diff --git a/build/dependencies.props b/build/dependencies.props
index c9fa1ebb73..6650548cd6 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -3,47 +3,47 @@
     <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
   </PropertyGroup>
   <PropertyGroup Label="Package Versions">
-    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview3-17018</InternalAspNetCoreSdkPackageVersion>
-    <MicrosoftAspNetCoreHttpAbstractionsPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreHttpAbstractionsPackageVersion>
-    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
-    <MicrosoftAspNetCoreHttpFeaturesPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreHttpFeaturesPackageVersion>
-    <MicrosoftAspNetCoreHttpPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreHttpPackageVersion>
-    <MicrosoftAspNetCoreOwinPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreOwinPackageVersion>
-    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreTestingPackageVersion>
-    <MicrosoftExtensionsConfigurationAbstractionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationAbstractionsPackageVersion>
-    <MicrosoftExtensionsConfigurationBinderPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationBinderPackageVersion>
-    <MicrosoftExtensionsConfigurationCommandLinePackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationCommandLinePackageVersion>
-    <MicrosoftExtensionsConfigurationEnvironmentVariablesPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationEnvironmentVariablesPackageVersion>
-    <MicrosoftExtensionsConfigurationFileExtensionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationFileExtensionsPackageVersion>
-    <MicrosoftExtensionsConfigurationJsonPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationJsonPackageVersion>
-    <MicrosoftExtensionsConfigurationPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsConfigurationPackageVersion>
-    <MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>
-    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsDependencyInjectionPackageVersion>
-    <MicrosoftExtensionsDiagnosticAdapterPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsDiagnosticAdapterPackageVersion>
-    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
-    <MicrosoftExtensionsFileProvidersEmbeddedPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsFileProvidersEmbeddedPackageVersion>
-    <MicrosoftExtensionsFileProvidersPhysicalPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsFileProvidersPhysicalPackageVersion>
-    <MicrosoftExtensionsLoggingAbstractionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsLoggingAbstractionsPackageVersion>
-    <MicrosoftExtensionsLoggingConsolePackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsLoggingConsolePackageVersion>
-    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsLoggingPackageVersion>
-    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsLoggingTestingPackageVersion>
-    <MicrosoftExtensionsOptionsPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsOptionsPackageVersion>
-    <MicrosoftExtensionsProcessSourcesPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsProcessSourcesPackageVersion>
-    <MicrosoftExtensionsRazorViewsSourcesPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsRazorViewsSourcesPackageVersion>
-    <MicrosoftExtensionsStackTraceSourcesPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsStackTraceSourcesPackageVersion>
-    <MicrosoftExtensionsTypeNameHelperSourcesPackageVersion>2.1.0-preview3-32233</MicrosoftExtensionsTypeNameHelperSourcesPackageVersion>
+    <InternalAspNetCoreSdkPackageVersion>2.1.0-rc1-15774</InternalAspNetCoreSdkPackageVersion>
+    <MicrosoftAspNetCoreHttpAbstractionsPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreHttpAbstractionsPackageVersion>
+    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
+    <MicrosoftAspNetCoreHttpFeaturesPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreHttpFeaturesPackageVersion>
+    <MicrosoftAspNetCoreHttpPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreHttpPackageVersion>
+    <MicrosoftAspNetCoreOwinPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreOwinPackageVersion>
+    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-rc1-30613</MicrosoftAspNetCoreTestingPackageVersion>
+    <MicrosoftExtensionsConfigurationAbstractionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationAbstractionsPackageVersion>
+    <MicrosoftExtensionsConfigurationBinderPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationBinderPackageVersion>
+    <MicrosoftExtensionsConfigurationCommandLinePackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationCommandLinePackageVersion>
+    <MicrosoftExtensionsConfigurationEnvironmentVariablesPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationEnvironmentVariablesPackageVersion>
+    <MicrosoftExtensionsConfigurationFileExtensionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationFileExtensionsPackageVersion>
+    <MicrosoftExtensionsConfigurationJsonPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationJsonPackageVersion>
+    <MicrosoftExtensionsConfigurationPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsConfigurationPackageVersion>
+    <MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>
+    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsDependencyInjectionPackageVersion>
+    <MicrosoftExtensionsDiagnosticAdapterPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsDiagnosticAdapterPackageVersion>
+    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
+    <MicrosoftExtensionsFileProvidersEmbeddedPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsFileProvidersEmbeddedPackageVersion>
+    <MicrosoftExtensionsFileProvidersPhysicalPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsFileProvidersPhysicalPackageVersion>
+    <MicrosoftExtensionsLoggingAbstractionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsLoggingAbstractionsPackageVersion>
+    <MicrosoftExtensionsLoggingConsolePackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsLoggingConsolePackageVersion>
+    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsLoggingPackageVersion>
+    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsLoggingTestingPackageVersion>
+    <MicrosoftExtensionsOptionsPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsOptionsPackageVersion>
+    <MicrosoftExtensionsProcessSourcesPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsProcessSourcesPackageVersion>
+    <MicrosoftExtensionsRazorViewsSourcesPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsRazorViewsSourcesPackageVersion>
+    <MicrosoftExtensionsStackTraceSourcesPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsStackTraceSourcesPackageVersion>
+    <MicrosoftExtensionsTypeNameHelperSourcesPackageVersion>2.1.0-rc1-30613</MicrosoftExtensionsTypeNameHelperSourcesPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.0</MicrosoftNETCoreApp20PackageVersion>
-    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview3-26413-05</MicrosoftNETCoreApp21PackageVersion>
+    <MicrosoftNETCoreApp21PackageVersion>2.1.0-rc1-26419-02</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETCoreWindowsApiSetsPackageVersion>1.0.1</MicrosoftNETCoreWindowsApiSetsPackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.6.1</MicrosoftNETTestSdkPackageVersion>
-    <NETStandardLibrary20PackageVersion>2.0.1</NETStandardLibrary20PackageVersion>
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
+    <NETStandardLibrary20PackageVersion>2.0.1</NETStandardLibrary20PackageVersion>
     <SerilogExtensionsLoggingPackageVersion>1.4.0</SerilogExtensionsLoggingPackageVersion>
     <SerilogSinksFilePackageVersion>3.2.0</SerilogSinksFilePackageVersion>
-    <SystemDiagnosticsDiagnosticSourcePackageVersion>4.5.0-preview3-26413-02</SystemDiagnosticsDiagnosticSourcePackageVersion>
-    <SystemIOPipelinesPackageVersion>4.5.0-preview3-26413-02</SystemIOPipelinesPackageVersion>
-    <SystemReflectionMetadataPackageVersion>1.6.0-preview3-26413-02</SystemReflectionMetadataPackageVersion>
-    <SystemServiceProcessServiceControllerPackageVersion>4.5.0-preview3-26413-02</SystemServiceProcessServiceControllerPackageVersion>
+    <SystemDiagnosticsDiagnosticSourcePackageVersion>4.5.0-rc1-26419-03</SystemDiagnosticsDiagnosticSourcePackageVersion>
+    <SystemIOPipelinesPackageVersion>4.5.0-rc1-26419-03</SystemIOPipelinesPackageVersion>
+    <SystemReflectionMetadataPackageVersion>1.6.0-rc1-26419-03</SystemReflectionMetadataPackageVersion>
+    <SystemServiceProcessServiceControllerPackageVersion>4.5.0-rc1-26419-03</SystemServiceProcessServiceControllerPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>
     <XunitRunnerVisualStudioPackageVersion>2.4.0-beta.1.build3945</XunitRunnerVisualStudioPackageVersion>
   </PropertyGroup>
diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index ce2f277c53..d35f5d62cf 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview3-17018
-commithash:af264ca131f212b5ba8aafbc5110fc0fc510a2be
+version:2.1.0-rc1-15774
+commithash:ed5ca9de3c652347dbb0158a9a65eff3471d2114