diff --git a/src/libraries/System.ComponentModel.Composition.Registration/tests/System/ComponentModel/Composition/Registration/RegistrationBuilderAttributedOverrideUnitTests.cs b/src/libraries/System.ComponentModel.Composition.Registration/tests/System/ComponentModel/Composition/Registration/RegistrationBuilderAttributedOverrideUnitTests.cs
index 7144f04d5ff0e..96cd33d298a41 100644
--- a/src/libraries/System.ComponentModel.Composition.Registration/tests/System/ComponentModel/Composition/Registration/RegistrationBuilderAttributedOverrideUnitTests.cs
+++ b/src/libraries/System.ComponentModel.Composition.Registration/tests/System/ComponentModel/Composition/Registration/RegistrationBuilderAttributedOverrideUnitTests.cs
@@ -8,7 +8,6 @@
 using System.Reflection;
 using Xunit;
 using Xunit.Sdk;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.ComponentModel.Composition.Registration.Tests
 {
diff --git a/src/libraries/System.Data.SqlClient/tests/FunctionalTests/AssemblyInfo.cs b/src/libraries/System.Data.SqlClient/tests/FunctionalTests/AssemblyInfo.cs
index 04cc84c580686..0d7eda9ff9c4b 100644
--- a/src/libraries/System.Data.SqlClient/tests/FunctionalTests/AssemblyInfo.cs
+++ b/src/libraries/System.Data.SqlClient/tests/FunctionalTests/AssemblyInfo.cs
@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 [assembly: SkipOnCoreClr("Timeout in stress tests on Linux/arm32", TestPlatforms.Linux)]
 [assembly: SkipOnMono("Timeout in stress tests on Linux/arm32", TestPlatforms.Linux)]
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/AssemblyInfo.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/AssemblyInfo.cs
index fe9200ef2ee8b..2fbf85306bc7c 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/AssemblyInfo.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/AssemblyInfo.cs
@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 [assembly: SkipOnCoreClr("System.Net.Tests are flaky and/or long running: https://github.com/dotnet/runtime/issues/131")]
 [assembly: SkipOnMono("System.Net.Tests are flaky and/or long running: https://github.com/dotnet/runtime/issues/131")]
diff --git a/src/libraries/System.Net.HttpListener/tests/HttpListenerAuthenticationTests.cs b/src/libraries/System.Net.HttpListener/tests/HttpListenerAuthenticationTests.cs
index 15681d8b0487b..d00fa73485afe 100644
--- a/src/libraries/System.Net.HttpListener/tests/HttpListenerAuthenticationTests.cs
+++ b/src/libraries/System.Net.HttpListener/tests/HttpListenerAuthenticationTests.cs
@@ -10,7 +10,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Tests
 {
diff --git a/src/libraries/System.Net.HttpListener/tests/HttpListenerContextTests.cs b/src/libraries/System.Net.HttpListener/tests/HttpListenerContextTests.cs
index 4a79e3b80c3b6..44c83759f3816 100644
--- a/src/libraries/System.Net.HttpListener/tests/HttpListenerContextTests.cs
+++ b/src/libraries/System.Net.HttpListener/tests/HttpListenerContextTests.cs
@@ -11,7 +11,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Tests
 {
diff --git a/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.Cookies.cs b/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.Cookies.cs
index 2bac73efd3143..a0b71cca78606 100644
--- a/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.Cookies.cs
+++ b/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.Cookies.cs
@@ -6,7 +6,6 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Tests
 {
diff --git a/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.cs b/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.cs
index dad158e9cca19..6d6cfa79697bf 100644
--- a/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.cs
+++ b/src/libraries/System.Net.HttpListener/tests/HttpListenerResponseTests.cs
@@ -7,7 +7,6 @@
 using System.Text;
 using System.Threading.Tasks;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Tests
 {
diff --git a/src/libraries/System.Net.Mail/tests/Functional/SmtpClientTest.cs b/src/libraries/System.Net.Mail/tests/Functional/SmtpClientTest.cs
index 487218fce3198..e10bba2eccf43 100644
--- a/src/libraries/System.Net.Mail/tests/Functional/SmtpClientTest.cs
+++ b/src/libraries/System.Net.Mail/tests/Functional/SmtpClientTest.cs
@@ -16,7 +16,6 @@
 using System.Threading.Tasks;
 using Systen.Net.Mail.Tests;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Mail.Tests
 {
diff --git a/src/libraries/System.Net.Requests/tests/LoggingTest.cs b/src/libraries/System.Net.Requests/tests/LoggingTest.cs
index 2a08b2bf48b48..d5ae6a58ceab0 100644
--- a/src/libraries/System.Net.Requests/tests/LoggingTest.cs
+++ b/src/libraries/System.Net.Requests/tests/LoggingTest.cs
@@ -4,7 +4,6 @@
 
 using System.Diagnostics.Tracing;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Tests
 {
diff --git a/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamSniTest.cs b/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamSniTest.cs
index 5d4c4968d768f..3a4f0687a63a0 100644
--- a/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamSniTest.cs
+++ b/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamSniTest.cs
@@ -9,7 +9,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Net.Security.Tests
 {
diff --git a/src/libraries/System.Net.Sockets/tests/FunctionalTests/AssemblyInfo.cs b/src/libraries/System.Net.Sockets/tests/FunctionalTests/AssemblyInfo.cs
index fe9200ef2ee8b..2fbf85306bc7c 100644
--- a/src/libraries/System.Net.Sockets/tests/FunctionalTests/AssemblyInfo.cs
+++ b/src/libraries/System.Net.Sockets/tests/FunctionalTests/AssemblyInfo.cs
@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 [assembly: SkipOnCoreClr("System.Net.Tests are flaky and/or long running: https://github.com/dotnet/runtime/issues/131")]
 [assembly: SkipOnMono("System.Net.Tests are flaky and/or long running: https://github.com/dotnet/runtime/issues/131")]
diff --git a/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs b/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs
index 775e8d4117c45..cc4cc50536a4d 100644
--- a/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs
+++ b/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs
@@ -5,7 +5,6 @@
 using System;
 using System.Runtime.CompilerServices;
 using Xunit;
-using Microsoft.DotNet.XUnitExtensions.Attributes;
 
 namespace System.Runtime.CompilerServices.Tests
 {