diff --git a/build/dependencies.props b/build/dependencies.props
index d6bbb1028f..b462993aba 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -12,7 +12,7 @@
     <MicrosoftAspNetCoreAuthorizationPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreAuthorizationPackageVersion>
     <MicrosoftAspNetCoreAuthorizationPolicyPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreAuthorizationPolicyPackageVersion>
     <MicrosoftAspNetCoreBenchmarkRunnerSourcesPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreBenchmarkRunnerSourcesPackageVersion>
-    <MicrosoftAspNetCoreConnectionsAbstractionsPackageVersion>2.1.0-a-preview2-iconnection-17631</MicrosoftAspNetCoreConnectionsAbstractionsPackageVersion>
+    <MicrosoftAspNetCoreConnectionsAbstractionsPackageVersion>2.1.0-a-preview2-mpr-17640</MicrosoftAspNetCoreConnectionsAbstractionsPackageVersion>
     <MicrosoftAspNetCoreCorsPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreCorsPackageVersion>
     <MicrosoftAspNetCoreDiagnosticsEntityFrameworkCorePackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreDiagnosticsEntityFrameworkCorePackageVersion>
     <MicrosoftAspNetCoreDiagnosticsPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreDiagnosticsPackageVersion>
@@ -26,12 +26,12 @@
     <MicrosoftAspNetCoreRoutingPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreRoutingPackageVersion>
     <MicrosoftAspNetCoreServerIISIntegrationPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreServerIISIntegrationPackageVersion>
     <MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>0.5.0-preview2-30478</MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>
-    <MicrosoftAspNetCoreServerKestrelPackageVersion>2.1.0-a-preview2-iconnection-17631</MicrosoftAspNetCoreServerKestrelPackageVersion>
+    <MicrosoftAspNetCoreServerKestrelPackageVersion>2.1.0-a-preview2-mpr-17640</MicrosoftAspNetCoreServerKestrelPackageVersion>
     <MicrosoftAspNetCoreStaticFilesPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreStaticFilesPackageVersion>
     <MicrosoftAspNetCoreTestHostPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreTestHostPackageVersion>
     <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreTestingPackageVersion>
-    <MicrosoftAspNetCoreWebSocketsPackageVersion>2.1.0-preview2-30478</MicrosoftAspNetCoreWebSocketsPackageVersion>
-    <MicrosoftCSharpPackageVersion>4.5.0-preview2-26326-04</MicrosoftCSharpPackageVersion>
+    <MicrosoftAspNetCoreWebSocketsPackageVersion>2.1.0-a-preview2-mpr-16572</MicrosoftAspNetCoreWebSocketsPackageVersion>
+    <MicrosoftCSharpPackageVersion>4.5.0-preview3-26331-02</MicrosoftCSharpPackageVersion>
     <MicrosoftEntityFrameworkCoreDesignPackageVersion>2.1.0-preview2-30478</MicrosoftEntityFrameworkCoreDesignPackageVersion>
     <MicrosoftEntityFrameworkCoreSqlServerPackageVersion>2.1.0-preview2-30478</MicrosoftEntityFrameworkCoreSqlServerPackageVersion>
     <MicrosoftEntityFrameworkCoreToolsPackageVersion>2.1.0-preview2-30478</MicrosoftEntityFrameworkCoreToolsPackageVersion>
@@ -54,21 +54,21 @@
     <MicrosoftExtensionsValueStopwatchSourcesPackageVersion>2.1.0-preview2-30478</MicrosoftExtensionsValueStopwatchSourcesPackageVersion>
     <MicrosoftExtensionsWebEncodersSourcesPackageVersion>2.1.0-preview2-30478</MicrosoftExtensionsWebEncodersSourcesPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.0</MicrosoftNETCoreApp20PackageVersion>
-    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview2-26326-03</MicrosoftNETCoreApp21PackageVersion>
+    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview3-26331-01</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.6.1</MicrosoftNETTestSdkPackageVersion>
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
     <MsgPackCliPackageVersion>1.0.0-rc</MsgPackCliPackageVersion>
     <NewtonsoftJsonPackageVersion>11.0.2</NewtonsoftJsonPackageVersion>
     <StackExchangeRedisStrongNamePackageVersion>1.2.4</StackExchangeRedisStrongNamePackageVersion>
-    <SystemBuffersPackageVersion>4.5.0-preview2-26326-04</SystemBuffersPackageVersion>
-    <SystemIOPipelinesPackageVersion>4.5.0-preview2-26326-04</SystemIOPipelinesPackageVersion>
-    <SystemMemoryPackageVersion>4.5.0-preview2-26326-04</SystemMemoryPackageVersion>
-    <SystemNumericsVectorsPackageVersion>4.5.0-preview2-26326-04</SystemNumericsVectorsPackageVersion>
+    <SystemBuffersPackageVersion>4.5.0-preview3-26331-02</SystemBuffersPackageVersion>
+    <SystemIOPipelinesPackageVersion>4.5.0-preview3-26331-02</SystemIOPipelinesPackageVersion>
+    <SystemMemoryPackageVersion>4.5.0-preview3-26331-02</SystemMemoryPackageVersion>
+    <SystemNumericsVectorsPackageVersion>4.5.0-preview3-26331-02</SystemNumericsVectorsPackageVersion>
     <SystemReactiveLinqPackageVersion>3.1.1</SystemReactiveLinqPackageVersion>
     <SystemReflectionEmitPackageVersion>4.3.0</SystemReflectionEmitPackageVersion>
-    <SystemRuntimeCompilerServicesUnsafePackageVersion>4.5.0-preview2-26326-04</SystemRuntimeCompilerServicesUnsafePackageVersion>
-    <SystemThreadingChannelsPackageVersion>4.5.0-preview2-26326-04</SystemThreadingChannelsPackageVersion>
-    <SystemThreadingTasksExtensionsPackageVersion>4.5.0-preview2-26326-04</SystemThreadingTasksExtensionsPackageVersion>
+    <SystemRuntimeCompilerServicesUnsafePackageVersion>4.5.0-preview3-26331-02</SystemRuntimeCompilerServicesUnsafePackageVersion>
+    <SystemThreadingChannelsPackageVersion>4.5.0-preview3-26331-02</SystemThreadingChannelsPackageVersion>
+    <SystemThreadingTasksExtensionsPackageVersion>4.5.0-preview3-26331-02</SystemThreadingTasksExtensionsPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>
     <XunitRunnerVisualStudioPackageVersion>2.4.0-beta.1.build3945</XunitRunnerVisualStudioPackageVersion>
   </PropertyGroup>
diff --git a/src/Microsoft.AspNetCore.Http.Connections.Client/HttpConnection.cs b/src/Microsoft.AspNetCore.Http.Connections.Client/HttpConnection.cs
index e7c27a5146..1e56e4238f 100644
--- a/src/Microsoft.AspNetCore.Http.Connections.Client/HttpConnection.cs
+++ b/src/Microsoft.AspNetCore.Http.Connections.Client/HttpConnection.cs
@@ -332,7 +332,7 @@ namespace Microsoft.AspNetCore.Http.Connections.Client
         private async Task StartTransport(Uri connectUrl, TransportType transportType, TransferFormat transferFormat)
         {
             // Create the pipe pair (Application's writer is connected to Transport's reader, and vice versa)
-            var options = new PipeOptions(writerScheduler: PipeScheduler.ThreadPool, readerScheduler: PipeScheduler.ThreadPool, useSynchronizationContext: false);
+            var options = new PipeOptions(writerScheduler: PipeScheduler.ThreadPool, readerScheduler: PipeScheduler.ThreadPool, useSynchronizationContext: false, pauseWriterThreshold: 0, resumeWriterThreshold: 0);
             var pair = DuplexPipe.CreateConnectionPair(options, options);
 
             // Construct the transport
diff --git a/test/Microsoft.AspNetCore.SignalR.Tests.Utils/PipeReaderExtensions.cs b/test/Microsoft.AspNetCore.SignalR.Tests.Utils/PipeReaderExtensions.cs
index df2af40261..283e7d65dc 100644
--- a/test/Microsoft.AspNetCore.SignalR.Tests.Utils/PipeReaderExtensions.cs
+++ b/test/Microsoft.AspNetCore.SignalR.Tests.Utils/PipeReaderExtensions.cs
@@ -28,8 +28,8 @@ namespace System.IO.Pipelines
                 }
                 finally
                 {
-                    // Consume nothing, just wait for everything
-                    pipeReader.AdvanceTo(result.Buffer.Start, result.Buffer.End);
+                    // Don't consume or advance
+                    pipeReader.AdvanceTo(result.Buffer.Start, result.Buffer.Start);
                 }
             }
         }