diff --git a/build/dependencies.props b/build/dependencies.props
index 63c5d0374d..3c84c1289c 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -6,7 +6,7 @@
     <BenchmarkDotNetPackageVersion>0.10.9</BenchmarkDotNetPackageVersion>
     <BuildBundlerMinifierPackageVersion>2.4.337</BuildBundlerMinifierPackageVersion>
     <GoogleProtobufPackageVersion>3.1.0</GoogleProtobufPackageVersion>
-    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15618</InternalAspNetCoreSdkPackageVersion>
+    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15620</InternalAspNetCoreSdkPackageVersion>
     <MicrosoftAspNetCoreAuthenticationCookiesPackageVersion>2.1.0-preview1-27773</MicrosoftAspNetCoreAuthenticationCookiesPackageVersion>
     <MicrosoftAspNetCoreAuthenticationCorePackageVersion>2.1.0-preview1-27773</MicrosoftAspNetCoreAuthenticationCorePackageVersion>
     <MicrosoftAspNetCoreAuthenticationJwtBearerPackageVersion>2.1.0-preview1-27773</MicrosoftAspNetCoreAuthenticationJwtBearerPackageVersion>
@@ -53,22 +53,22 @@
     <MicrosoftExtensionsSecurityHelperSourcesPackageVersion>2.1.0-preview1-27773</MicrosoftExtensionsSecurityHelperSourcesPackageVersion>
     <MicrosoftExtensionsValueStopwatchSourcesPackageVersion>2.1.0-preview1-27773</MicrosoftExtensionsValueStopwatchSourcesPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.0</MicrosoftNETCoreApp20PackageVersion>
-    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview1-25915-01</MicrosoftNETCoreApp21PackageVersion>
+    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview1-26008-01</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.3.0</MicrosoftNETTestSdkPackageVersion>
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
     <MsgPackCliPackageVersion>0.9.0-beta2</MsgPackCliPackageVersion>
     <NewtonsoftJsonPackageVersion>10.0.1</NewtonsoftJsonPackageVersion>
     <StackExchangeRedisStrongNamePackageVersion>1.2.4</StackExchangeRedisStrongNamePackageVersion>
-    <SystemBuffersPrimitivesPackageVersion>0.1.0-alpha-002</SystemBuffersPrimitivesPackageVersion>
-    <SystemIOPipelinesExtensionsPackageVersion>0.1.0-alpha-002</SystemIOPipelinesExtensionsPackageVersion>
-    <SystemIOPipelinesPackageVersion>0.1.0-alpha-002</SystemIOPipelinesPackageVersion>
-    <SystemMemoryPackageVersion>4.5.0-preview1-25914-04</SystemMemoryPackageVersion>
-    <SystemNumericsVectorsPackageVersion>4.5.0-preview1-25914-04</SystemNumericsVectorsPackageVersion>
+    <SystemBuffersPrimitivesPackageVersion>0.1.0-e171206-2</SystemBuffersPrimitivesPackageVersion>
+    <SystemIOPipelinesExtensionsPackageVersion>0.1.0-e171206-2</SystemIOPipelinesExtensionsPackageVersion>
+    <SystemIOPipelinesPackageVersion>0.1.0-e171206-2</SystemIOPipelinesPackageVersion>
+    <SystemMemoryPackageVersion>4.5.0-preview1-26006-06</SystemMemoryPackageVersion>
+    <SystemNumericsVectorsPackageVersion>4.5.0-preview1-26006-06</SystemNumericsVectorsPackageVersion>
     <SystemReactiveLinqPackageVersion>3.1.1</SystemReactiveLinqPackageVersion>
     <SystemReflectionEmitPackageVersion>4.3.0</SystemReflectionEmitPackageVersion>
-    <SystemRuntimeCompilerServicesUnsafePackageVersion>4.5.0-preview1-25914-04</SystemRuntimeCompilerServicesUnsafePackageVersion>
-    <SystemThreadingChannelsPackageVersion>4.5.0-preview1-25914-04</SystemThreadingChannelsPackageVersion>
-    <SystemThreadingTasksExtensionsPackageVersion>4.5.0-preview2-25707-02</SystemThreadingTasksExtensionsPackageVersion>
+    <SystemRuntimeCompilerServicesUnsafePackageVersion>4.5.0-preview1-26006-06</SystemRuntimeCompilerServicesUnsafePackageVersion>
+    <SystemThreadingChannelsPackageVersion>4.5.0-preview1-26006-06</SystemThreadingChannelsPackageVersion>
+    <SystemThreadingTasksExtensionsPackageVersion>4.5.0-preview1-26006-06</SystemThreadingTasksExtensionsPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>
     <XunitRunnerVisualStudioPackageVersion>2.3.1</XunitRunnerVisualStudioPackageVersion>
   </PropertyGroup>
diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index e7cce93009..fe4a961da3 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview1-15618
-commithash:00ce1383114015fe89b221146036e59e6bc11219
+version:2.1.0-preview1-15620
+commithash:6432b49a2c00310416df39b6fe548ef4af9c6011