diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/JsonSerializerContextTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/JsonSerializerContextTests.cs
index bbba4443cc474a..0576274dc8955f 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/JsonSerializerContextTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/JsonSerializerContextTests.cs
@@ -24,7 +24,7 @@ public static void VariousNestingAndVisibilityLevelsAreSupported()
         public static void Converters_AndTypeInfoCreator_NotRooted_WhenMetadataNotPresent()
         {
             RemoteExecutor.Invoke(
-                () =>
+                static () =>
                 {
                     object[] objArr = new object[] { new MyStruct() };
 
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
index 37daa9b189ada6..c16738ce5056d6 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
@@ -218,7 +218,7 @@ public static void JsonSerializerOptionsUpdateHandler_ClearingDoesntPreventSeria
             //
             // If either of them changes, this test will need to be kept in sync.
 
-            RemoteExecutor.Invoke(() =>
+            RemoteExecutor.Invoke(static () =>
                 {
                     var options = new JsonSerializerOptions();
 
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.cs
index 0ec72a2e90e078..e7055c2db1a67c 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.cs
@@ -180,10 +180,11 @@ void RunTest<TConverterReturn>()
         }
 
         [ActiveIssue("https://github.com/dotnet/runtime/issues/66232", TargetFrameworkMonikers.NetFramework)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/66371", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoInterpreter))] 
         [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
         public static void GetConverter_Poco_WriteThrowsNotSupportedException()
         {
-            RemoteExecutor.Invoke(() =>
+            RemoteExecutor.Invoke(static () =>
             {
                 JsonSerializerOptions options = new();
                 JsonConverter<Point_2D> converter = (JsonConverter<Point_2D>)options.GetConverter(typeof(Point_2D));