diff --git a/build/dependencies.props b/build/dependencies.props
index 0df8ea53e8..8e42c8786e 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -7,7 +7,7 @@
     <NETStandardImplicitPackageVersion>2.0.0-*</NETStandardImplicitPackageVersion>
     <NETStandardLibraryNETFrameworkVersion>2.0.0-*</NETStandardLibraryNETFrameworkVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
-    <TestSdkVersion>15.3.0-*</TestSdkVersion>
-    <XunitVersion>2.3.0-beta2-*</XunitVersion>
+    <TestSdkVersion>15.3.0</TestSdkVersion>
+    <XunitVersion>2.3.0-beta4-build3742</XunitVersion>
   </PropertyGroup>
 </Project>
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/RequestLocalizationOptionsTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/RequestLocalizationOptionsTest.cs
index c74c9704d5..12c6f0aca6 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/RequestLocalizationOptionsTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/RequestLocalizationOptionsTest.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved. 
+// 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;
@@ -54,7 +54,7 @@ namespace Microsoft.AspNetCore.Localization
             var options = new RequestLocalizationOptions();
 
             // Act/Assert
-            Assert.Throws(typeof(ArgumentNullException), () => options.DefaultRequestCulture = null);
+            Assert.Throws<ArgumentNullException>(() => options.DefaultRequestCulture = null);
         }
 
         [Fact]
diff --git a/test/Microsoft.Extensions.Localization.Tests/ResourceManagerStringLocalizerTest.cs b/test/Microsoft.Extensions.Localization.Tests/ResourceManagerStringLocalizerTest.cs
index 78f0de9439..58fe3561ca 100644
--- a/test/Microsoft.Extensions.Localization.Tests/ResourceManagerStringLocalizerTest.cs
+++ b/test/Microsoft.Extensions.Localization.Tests/ResourceManagerStringLocalizerTest.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved. 
+// 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.Globalization;
@@ -132,8 +132,8 @@ namespace Microsoft.Extensions.Localization
             var value = localizer["a key!"];
 
             // Assert
-            Assert.Equal(1, Sink.Writes.Count);
-            Assert.Equal("ResourceManagerStringLocalizer searched for 'a key!' in 'Resources.TestResource' with culture 'en-US'.", Sink.Writes.First().State.ToString());
+            var write = Assert.Single(Sink.Writes);
+            Assert.Equal("ResourceManagerStringLocalizer searched for 'a key!' in 'Resources.TestResource' with culture 'en-US'.", write.State.ToString());
         }
 
         [Theory]