diff --git a/eng/Versions.props b/eng/Versions.props
index 6c958b9372..88c583135e 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -12,7 +12,7 @@
   </PropertyGroup>
   <!-- Production Dependencies -->
   <PropertyGroup>
-    <DotNetCoreSdkLKGVersion>3.0.100-preview5-011317</DotNetCoreSdkLKGVersion>
+    <DotNetCoreSdkLKGVersion>3.0.100-preview5-011462</DotNetCoreSdkLKGVersion>
     <MicrosoftAspNetCoreDeveloperCertificatesXPlatPackageVersion>2.2.0</MicrosoftAspNetCoreDeveloperCertificatesXPlatPackageVersion>
     <MicrosoftNETCoreDotNetHostResolverPackageVersion>2.2.1</MicrosoftNETCoreDotNetHostResolverPackageVersion>
     <MicrosoftApplicationInsightsPackageVersion>2.0.0</MicrosoftApplicationInsightsPackageVersion>
diff --git a/global.json b/global.json
index c55a15b7c7..c0fafda3c0 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "3.0.100-preview5-011317"
+    "dotnet": "3.0.100-preview5-011462"
   },
   "msbuild-sdks": {
     "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.19218.1"
diff --git a/src/dotnet/ToolManifest/ArrayBufferWriter.cs b/src/dotnet/ToolManifest/ArrayBufferWriter.cs
deleted file mode 100644
index e72d19f4e8..0000000000
--- a/src/dotnet/ToolManifest/ArrayBufferWriter.cs
+++ /dev/null
@@ -1,182 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-using System;
-using System.Buffers;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-
-// TODO Remove once we have https://github.com/dotnet/corefx/issues/34894
-
-namespace Microsoft.DotNet.Cli.Utils
-{
-    // Note: this is an internal class that will be replaced with a shared version.
-    internal sealed class ArrayBufferWriter<T> : IBufferWriter<T>, IDisposable
-    {
-        private T[] _rentedBuffer;
-        private int _index;
-
-        private const int MinimumBufferSize = 256;
-
-        public ArrayBufferWriter()
-        {
-            _rentedBuffer = ArrayPool<T>.Shared.Rent(MinimumBufferSize);
-            _index = 0;
-        }
-
-        public ArrayBufferWriter(int initialCapacity)
-        {
-            if (initialCapacity <= 0)
-                throw new ArgumentException(nameof(initialCapacity));
-
-            _rentedBuffer = ArrayPool<T>.Shared.Rent(initialCapacity);
-            _index = 0;
-        }
-
-        public ReadOnlyMemory<T> WrittenMemory
-        {
-            get
-            {
-                CheckIfDisposed();
-
-                return _rentedBuffer.AsMemory(0, _index);
-            }
-        }
-
-        public int WrittenCount
-        {
-            get
-            {
-                CheckIfDisposed();
-
-                return _index;
-            }
-        }
-
-        public int Capacity
-        {
-            get
-            {
-                CheckIfDisposed();
-
-                return _rentedBuffer.Length;
-            }
-        }
-
-        public int FreeCapacity
-        {
-            get
-            {
-                CheckIfDisposed();
-
-                return _rentedBuffer.Length - _index;
-            }
-        }
-
-        public void Clear()
-        {
-            CheckIfDisposed();
-
-            ClearHelper();
-        }
-
-        private void ClearHelper()
-        {
-            Debug.Assert(_rentedBuffer != null);
-
-            _rentedBuffer.AsSpan(0, _index).Clear();
-            _index = 0;
-        }
-
-        // Returns the rented buffer back to the pool
-        public void Dispose()
-        {
-            if (_rentedBuffer == null)
-            {
-                return;
-            }
-
-            ClearHelper();
-            ArrayPool<T>.Shared.Return(_rentedBuffer);
-            _rentedBuffer = null;
-        }
-
-        private void CheckIfDisposed()
-        {
-            if (_rentedBuffer == null)
-                throw new ObjectDisposedException(nameof(ArrayBufferWriter<T>));
-        }
-
-        public void Advance(int count)
-        {
-            CheckIfDisposed();
-
-            if (count < 0)
-                throw new ArgumentException(nameof(count));
-
-            if (_index > _rentedBuffer.Length - count)
-                ThrowInvalidOperationException(_rentedBuffer.Length);
-
-            _index += count;
-        }
-
-        public Memory<T> GetMemory(int sizeHint = 0)
-        {
-            CheckIfDisposed();
-
-            CheckAndResizeBuffer(sizeHint);
-            return _rentedBuffer.AsMemory(_index);
-        }
-
-        public Span<T> GetSpan(int sizeHint = 0)
-        {
-            CheckIfDisposed();
-
-            CheckAndResizeBuffer(sizeHint);
-            return _rentedBuffer.AsSpan(_index);
-        }
-
-        private void CheckAndResizeBuffer(int sizeHint)
-        {
-            Debug.Assert(_rentedBuffer != null);
-
-            if (sizeHint < 0)
-                throw new ArgumentException(nameof(sizeHint));
-
-            if (sizeHint == 0)
-            {
-                sizeHint = MinimumBufferSize;
-            }
-
-            int availableSpace = _rentedBuffer.Length - _index;
-
-            if (sizeHint > availableSpace)
-            {
-                int growBy = Math.Max(sizeHint, _rentedBuffer.Length);
-
-                int newSize = checked(_rentedBuffer.Length + growBy);
-
-                T[] oldBuffer = _rentedBuffer;
-
-                _rentedBuffer = ArrayPool<T>.Shared.Rent(newSize);
-
-                Debug.Assert(oldBuffer.Length >= _index);
-                Debug.Assert(_rentedBuffer.Length >= _index);
-
-                Span<T> previousBuffer = oldBuffer.AsSpan(0, _index);
-                previousBuffer.CopyTo(_rentedBuffer);
-                previousBuffer.Clear();
-                ArrayPool<T>.Shared.Return(oldBuffer);
-            }
-
-            Debug.Assert(_rentedBuffer.Length - _index > 0);
-            Debug.Assert(_rentedBuffer.Length - _index >= sizeHint);
-        }
-
-        private static void ThrowInvalidOperationException(int capacity)
-        {
-            throw new InvalidOperationException($"Cannot advance past the end of the buffer, which has a size of { capacity }");
-        }
-    }
-}
diff --git a/src/dotnet/ToolManifest/ToolManifestEditor.cs b/src/dotnet/ToolManifest/ToolManifestEditor.cs
index 1c9bafd4fb..38ee22ad0c 100644
--- a/src/dotnet/ToolManifest/ToolManifestEditor.cs
+++ b/src/dotnet/ToolManifest/ToolManifestEditor.cs
@@ -15,6 +15,7 @@
 using NuGet.Versioning;
 using System.Text.Json;
 using System.Text;
+using System.Buffers;
 
 namespace Microsoft.DotNet.ToolManifest
 {
@@ -75,7 +76,8 @@ public void Add(
 
             deserializedManifest.Tools.Add(
                 new SerializableLocalToolSinglePackage
-                {   PackageId = packageId.ToString(),
+                {
+                    PackageId = packageId.ToString(),
                     Version = nuGetVersion.ToNormalizedString(),
                     Commands = toolCommandNames.Select(c => c.Value).ToArray()
                 });
@@ -359,10 +361,9 @@ private class SerializableLocalToolsManifest
 
             public string ToJson()
             {
-                var state = new JsonWriterState(options: new JsonWriterOptions { Indented = true });
-                using (var arrayBufferWriter = new ArrayBufferWriter<byte>())
+                var arrayBufferWriter = new ArrayBufferWriter<byte>();
+                using (var writer = new Utf8JsonWriter(arrayBufferWriter, new JsonWriterOptions { Indented = true }))
                 {
-                    var writer = new Utf8JsonWriter(arrayBufferWriter, state);
 
                     writer.WriteStartObject();
 
@@ -394,7 +395,7 @@ public string ToJson()
 
                     writer.WriteEndObject();
                     writer.WriteEndObject();
-                    writer.Flush(true);
+                    writer.Flush();
 
                     return Encoding.UTF8.GetString(arrayBufferWriter.WrittenMemory.ToArray());
                 }