diff --git a/docs/contributing/Building, Debugging, and Testing on Windows.md b/docs/contributing/Building, Debugging, and Testing on Windows.md
index f6ea166e1959b679b76469b7cc89ea24a35c49ab..d83f7ab218862594afcae9a6a437f934f876adfd 100644
--- a/docs/contributing/Building, Debugging, and Testing on Windows.md	
+++ b/docs/contributing/Building, Debugging, and Testing on Windows.md	
@@ -19,7 +19,7 @@ The minimal required version of .NET Framework is 4.7.2.
     - Ensure C#, VB, MSBuild, .NET Core and Visual Studio Extensibility are included in the selected work loads
     - Ensure Visual Studio is on Version "RC1" or greater
     - Ensure "Use Previews" is checked in Tools -> Options -> Projects and Solutions -> .NET Core
-1. [.NET Core SDK 3.0 Preview 4](https://dotnet.microsoft.com/download/dotnet-core/3.0) [Windows x64 installer](https://dotnetcli.azureedge.net/dotnet/Sdk/3.0.100-preview4-010963/dotnet-sdk-3.0.100-preview4-010963-win-x64.exe )
+1. [.NET Core SDK 3.0 Preview 6](https://dotnet.microsoft.com/download/dotnet-core/3.0) [Windows x64 installer](https://dotnetcli.azureedge.net/dotnet/Sdk/3.0.100-preview6-011773/dotnet-sdk-3.0.100-preview6-011773-win-x64.exe )
 1. [PowerShell 5.0 or newer](https://docs.microsoft.com/en-us/powershell/scripting/setup/installing-windows-powershell). If you are on Windows 10, you are fine; you'll only need to upgrade if you're on Windows 7. The download link is under the "upgrading existing Windows PowerShell" heading.
 1. Run Restore.cmd
 1. Open Roslyn.sln
diff --git a/eng/Versions.props b/eng/Versions.props
index 5e331bbb4079dd03154a48998453035ba20c8a58..b801f5ad358c96e5e27e70ea998fc89545f32730 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -67,9 +67,8 @@
     <MicrosoftMSXMLVersion>8.0.0.0-alpha</MicrosoftMSXMLVersion>
     <MicrosoftNetCompilersToolsetVersion>3.1.0-beta1-19164-01</MicrosoftNetCompilersToolsetVersion>
     <MicrosoftNetCoreAnalyzersVersion>$(RoslynDiagnosticsNugetPackageVersion)</MicrosoftNetCoreAnalyzersVersion>
-    <MicrosoftNetCoreILAsmVersion>3.0.0-preview4-27525-72</MicrosoftNetCoreILAsmVersion>
-    <MicrosoftNetCoreILAsmVersion>3.0.0-preview4-27525-72</MicrosoftNetCoreILAsmVersion>
-    <MicrosoftNetCoreILDasmVersion>3.0.0-preview4-27525-72</MicrosoftNetCoreILDasmVersion>
+    <MicrosoftNetCoreILAsmVersion>3.0.0-preview6-27706-71</MicrosoftNetCoreILAsmVersion>
+    <MicrosoftNetCoreILDasmVersion>3.0.0-preview6-27706-71</MicrosoftNetCoreILDasmVersion>
     <MicrosoftNETCorePlatformsVersion>2.1.2</MicrosoftNETCorePlatformsVersion>
     <MicrosoftNETTestSdkVersion>16.0.1</MicrosoftNETTestSdkVersion>
     <MicrosoftNETCoreTestHostVersion>1.1.0</MicrosoftNETCoreTestHostVersion>
diff --git a/global.json b/global.json
index f5793f91007c1f303d4bdd38e2726553309860f1..b8a97eed5921ff469daa6d0cbdaebd2f62e700b6 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "3.0.100-preview4-010963",
+    "dotnet": "3.0.100-preview6-011773",
     "vs": {
       "version": "16.0"
     },
diff --git a/src/Compilers/CSharp/Test/Symbol/Microsoft.CodeAnalysis.CSharp.Symbol.UnitTests.csproj b/src/Compilers/CSharp/Test/Symbol/Microsoft.CodeAnalysis.CSharp.Symbol.UnitTests.csproj
index 6eede0deeb46de6aa926a321b553bd5dda064c91..bc7d8b342bd6132bcfdf58c07662b4be4d9f1611 100644
--- a/src/Compilers/CSharp/Test/Symbol/Microsoft.CodeAnalysis.CSharp.Symbol.UnitTests.csproj
+++ b/src/Compilers/CSharp/Test/Symbol/Microsoft.CodeAnalysis.CSharp.Symbol.UnitTests.csproj
@@ -6,7 +6,6 @@
     <RootNamespace>Microsoft.CodeAnalysis.CSharp.Symbol.UnitTests</RootNamespace>
     <NoStdLib>true</NoStdLib>
     <TargetFrameworks>net472;netcoreapp3.0</TargetFrameworks>
-    <RuntimeIdentifiers>$(RoslynPortableRuntimeIdentifiers)</RuntimeIdentifiers>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <ItemGroup Label="Project References">
diff --git a/src/Tools/BuildBoss/CompilerNuGetCheckerUtil.cs b/src/Tools/BuildBoss/CompilerNuGetCheckerUtil.cs
index c77dd55ef1ac548f3d3946d88c912731c4578cdd..6bab8568882dfef8432523f51ccebdf82de36847 100644
--- a/src/Tools/BuildBoss/CompilerNuGetCheckerUtil.cs
+++ b/src/Tools/BuildBoss/CompilerNuGetCheckerUtil.cs
@@ -106,13 +106,6 @@ private bool CheckDesktop(TextWriter textWriter, IEnumerable<string> assetRelati
                         string.Empty,
                         assetRelativeNames);
 
-            // Temporarily inserting Microsoft.DiaSymReader.Native.arm.dll while SDK team tracks down why 
-            // it's being inserted into destkop builds.
-            // https://github.com/dotnet/cli/issues/10979
-            allGood &= VerifyVsix(
-                        textWriter,
-                        FindVsix("Roslyn.Compilers.Extension"),
-                        assetRelativeNames.Concat(new[] { "Roslyn.Compilers.Extension.dll", "Microsoft.DiaSymReader.Native.arm.dll" }));
             return allGood;
         }