diff --git a/global.json b/global.json
index c15eb04d9531..db00fc486c8c 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "5.0.100-preview.1.20154.9",
+    "dotnet": "5.0.100-preview.4.20217.10",
     "runtimes": {
       "dotnet": [
         "$(MicrosoftNETCoreAppRuntimePackageVersion)"
diff --git a/test/EndToEnd/GivenSelfContainedAppsRollForward.cs b/test/EndToEnd/GivenSelfContainedAppsRollForward.cs
index f90f0b410502..297dfd1d56bf 100644
--- a/test/EndToEnd/GivenSelfContainedAppsRollForward.cs
+++ b/test/EndToEnd/GivenSelfContainedAppsRollForward.cs
@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Xml.Linq;
 using FluentAssertions;
 using Microsoft.DotNet.TestFramework;
@@ -20,7 +21,7 @@ internal void ItRollsForwardToTheLatestVersion(string packageName, string minorV
                 PackageName = packageName,
                 MinorVersion = minorVersion,
                 //  Set RuntimeIdentifier to opt in to roll-forward behavior
-                RuntimeIdentifier = Microsoft.DotNet.PlatformAbstractions.RuntimeEnvironment.GetRuntimeIdentifier()
+                RuntimeIdentifier = RuntimeInformation.RuntimeIdentifier
             };
 
             var testInstance = testProjectCreator.Create();
diff --git a/test/EndToEnd/ProjectBuildTests.cs b/test/EndToEnd/ProjectBuildTests.cs
index 8a88bbc085e8..b17b90b73289 100644
--- a/test/EndToEnd/ProjectBuildTests.cs
+++ b/test/EndToEnd/ProjectBuildTests.cs
@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Xml.Linq;
 using Microsoft.DotNet.PlatformAbstractions;
 using Microsoft.DotNet.TestFramework;
@@ -127,7 +128,7 @@ private void TestTemplateBuild(string templateName, bool selfContained = false)
                 .Execute(newArgs)
                 .Should().Pass();
 
-            var buildArgs = selfContained ? "" :$"-r {RuntimeEnvironment.GetRuntimeIdentifier()}";
+            var buildArgs = selfContained ? "" :$"-r {RuntimeInformation.RuntimeIdentifier}";
             var dotnetRoot = Path.GetDirectoryName(RepoDirectoriesProvider.DotnetUnderTest);
             new BuildCommand()
                  .WithEnvironmentVariable("PATH", dotnetRoot) // override PATH since razor rely on PATH to find dotnet
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyFactAttribute.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyFactAttribute.cs
index 78be9c8569f1..843d0668d87f 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyFactAttribute.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyFactAttribute.cs
@@ -1,7 +1,8 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using Microsoft.DotNet.PlatformAbstractions;
+
+using System.Runtime.InteropServices;
 using Xunit;
 
 namespace Microsoft.DotNet.Tools.Test.Utilities
@@ -10,7 +11,7 @@ public class UnixOnlyFactAttribute : FactAttribute
     {
         public UnixOnlyFactAttribute()
         {
-            if (RuntimeEnvironment.OperatingSystemPlatform == Platform.Windows)
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
                 this.Skip = "This test requires Unix to run";
             }
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyTheoryAttribute.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyTheoryAttribute.cs
index fe0557b88c8b..461ea7b36b6a 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyTheoryAttribute.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/UnixOnlyTheoryAttribute.cs
@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using Microsoft.DotNet.PlatformAbstractions;
+using System.Runtime.InteropServices;
 using Xunit;
 
 namespace Microsoft.DotNet.Tools.Test.Utilities
@@ -10,7 +10,7 @@ public class UnixOnlyTheoryAttribute : TheoryAttribute
     {
         public UnixOnlyTheoryAttribute()
         {
-            if (RuntimeEnvironment.OperatingSystemPlatform == Platform.Windows)
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
                 this.Skip = "This test requires Unix to run";
             }
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyFactAttribute.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyFactAttribute.cs
index 7f9abcccba91..079a1af90dd3 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyFactAttribute.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyFactAttribute.cs
@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using Microsoft.DotNet.PlatformAbstractions;
+using System.Runtime.InteropServices;
 using Xunit;
 
 namespace Microsoft.DotNet.Tools.Test.Utilities
@@ -10,7 +10,7 @@ public class WindowsOnlyFactAttribute : FactAttribute
     {
         public WindowsOnlyFactAttribute()
         {
-            if (RuntimeEnvironment.OperatingSystemPlatform != Platform.Windows)
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
                 this.Skip = "This test requires Windows to run";
             }
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyTheoryAttribute.cs b/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyTheoryAttribute.cs
index 8a663433f77c..98a0267b06d7 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyTheoryAttribute.cs
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/WindowsOnlyTheoryAttribute.cs
@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using Microsoft.DotNet.PlatformAbstractions;
+using System.Runtime.InteropServices;
 using Xunit;
 
 namespace Microsoft.DotNet.Tools.Test.Utilities
@@ -10,7 +10,7 @@ public class WindowsOnlyTheoryAttribute : TheoryAttribute
     {
         public WindowsOnlyTheoryAttribute()
         {
-            if (RuntimeEnvironment.OperatingSystemPlatform != Platform.Windows)
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
                 this.Skip = "This test requires Windows to run";
             }