diff --git a/build.cake b/build.cake
index 412337aa43..0623dfff6b 100644
--- a/build.cake
+++ b/build.cake
@@ -336,6 +336,40 @@ Task("CreateMSBuildFolder")
         CopyDotNetHostResolver(env, "linux", "x64", "libhostfxr.so", sdkResolverTargetFolder, copyToArchSpecificFolder: false);
     }
 
+    // Copy content of NuGet.Build.Tasks
+    var nugetBuildTasksFolder = CombinePaths(env.Folders.Tools, "NuGet.Build.Tasks");
+    var nugetBuildTasksBinariesFolder = CombinePaths(nugetBuildTasksFolder, "lib", "net46");
+    var nugetBuildTasksTargetsFolder = CombinePaths(nugetBuildTasksFolder, "runtimes", "any", "native");
+
+    FileHelper.Copy(
+        source: CombinePaths(nugetBuildTasksBinariesFolder, "NuGet.Build.Tasks.dll"),
+        destination: CombinePaths(msbuild15BinTargetFolder, "NuGet.Build.Tasks.dll"));
+
+    FileHelper.Copy(
+        source: CombinePaths(nugetBuildTasksTargetsFolder, "NuGet.targets"),
+        destination: CombinePaths(msbuild15BinTargetFolder, "NuGet.targets"));
+
+    // Copy dependencies of NuGet.Build.Tasks
+    var nugetPackages = new []
+    {
+        "NuGet.Commands",
+        "NuGet.Common",
+        "NuGet.Configuration",
+        "NuGet.Frameworks",
+        "NuGet.ProjectModel",
+        "NuGet.Protocol",
+        "NuGet.Versioning"
+    };
+
+    foreach (var nugetPackage in nugetPackages)
+    {
+        var binaryName = nugetPackage + ".dll";
+        
+        FileHelper.Copy(
+            source: CombinePaths(env.Folders.Tools, nugetPackage, "lib", "net46", binaryName),
+            destination: CombinePaths(msbuild15BinTargetFolder, binaryName));
+    }
+
     // Copy content of Microsoft.Net.Compilers
     Information("Copying Microsoft.Net.Compilers...");
     var compilersSourceFolder = CombinePaths(env.Folders.Tools, "Microsoft.Net.Compilers", "tools");
@@ -632,8 +666,11 @@ Task("Test")
             else
             {
                 // Copy the Mono-built Microsoft.Build.* binaries to the test folder.
+                // This is necessary to work around a Mono bug that is exasperated by xUnit.
                 DirectoryHelper.Copy($"{env.Folders.MonoMSBuildLib}", instanceFolder);
 
+                DeleteUnnecessaryAssemblies(instanceFolder);
+
                 var runScript = CombinePaths(env.Folders.Mono, "run");
 
                 // By default, the run script launches OmniSharp. To launch our Mono runtime
@@ -649,6 +686,25 @@ Task("Test")
     }
 });
 
+/// <summary>
+/// Delete assemblies that are included in our Mono package.
+/// </summary>
+void DeleteUnnecessaryAssemblies(string folder)
+{
+    FileHelper.Delete(CombinePaths(folder, "System.AppContext.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Numerics.Vectors.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Runtime.InteropServices.RuntimeInformation.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.ComponentModel.Primitives.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.ComponentModel.TypeConverter.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Console.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.IO.FileSystem.Primitives.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.IO.FileSystem.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Security.Cryptography.Encoding.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Security.Cryptography.Primitives.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Security.Cryptography.X509Certificates.dll"));
+    FileHelper.Delete(CombinePaths(folder, "System.Threading.Thread.dll"));
+}
+
 void CopyMonoBuild(BuildEnvironment env, string sourceFolder, string outputFolder)
 {
     DirectoryHelper.Copy(sourceFolder, outputFolder, copySubDirectories: false);
@@ -657,18 +713,7 @@ void CopyMonoBuild(BuildEnvironment env, string sourceFolder, string outputFolde
     DirectoryHelper.Copy($"{env.Folders.MSBuild}", CombinePaths(outputFolder, "msbuild"));
 
     // Included in Mono
-    FileHelper.Delete(CombinePaths(outputFolder, "System.AppContext.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Numerics.Vectors.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Runtime.InteropServices.RuntimeInformation.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.ComponentModel.Primitives.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.ComponentModel.TypeConverter.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Console.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.IO.FileSystem.Primitives.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.IO.FileSystem.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Security.Cryptography.Encoding.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Security.Cryptography.Primitives.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Security.Cryptography.X509Certificates.dll"));
-    FileHelper.Delete(CombinePaths(outputFolder, "System.Threading.Thread.dll"));
+    DeleteUnnecessaryAssemblies(outputFolder);
 }
 
 string PublishMonoBuild(string project, BuildEnvironment env, BuildPlan plan, string configuration)
diff --git a/build.json b/build.json
index 6c46a1920c..d5ec7b24df 100644
--- a/build.json
+++ b/build.json
@@ -12,8 +12,8 @@
   "MonoRuntimeLinux32": "mono.linux-x86-5.10.1.20.zip",
   "MonoRuntimeLinux64": "mono.linux-x86_64-5.10.1.20.zip",
   "MonoFramework": "framework-5.10.1.20.zip",
-  "MonoMSBuildRuntime": "Microsoft.Build.Runtime.Mono-alpha6.zip",
-  "MonoMSBuildLib": "Microsoft.Build.Lib.Mono-alpha6.zip",
+  "MonoMSBuildRuntime": "Microsoft.Build.Runtime.Mono-mono-5.10.1.20.zip",
+  "MonoMSBuildLib": "Microsoft.Build.Lib.Mono-mono-5.10.1.20.zip",
   "HostProjects": [
     "OmniSharp.Stdio",
     "OmniSharp.Http"
diff --git a/build/Packages.props b/build/Packages.props
index 31dfa036e8..d0376c7830 100644
--- a/build/Packages.props
+++ b/build/Packages.props
@@ -9,10 +9,10 @@
     <MicrosoftAspNetCoreHostingVersion>1.1.0</MicrosoftAspNetCoreHostingVersion>
     <MicrosoftAspNetCoreHttpFeaturesVersion>1.1.0</MicrosoftAspNetCoreHttpFeaturesVersion>
     <MicrosoftAspNetCoreServerKestrelVersion>1.1.0</MicrosoftAspNetCoreServerKestrelVersion>
-    <MicrosoftBuildVersion>15.3.409</MicrosoftBuildVersion>
-    <MicrosoftBuildFrameworkVersion>15.3.409</MicrosoftBuildFrameworkVersion>
-    <MicrosoftBuildTasksCoreVersion>15.3.409</MicrosoftBuildTasksCoreVersion>
-    <MicrosoftBuildUtilitiesCoreVersion>15.3.409</MicrosoftBuildUtilitiesCoreVersion>
+    <MicrosoftBuildVersion>15.6.82</MicrosoftBuildVersion>
+    <MicrosoftBuildFrameworkVersion>15.6.82</MicrosoftBuildFrameworkVersion>
+    <MicrosoftBuildTasksCoreVersion>15.6.82</MicrosoftBuildTasksCoreVersion>
+    <MicrosoftBuildUtilitiesCoreVersion>15.6.82</MicrosoftBuildUtilitiesCoreVersion>
     <MicrosoftCodeAnalysisCommonVersion>2.7.0</MicrosoftCodeAnalysisCommonVersion>
     <MicrosoftCodeAnalysisCSharpVersion>2.7.0</MicrosoftCodeAnalysisCSharpVersion>
     <MicrosoftCodeAnalysisCSharpFeaturesVersion>2.7.0</MicrosoftCodeAnalysisCSharpFeaturesVersion>
diff --git a/tools/packages.config b/tools/packages.config
index 2333d9e0d5..4f4744db46 100644
--- a/tools/packages.config
+++ b/tools/packages.config
@@ -1,13 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
     <package id="Cake" version="0.23" />
-    <package id="Microsoft.Build" version="15.3.409" />
-    <package id="Microsoft.Build.Framework" version="15.3.409" />
-    <package id="Microsoft.Build.Runtime" version="15.3.409" />
-    <package id="Microsoft.Build.Tasks.Core" version="15.3.409" />
-    <package id="Microsoft.Build.Utilities.Core" version="15.3.409" />
-    <package id="Microsoft.Net.Compilers" version="2.3.2" />
+    <package id="Microsoft.Build" version="15.6.82" />
+    <package id="Microsoft.Build.Framework" version="15.6.82" />
+    <package id="Microsoft.Build.Runtime" version="15.6.82" />
+    <package id="Microsoft.Build.Tasks.Core" version="15.6.82" />
+    <package id="Microsoft.Build.Utilities.Core" version="15.6.82" />
+    <package id="Microsoft.Net.Compilers" version="2.7.0" />
     <package id="Microsoft.DotNet.MSBuildSdkResolver" version="2.1.300-preview2-008523" />
+    <package id="NuGet.Build.Tasks" version="4.6.1" />
+    <package id="NuGet.Commands" version="4.6.1" />
+    <package id="NuGet.Common" version="4.6.1" />
+    <package id="NuGet.Configuration" version="4.6.1" />
+    <package id="NuGet.Frameworks" version="4.6.1" />
+    <package id="NuGet.ProjectModel" version="4.6.1" />
+    <package id="NuGet.Protocol" version="4.6.1" />
+    <package id="NuGet.Versioning" version="4.6.1" />
     <package id="runtime.linux-x64.Microsoft.NETCore.DotNetHostResolver" version="2.1.0-preview3-26404-02" />
     <package id="runtime.osx-x64.Microsoft.NETCore.DotNetHostResolver" version="2.1.0-preview3-26404-02" />
     <package id="runtime.win-x64.Microsoft.NETCore.DotNetHostResolver" version="2.1.0-preview3-26404-02" />