicrosoftOwinSecurityCookiesPackageVersion>3.0.1</MicrosoftOwinSecurityCookiesPackageVersion>
     <MicrosoftOwinSecurityPackageVersion>3.0.1</MicrosoftOwinSecurityPackageVersion>
diff --git a/build/external-dependencies.props b/build/external-dependencies.props
index 2057afdc9a..0afff9cdfd 100644
--- a/build/external-dependencies.props
+++ b/build/external-dependencies.props
@@ -108,6 +108,7 @@
     <ExternalDependency Include="Microsoft.NETCore.DotNetAppHost" Version="$(MicrosoftNETCoreDotNetAppHostPackageVersion)" />
 
     <ExternalDependency Include="Microsoft.NETCore.Windows.ApiSets" Version="$(MicrosoftNETCoreWindowsApiSetsPackageVersion)" />
+    <ExternalDependency Include="Microsoft.NETFramework.ReferenceAssemblies" Version="$(MicrosoftNETFrameworkReferenceAssembliesPackageVersion)" />
     <ExternalDependency Include="Microsoft.Owin.Security" Version="$(MicrosoftOwinSecurityPackageVersion)" />
     <ExternalDependency Include="Microsoft.Owin.Security.Cookies" Version="$(MicrosoftOwinSecurityCookiesPackageVersion)" />
     <ExternalDependency Include="Microsoft.Owin.Testing" Version="$(MicrosoftOwinTestingPackageVersion)" />
diff --git a/build/sources.props b/build/sources.props
index a08e49dfdb..039b4f37fd 100644
--- a/build/sources.props
+++ b/build/sources.props
@@ -18,6 +18,7 @@
       https://dotnet.myget.org/F/aspnetcore-tools/api/v3/index.json;
       https://dotnet.myget.org/F/aspnetcore-master/api/v3/index.json;
       https://dotnet.myget.org/F/roslyn/api/v3/index.json;
+      https://dotnet.myget.org/F/roslyn-tools/api/v3/index.json;
       https://vside.myget.org/F/vssdk/api/v3/index.json;
       https://vside.myget.org/F/vsmac/api/v3/index.json
     </RestoreSources>