diff --git a/src/JsonApiDotNetCore/Serialization/Building/ResourceObjectBuilder.cs b/src/JsonApiDotNetCore/Serialization/Building/ResourceObjectBuilder.cs
index 3cb7c20435..8fc37aea38 100644
--- a/src/JsonApiDotNetCore/Serialization/Building/ResourceObjectBuilder.cs
+++ b/src/JsonApiDotNetCore/Serialization/Building/ResourceObjectBuilder.cs
@@ -1,12 +1,12 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json.Serialization;
 using JetBrains.Annotations;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Resources;
 using JsonApiDotNetCore.Resources.Annotations;
 using JsonApiDotNetCore.Resources.Internal;
 using JsonApiDotNetCore.Serialization.Objects;
-using Newtonsoft.Json;
 
 namespace JsonApiDotNetCore.Serialization.Building
 {
@@ -168,15 +168,15 @@ private void ProcessAttributes(IIdentifiable resource, IEnumerable<AttrAttribute
             {
                 object value = attr.GetValue(resource);
 
-                if (_options.SerializerSettings.NullValueHandling == NullValueHandling.Ignore && value == null)
+                if (_options.SerializerOptions.DefaultIgnoreCondition == JsonIgnoreCondition.WhenWritingNull && value == null)
                 {
-                    return;
+                    continue;
                 }
 
-                if (_options.SerializerSettings.DefaultValueHandling == DefaultValueHandling.Ignore &&
+                if (_options.SerializerOptions.DefaultIgnoreCondition == JsonIgnoreCondition.WhenWritingDefault &&
                     Equals(value, RuntimeTypeConverter.GetDefaultValue(attr.Property.PropertyType)))
                 {
-                    return;
+                    continue;
                 }
 
                 ro.Attributes.Add(attr.PublicName, value);
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreValueTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreConditionTests.cs
similarity index 58%
rename from test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreValueTests.cs
rename to test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreConditionTests.cs
index b491605750..918578766f 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreValueTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/SerializerIgnoreConditionTests.cs
@@ -1,23 +1,23 @@
 using System.Linq;
 using System.Net;
 using System.Net.Http;
+using System.Text.Json.Serialization;
 using System.Threading.Tasks;
 using FluentAssertions;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
 using Microsoft.Extensions.DependencyInjection;
-using Newtonsoft.Json;
 using TestBuildingBlocks;
 using Xunit;
 
 namespace JsonApiDotNetCoreTests.IntegrationTests.QueryStrings
 {
-    public sealed class SerializerIgnoreValueTests : IClassFixture<IntegrationTestContext<TestableStartup<QueryStringDbContext>, QueryStringDbContext>>
+    public sealed class SerializerIgnoreConditionTests : IClassFixture<IntegrationTestContext<TestableStartup<QueryStringDbContext>, QueryStringDbContext>>
     {
         private readonly IntegrationTestContext<TestableStartup<QueryStringDbContext>, QueryStringDbContext> _testContext;
         private readonly QueryStringFakers _fakers = new();
 
-        public SerializerIgnoreValueTests(IntegrationTestContext<TestableStartup<QueryStringDbContext>, QueryStringDbContext> testContext)
+        public SerializerIgnoreConditionTests(IntegrationTestContext<TestableStartup<QueryStringDbContext>, QueryStringDbContext> testContext)
         {
             _testContext = testContext;
 
@@ -25,18 +25,22 @@ public SerializerIgnoreValueTests(IntegrationTestContext<TestableStartup<QuerySt
         }
 
         [Theory]
-        [InlineData(NullValueHandling.Ignore, false)]
-        [InlineData(NullValueHandling.Include, true)]
-        public async Task Applies_configuration_for_nulls(NullValueHandling configurationValue, bool expectInDocument)
+        [InlineData(JsonIgnoreCondition.Never, true, true)]
+        [InlineData(JsonIgnoreCondition.WhenWritingDefault, false, false)]
+        [InlineData(JsonIgnoreCondition.WhenWritingNull, false, true)]
+        public async Task Applies_configuration_for_ignore_condition(JsonIgnoreCondition configurationValue, bool expectNullValueInDocument,
+            bool expectDefaultValueInDocument)
         {
             // Arrange
             var options = (JsonApiOptions)_testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
-            options.SerializerSettings.NullValueHandling = configurationValue;
+            options.SerializerOptions.DefaultIgnoreCondition = configurationValue;
 
             Calendar calendar = _fakers.Calendar.Generate();
             calendar.TimeZone = null;
+            calendar.DefaultAppointmentDurationInMinutes = default;
             calendar.Appointments = _fakers.Appointment.Generate(1).ToHashSet();
             calendar.Appointments.Single().Title = null;
+            calendar.Appointments.Single().EndTime = default;
 
             await _testContext.RunOnDatabaseAsync(async dbContext =>
             {
@@ -55,7 +59,7 @@ await _testContext.RunOnDatabaseAsync(async dbContext =>
             responseDocument.SingleData.Should().NotBeNull();
             responseDocument.Included.Should().HaveCount(1);
 
-            if (expectInDocument)
+            if (expectNullValueInDocument)
             {
                 responseDocument.SingleData.Attributes.Should().ContainKey("timeZone");
                 responseDocument.Included[0].Attributes.Should().ContainKey("title");
@@ -65,40 +69,8 @@ await _testContext.RunOnDatabaseAsync(async dbContext =>
                 responseDocument.SingleData.Attributes.Should().NotContainKey("timeZone");
                 responseDocument.Included[0].Attributes.Should().NotContainKey("title");
             }
-        }
-
-        [Theory]
-        [InlineData(DefaultValueHandling.Ignore, false)]
-        [InlineData(DefaultValueHandling.Include, true)]
-        public async Task Applies_configuration_for_defaults(DefaultValueHandling configurationValue, bool expectInDocument)
-        {
-            // Arrange
-            var options = (JsonApiOptions)_testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
-            options.SerializerSettings.DefaultValueHandling = configurationValue;
-
-            Calendar calendar = _fakers.Calendar.Generate();
-            calendar.DefaultAppointmentDurationInMinutes = default;
-            calendar.Appointments = _fakers.Appointment.Generate(1).ToHashSet();
-            calendar.Appointments.Single().EndTime = default;
-
-            await _testContext.RunOnDatabaseAsync(async dbContext =>
-            {
-                dbContext.Calendars.Add(calendar);
-                await dbContext.SaveChangesAsync();
-            });
-
-            string route = $"/calendars/{calendar.StringId}?include=appointments";
-
-            // Act
-            (HttpResponseMessage httpResponse, Document responseDocument) = await _testContext.ExecuteGetAsync<Document>(route);
-
-            // Assert
-            httpResponse.Should().HaveStatusCode(HttpStatusCode.OK);
-
-            responseDocument.SingleData.Should().NotBeNull();
-            responseDocument.Included.Should().HaveCount(1);
 
-            if (expectInDocument)
+            if (expectDefaultValueInDocument)
             {
                 responseDocument.SingleData.Attributes.Should().ContainKey("defaultAppointmentDurationInMinutes");
                 responseDocument.Included[0].Attributes.Should().ContainKey("endTime");