diff --git a/build/DependencyVersions.props b/build/DependencyVersions.props
index 17b73a3c4..2d913cd7c 100644
--- a/build/DependencyVersions.props
+++ b/build/DependencyVersions.props
@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <MicrosoftNETCoreAppPackageVersion>3.0.0-preview1-26820-01</MicrosoftNETCoreAppPackageVersion>
+    <MicrosoftNETCoreAppPackageVersion>3.0.0-preview1-26821-04</MicrosoftNETCoreAppPackageVersion>
     <MicrosoftNETCoreDotNetHostResolverPackageVersion>$(MicrosoftNETCoreAppPackageVersion)</MicrosoftNETCoreDotNetHostResolverPackageVersion>
   </PropertyGroup>
 
diff --git a/build/TestDependencyVersions.props b/build/TestDependencyVersions.props
index 5ef11cc81..f513173fd 100644
--- a/build/TestDependencyVersions.props
+++ b/build/TestDependencyVersions.props
@@ -4,6 +4,6 @@
     <MicrosoftDotNetCliUtilsPackageVersion>3.0.100-alpha1-20180711-1</MicrosoftDotNetCliUtilsPackageVersion>
     <MicrosoftDotNetCliCommandLinePackageVersion>0.1.1</MicrosoftDotNetCliCommandLinePackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.8.0</MicrosoftNETTestSdkPackageVersion>
-    <MicrosoftDotNetPlatformAbstractionsPackageVersion>3.0.0-preview1-26820-01</MicrosoftDotNetPlatformAbstractionsPackageVersion>
+    <MicrosoftDotNetPlatformAbstractionsPackageVersion>3.0.0-preview1-26821-04</MicrosoftDotNetPlatformAbstractionsPackageVersion>
   </PropertyGroup>
 </Project>