diff --git a/build/dependencies.props b/build/dependencies.props
index 203f4c839f..5fa9cd8a58 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -3,22 +3,21 @@
     <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
   </PropertyGroup>
   <PropertyGroup Label="Package Versions">
-    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15541</InternalAspNetCoreSdkPackageVersion>
-    <MicrosoftAspNetCoreDataProtectionPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreDataProtectionPackageVersion>
-    <MicrosoftAspNetCoreHttpAbstractionsPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreHttpAbstractionsPackageVersion>
-    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
-    <MicrosoftAspNetCoreHttpPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreHttpPackageVersion>
-    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreTestingPackageVersion>
-    <MicrosoftAspNetCoreWebUtilitiesPackageVersion>2.1.0-preview1-27430</MicrosoftAspNetCoreWebUtilitiesPackageVersion>
-    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-preview1-27430</MicrosoftExtensionsDependencyInjectionPackageVersion>
-    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-preview1-27430</MicrosoftExtensionsLoggingPackageVersion>
-    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-preview1-27430</MicrosoftExtensionsLoggingTestingPackageVersion>
-    <MicrosoftExtensionsObjectPoolPackageVersion>2.1.0-preview1-27430</MicrosoftExtensionsObjectPoolPackageVersion>
-    <MicrosoftExtensionsWebEncodersPackageVersion>2.1.0-preview1-27430</MicrosoftExtensionsWebEncodersPackageVersion>
+    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15549</InternalAspNetCoreSdkPackageVersion>
+    <MicrosoftAspNetCoreDataProtectionPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreDataProtectionPackageVersion>
+    <MicrosoftAspNetCoreHttpAbstractionsPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreHttpAbstractionsPackageVersion>
+    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
+    <MicrosoftAspNetCoreHttpPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreHttpPackageVersion>
+    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreTestingPackageVersion>
+    <MicrosoftAspNetCoreWebUtilitiesPackageVersion>2.1.0-preview1-27475</MicrosoftAspNetCoreWebUtilitiesPackageVersion>
+    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-preview1-27475</MicrosoftExtensionsDependencyInjectionPackageVersion>
+    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-preview1-27475</MicrosoftExtensionsLoggingPackageVersion>
+    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-preview1-27475</MicrosoftExtensionsLoggingTestingPackageVersion>
+    <MicrosoftExtensionsObjectPoolPackageVersion>2.1.0-preview1-27475</MicrosoftExtensionsObjectPoolPackageVersion>
+    <MicrosoftExtensionsWebEncodersPackageVersion>2.1.0-preview1-27475</MicrosoftExtensionsWebEncodersPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.0</MicrosoftNETCoreApp20PackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.3.0</MicrosoftNETTestSdkPackageVersion>
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
-    <NETStandardLibraryPackageVersion>2.0.0</NETStandardLibraryPackageVersion>
     <XunitPackageVersion>2.3.0</XunitPackageVersion>
     <XunitRunnerVisualStudioPackageVersion>2.3.0</XunitRunnerVisualStudioPackageVersion>
   </PropertyGroup>
diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index 5dfe0a2e0d..45463cc71e 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview1-15541
-commithash:0f388d759de1c87fe58383bc9eb1020228885d4d
+version:2.1.0-preview1-15549
+commithash:f570e08585fec510dd60cd4bfe8795388b757a95
diff --git a/version.props b/version.props
index e5fd0676de..5c4a7c32d1 100644
--- a/version.props
+++ b/version.props
@@ -4,6 +4,7 @@
     <VersionSuffix>preview1</VersionSuffix>
     <PackageVersion Condition="'$(IsFinalBuild)' == 'true' AND '$(VersionSuffix)' == 'rtm' ">$(VersionPrefix)</PackageVersion>
     <PackageVersion Condition="'$(IsFinalBuild)' == 'true' AND '$(VersionSuffix)' != 'rtm' ">$(VersionPrefix)-$(VersionSuffix)-final</PackageVersion>
+    <BuildNumber Condition="'$(BuildNumber)' == ''">t000</BuildNumber>
     <VersionSuffix Condition="'$(VersionSuffix)' != '' And '$(BuildNumber)' != ''">$(VersionSuffix)-$(BuildNumber)</VersionSuffix>
   </PropertyGroup>
 </Project>