diff --git a/build/dependencies.props b/build/dependencies.props
index b675bd2662..a1b165f0b0 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -3,24 +3,24 @@
     <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
   </PropertyGroup>
   <PropertyGroup Label="Package Versions">
-    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15651</InternalAspNetCoreSdkPackageVersion>
-    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
-    <MicrosoftAspNetCoreRoutingAbstractionsPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreRoutingAbstractionsPackageVersion>
-    <MicrosoftAspNetCoreRoutingPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreRoutingPackageVersion>
-    <MicrosoftAspNetCoreServerIISIntegrationPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreServerIISIntegrationPackageVersion>
-    <MicrosoftAspNetCoreServerKestrelPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreServerKestrelPackageVersion>
-    <MicrosoftAspNetCoreTestHostPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreTestHostPackageVersion>
-    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview1-27965</MicrosoftAspNetCoreTestingPackageVersion>
-    <MicrosoftExtensionsConfigurationCommandLinePackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsConfigurationCommandLinePackageVersion>
-    <MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>
-    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsDependencyInjectionPackageVersion>
-    <MicrosoftExtensionsLoggingAbstractionsPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsLoggingAbstractionsPackageVersion>
-    <MicrosoftExtensionsLoggingConsolePackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsLoggingConsolePackageVersion>
-    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsLoggingPackageVersion>
-    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsLoggingTestingPackageVersion>
-    <MicrosoftExtensionsOptionsPackageVersion>2.1.0-preview1-27965</MicrosoftExtensionsOptionsPackageVersion>
+    <InternalAspNetCoreSdkPackageVersion>2.1.0-preview1-15678</InternalAspNetCoreSdkPackageVersion>
+    <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
+    <MicrosoftAspNetCoreRoutingAbstractionsPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreRoutingAbstractionsPackageVersion>
+    <MicrosoftAspNetCoreRoutingPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreRoutingPackageVersion>
+    <MicrosoftAspNetCoreServerIISIntegrationPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreServerIISIntegrationPackageVersion>
+    <MicrosoftAspNetCoreServerKestrelPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreServerKestrelPackageVersion>
+    <MicrosoftAspNetCoreTestHostPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreTestHostPackageVersion>
+    <MicrosoftAspNetCoreTestingPackageVersion>2.1.0-preview1-28140</MicrosoftAspNetCoreTestingPackageVersion>
+    <MicrosoftExtensionsConfigurationCommandLinePackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsConfigurationCommandLinePackageVersion>
+    <MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion>
+    <MicrosoftExtensionsDependencyInjectionPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsDependencyInjectionPackageVersion>
+    <MicrosoftExtensionsLoggingAbstractionsPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsLoggingAbstractionsPackageVersion>
+    <MicrosoftExtensionsLoggingConsolePackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsLoggingConsolePackageVersion>
+    <MicrosoftExtensionsLoggingPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsLoggingPackageVersion>
+    <MicrosoftExtensionsLoggingTestingPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsLoggingTestingPackageVersion>
+    <MicrosoftExtensionsOptionsPackageVersion>2.1.0-preview1-28140</MicrosoftExtensionsOptionsPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.0</MicrosoftNETCoreApp20PackageVersion>
-    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview1-26016-05</MicrosoftNETCoreApp21PackageVersion>
+    <MicrosoftNETCoreApp21PackageVersion>2.1.0-preview1-26115-03</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETTestSdkPackageVersion>15.3.0</MicrosoftNETTestSdkPackageVersion>
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>
diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index 2146d006d7..84f798d53f 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview1-15661
-commithash:c9349d4c8a495d3085d9b879214d80f2f45e2193
+version:2.1.0-preview1-15678
+commithash:5347461137cb45a77ddcc0b55b2478092de43338
diff --git a/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs b/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
index dd32fb665f..d78581655c 100644
--- a/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
+++ b/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Linq;
 using Microsoft.Extensions.Localization;
 using Microsoft.Extensions.Options;
@@ -20,16 +21,8 @@ namespace Microsoft.Extensions.DependencyInjection
             LocalizationServiceCollectionExtensions.AddLocalizationServices(collection);
 
             // Assert
-            var services = collection.ToList();
-            Assert.Equal(2, services.Count);
-
-            Assert.Equal(typeof(IStringLocalizerFactory), services[0].ServiceType);
-            Assert.Equal(typeof(ResourceManagerStringLocalizerFactory), services[0].ImplementationType);
-            Assert.Equal(ServiceLifetime.Singleton, services[0].Lifetime);
-
-            Assert.Equal(typeof(IStringLocalizer<>), services[1].ServiceType);
-            Assert.Equal(typeof(StringLocalizer<>), services[1].ImplementationType);
-            Assert.Equal(ServiceLifetime.Transient, services[1].Lifetime);
+            AssertContainsSingle(collection, typeof(IStringLocalizerFactory), typeof(ResourceManagerStringLocalizerFactory));
+            AssertContainsSingle(collection, typeof(IStringLocalizer<>), typeof(StringLocalizer<>));
         }
 
         [Fact]
@@ -43,20 +36,33 @@ namespace Microsoft.Extensions.DependencyInjection
                 collection,
                 options => options.ResourcesPath = "Resources");
 
-            // Assert
-            var services = collection.ToList();
-            Assert.Equal(3, services.Count);
+            AssertContainsSingle(collection, typeof(IStringLocalizerFactory), typeof(ResourceManagerStringLocalizerFactory));
+            AssertContainsSingle(collection, typeof(IStringLocalizer<>), typeof(StringLocalizer<>));
+        }
 
-            Assert.Equal(typeof(IStringLocalizerFactory), services[0].ServiceType);
-            Assert.Equal(typeof(ResourceManagerStringLocalizerFactory), services[0].ImplementationType);
-            Assert.Equal(ServiceLifetime.Singleton, services[0].Lifetime);
+        private void AssertContainsSingle(
+            IServiceCollection services,
+            Type serviceType,
+            Type implementationType)
+        {
+            var matches = services
+                .Where(sd =>
+                    sd.ServiceType == serviceType &&
+                    sd.ImplementationType == implementationType)
+                .ToArray();
 
-            Assert.Equal(typeof(IStringLocalizer<>), services[1].ServiceType);
-            Assert.Equal(typeof(StringLocalizer<>), services[1].ImplementationType);
-            Assert.Equal(ServiceLifetime.Transient, services[1].Lifetime);
-
-            Assert.Equal(typeof(IConfigureOptions<LocalizationOptions>), services[2].ServiceType);
-            Assert.Equal(ServiceLifetime.Singleton, services[2].Lifetime);
+            if (matches.Length == 0)
+            {
+                Assert.True(
+                    false,
+                    $"Could not find an instance of {implementationType} registered as {serviceType}");
+            }
+            else if (matches.Length > 1)
+            {
+                Assert.True(
+                    false,
+                    $"Found multiple instances of {implementationType} registered as {serviceType}");
+            }
         }
     }
 }