diff --git a/build.cmd b/build.cmd
index 277cee2fb0e..7ae0c12403e 100644
--- a/build.cmd
+++ b/build.cmd
@@ -938,6 +938,7 @@ set HOSTED_COMPILER=1
 
 if "%TEST_NET40_FSHARPQA_SUITE%" == "1" (
 
+    set CSC_PIPE=%~dp0packages\Microsoft.Net.Compilers.2.7.0\tools\csc.exe
     set FSC=!FSCBINPATH!\fsc.exe
     set FSCOREDLLPATH=!FSCBinPath!\FSharp.Core.dll
     set PATH=!FSCBINPATH!;!PATH!
diff --git a/tests/fsharp/packages.config b/tests/fsharp/packages.config
index 4715cb922cb..1d5c24f97f0 100644
--- a/tests/fsharp/packages.config
+++ b/tests/fsharp/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Net.Compilers" version="2.4.0" />
+  <package id="Microsoft.Net.Compilers" version="2.7.0" />
   <package id="NUnit3TestAdapter" version="3.7.0" targetFramework="net45" />
   <package id="runtime.win-x64.Microsoft.NETCore.ILDAsm" version="2.0.3" />
   <package id="runtime.win-x86.Microsoft.NETCore.ILDAsm" version="2.0.3" />
diff --git a/tests/fsharp/test-framework.fs b/tests/fsharp/test-framework.fs
index e356652dc2d..279a98f12b5 100644
--- a/tests/fsharp/test-framework.fs
+++ b/tests/fsharp/test-framework.fs
@@ -155,7 +155,7 @@ let config configurationName envVars =
     let fsi_flags = "-r:System.Core.dll --nowarn:20 --define:INTERACTIVE --maxerrors:1 --abortonerror"
     let Is64BitOperatingSystem = WindowsPlatform.Is64BitOperatingSystem envVars
     let architectureMoniker = if Is64BitOperatingSystem then "x64" else "x86"
-    let CSC = requireFile (packagesDir ++ "Microsoft.Net.Compilers.2.4.0" ++ "tools" ++ "csc.exe")
+    let CSC = requireFile (packagesDir ++ "Microsoft.Net.Compilers.2.7.0" ++ "tools" ++ "csc.exe")
     let ILDASM = requireFile (packagesDir ++ ("runtime.win-" + architectureMoniker + ".Microsoft.NETCore.ILDAsm.2.0.3") ++ "runtimes" ++ ("win-" + architectureMoniker) ++ "native" ++ "ildasm.exe")
     let coreclrdll = requireFile (packagesDir ++ ("runtime.win-" + architectureMoniker + ".Microsoft.NETCore.Runtime.CoreCLR.2.0.3") ++ "runtimes" ++ ("win-" + architectureMoniker) ++ "native" ++ "coreclr.dll")
     let PEVERIFY = requireFile (SCRIPT_ROOT ++ ".." ++ "fsharpqa" ++ "testenv" ++ "src" ++ "PEVerify" ++ "bin" ++ configurationName ++ "net46" ++ "PEVerify.exe")
diff --git a/tests/fsharpqa/Source/Import/AccessibilityTests.cs b/tests/fsharpqa/Source/Import/AccessibilityTests.cs
index e3df6a9fb70..1a8ac727bce 100644
--- a/tests/fsharpqa/Source/Import/AccessibilityTests.cs
+++ b/tests/fsharpqa/Source/Import/AccessibilityTests.cs
@@ -10,9 +10,7 @@ public class Accessibility
     private int Private { get; set; }
     protected int Protected { get; set; }
     internal int Internal { get; set; }
-    // Note: accessibility was modified using dnspy
-    public int FamOrAssembly { get; set; }
-    // Note: accessibility was modified using dnspy
-    public int FamAndAssembly { get; set; }
+    protected internal int FamOrAssembly { get; set; }
+    private protected int FamAndAssembly { get; set; }
 }
 
diff --git a/tests/fsharpqa/Source/Import/AccessibilityTests.dll b/tests/fsharpqa/Source/Import/AccessibilityTests.dll
deleted file mode 100644
index 0e01f245a7d..00000000000
Binary files a/tests/fsharpqa/Source/Import/AccessibilityTests.dll and /dev/null differ
diff --git a/tests/fsharpqa/Source/Import/env.lst b/tests/fsharpqa/Source/Import/env.lst
index 792c23a3ace..7e9100030a3 100644
--- a/tests/fsharpqa/Source/Import/env.lst
+++ b/tests/fsharpqa/Source/Import/env.lst
@@ -83,11 +83,11 @@ NOMONO	SOURCE=reference2.fsx SCFLAGS="--nologo -r:reference1.dll" PRECMD="\$FSC_
 ###
 ### F# can consume FamOrAssembly and FamAndAssembly in combination with IVT
 ###
-    SOURCE=FamAndAssembly.fs         SCFLAGS="-a -r:AccessibilityTests.dll"    # FamAndAssembly.fs
+    SOURCE=FamAndAssembly.fs         SCFLAGS="-a -r:AccessibilityTests.dll" PRECMD="\$CSC_PIPE /debug /target:library /langversion:latest AccessibilityTests.cs"    # FamAndAssembly.fs
     ### See issue https://github.com/Microsoft/visualfsharp/issues/2496
-    ### SOURCE=FamOrAssembly.fs      SCFLAGS="-a -r:AccessibilityTests.dll"    # FamOrAssembly.fs
-    SOURCE=FamAndAssembly_NoIVT.fs   SCFLAGS="-a -r:AccessibilityTests.dll"    # FamAndAssembly_NoIVT.fs
-    ### SOURCE=FamOrAssembly_NoIVT.fs    SCFLAGS="-a -r:AccessibilityTests.dll"    # FamOrAssembly_NoIVT.fs
+    ### SOURCE=FamOrAssembly.fs      SCFLAGS="-a -r:AccessibilityTests.dll" PRECMD="\$CSC_PIPE /debug /target:library /langversion:latest AccessibilityTests.cs"    # FamOrAssembly.fs
+    SOURCE=FamAndAssembly_NoIVT.fs   SCFLAGS="-a -r:AccessibilityTests.dll" PRECMD="\$CSC_PIPE /debug /target:library /langversion:latest AccessibilityTests.cs"    # FamAndAssembly_NoIVT.fs
+    ### SOURCE=FamOrAssembly_NoIVT.fs    SCFLAGS="-a -r:AccessibilityTests.dll" PRECMD="\$CSC_PIPE /debug /target:library /langversion:latest AccessibilityTests.cs"    # FamOrAssembly_NoIVT.fs
 
 ###
 ### Iterate over BCL collections
@@ -100,4 +100,4 @@ NOMONO	SOURCE=reference2.fsx SCFLAGS="--nologo -r:reference1.dll" PRECMD="\$FSC_
 
 
 	SOURCE=ReferenceExe01.fsx PRECMD="\$FSC_PIPE ReferenceExe.fs"								# ReferenceExe01.fsx
-	SOURCE=LineDirectiveFromCSharp.fs   PRECMD="\$CSC_PIPE /t:library LineDirectiveLib.cs" SCFLAGS="-r:LineDirectiveLib.dll"	# LineDirectiveFromCSharp.fs
\ No newline at end of file
+	SOURCE=LineDirectiveFromCSharp.fs   PRECMD="\$CSC_PIPE /t:library LineDirectiveLib.cs" SCFLAGS="-r:LineDirectiveLib.dll"	# LineDirectiveFromCSharp.fs