diff --git a/BuildToolsVersion.txt b/BuildToolsVersion.txt
deleted file mode 100644
index bea8645271c..00000000000
--- a/BuildToolsVersion.txt
+++ /dev/null
@@ -1 +0,0 @@
-1.0.27-prerelease-01001-04
diff --git a/DotnetCLIToolsVersion.txt b/DotnetCLIToolsVersion.txt
index 8c63a20474c..38295b0d98d 100644
--- a/DotnetCLIToolsVersion.txt
+++ b/DotnetCLIToolsVersion.txt
@@ -1 +1 @@
-2.1.500
+2.1.504
\ No newline at end of file
diff --git a/FSharpBuild.Directory.Build.props b/FSharpBuild.Directory.Build.props
index f64b9fc88bc..ea6c6c217ea 100644
--- a/FSharpBuild.Directory.Build.props
+++ b/FSharpBuild.Directory.Build.props
@@ -89,7 +89,7 @@
   </PropertyGroup>
 
   <!-- SDK targets override -->
-  <PropertyGroup Condition="'$(Configuration)' != 'Proto' AND Exists('$(ProtoOutputPath)')">
+  <PropertyGroup Condition="'$(Configuration)' != 'Proto' AND '$(DisableCompilerRedirection)'!='true' AND Exists('$(ProtoOutputPath)')">
     <FSharpTargetsPath>$(ProtoOutputPath)\Microsoft.FSharp.Targets</FSharpTargetsPath>
     <FSharpPropsShim>$(ProtoOutputPath)\Microsoft.FSharp.NetSdk.props</FSharpPropsShim>
     <FSharpTargetsShim>$(ProtoOutputPath)\Microsoft.FSharp.NetSdk.targets</FSharpTargetsShim>
diff --git a/fcs/Directory.Build.props b/fcs/Directory.Build.props
index 6535dbd2aea..3478a48aa9a 100644
--- a/fcs/Directory.Build.props
+++ b/fcs/Directory.Build.props
@@ -9,17 +9,11 @@
     <ArtifactsObjDir>$(ArtifactsDir)\obj</ArtifactsObjDir>
     <OutputPath>$(ArtifactsBinDir)\fcs</OutputPath>
     <IntermediateOutputPath>$(ArtifactsObjDir)\fcs</IntermediateOutputPath>
+    <DisableCompilerRedirection>true</DisableCompilerRedirection>
   </PropertyGroup>
 
   <!-- SDK targets override -->
   <PropertyGroup>
     <ProtoOutputPath>$(ArtifactsBinDir)\FSharp.Build\Proto\net46</ProtoOutputPath>
   </PropertyGroup>
-
-  <PropertyGroup Condition="Exists('$(ProtoOutputPath)')">
-    <FSharpTargetsPath>$(ProtoOutputPath)\Microsoft.FSharp.Targets</FSharpTargetsPath>
-    <FSharpPropsShim>$(ProtoOutputPath)\Microsoft.FSharp.NetSdk.props</FSharpPropsShim>
-    <FSharpTargetsShim>$(ProtoOutputPath)\Microsoft.FSharp.NetSdk.targets</FSharpTargetsShim>
-    <FSharpOverridesTargetsShim>$(ProtoOutputPath)\Microsoft.FSharp.Overrides.NetSdk.targets</FSharpOverridesTargetsShim>
-  </PropertyGroup>
 </Project>
diff --git a/fcs/build.fsx b/fcs/build.fsx
index 7165eaf18d0..5a533714524 100644
--- a/fcs/build.fsx
+++ b/fcs/build.fsx
@@ -31,7 +31,7 @@ let dotnetExePath =
     if File.Exists(pathToCli) then
         pathToCli
     else
-        DotNetCli.InstallDotNetSDK "2.1.403"
+        DotNetCli.InstallDotNetSDK "2.1.504"
 
 let runDotnet workingDir args =
     let result =
@@ -97,8 +97,7 @@ Target "Build" (fun _ ->
 
 Target "Test" (fun _ ->
     // This project file is used for the netcoreapp2.0 tests to work out reference sets
-    runDotnet __SOURCE_DIRECTORY__ "restore ../tests/projects/Sample_NETCoreSDK_FSharp_Library_netstandard2_0/Sample_NETCoreSDK_FSharp_Library_netstandard2_0.fsproj -v n"
-    runDotnet __SOURCE_DIRECTORY__ "build ../tests/projects/Sample_NETCoreSDK_FSharp_Library_netstandard2_0/Sample_NETCoreSDK_FSharp_Library_netstandard2_0.fsproj -v n"
+    runDotnet __SOURCE_DIRECTORY__ "build ../tests/projects/Sample_NETCoreSDK_FSharp_Library_netstandard2_0/Sample_NETCoreSDK_FSharp_Library_netstandard2_0.fsproj -v n /restore /p:DisableCompilerRedirection=true"
 
     // Now run the tests
     runDotnet __SOURCE_DIRECTORY__ "test FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj --no-restore --no-build -v n -c release"