diff --git a/src/ProjectTemplates/test/Templates.Blazor.Tests/BlazorWasmTemplateTest.cs b/src/ProjectTemplates/test/Templates.Blazor.Tests/BlazorWasmTemplateTest.cs
index 64534df9249c..59a4eb2911d7 100644
--- a/src/ProjectTemplates/test/Templates.Blazor.Tests/BlazorWasmTemplateTest.cs
+++ b/src/ProjectTemplates/test/Templates.Blazor.Tests/BlazorWasmTemplateTest.cs
@@ -6,6 +6,7 @@
 using System.Text.RegularExpressions;
 using Microsoft.AspNetCore.BrowserTesting;
 using Microsoft.AspNetCore.Internal;
+using Microsoft.AspNetCore.InternalTesting;
 using Microsoft.Extensions.CommandLineUtils;
 using Microsoft.Playwright;
 using Templates.Test.Helpers;
@@ -14,6 +15,7 @@ namespace BlazorTemplates.Tests;
 
 #pragma warning disable xUnit1041 // Fixture arguments to test classes must have fixture sources
 
+[QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/#66293")]
 public class BlazorWasmTemplateTest(ProjectFactoryFixture projectFactory) : BlazorTemplateTest(projectFactory)
 {
     public override string ProjectType { get; } = "blazorwasm";
diff --git a/src/ProjectTemplates/test/Templates.Blazor.Tests/WebWorkerTemplateE2ETest.cs b/src/ProjectTemplates/test/Templates.Blazor.Tests/WebWorkerTemplateE2ETest.cs
index 59d74bd12b3c..d88eb6a73449 100644
--- a/src/ProjectTemplates/test/Templates.Blazor.Tests/WebWorkerTemplateE2ETest.cs
+++ b/src/ProjectTemplates/test/Templates.Blazor.Tests/WebWorkerTemplateE2ETest.cs
@@ -15,6 +15,7 @@ namespace BlazorTemplates.Tests;
 
 #pragma warning disable xUnit1041 // Fixture arguments to test classes must have fixture sources
 
+[QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/#66292")]
 public class WebWorkerTemplateE2ETest(ProjectFactoryFixture projectFactory) : BlazorTemplateTest(projectFactory)
 {
     public override string ProjectType => "blazorwasm";
diff --git a/src/Servers/IIS/IIS/test/Common.LongTests/ShutdownTests.cs b/src/Servers/IIS/IIS/test/Common.LongTests/ShutdownTests.cs
index ea80e1fe7744..5743ca4f6deb 100644
--- a/src/Servers/IIS/IIS/test/Common.LongTests/ShutdownTests.cs
+++ b/src/Servers/IIS/IIS/test/Common.LongTests/ShutdownTests.cs
@@ -556,7 +556,6 @@ public async Task ConfigurationChangeCanBeIgnoredOutOfProcess()
         await deploymentResult.HttpClient.RetryRequestAsync("/ProcessId", async r => await r.Content.ReadAsStringAsync() == processBefore);
     }
 
-    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/55937")]
     [ConditionalFact]
     public async Task OutOfProcessToInProcessHostingModelSwitchWorks()
     {