diff --git a/.github/workflows/dotnet-codeql.yml b/.github/workflows/dotnet-codeql.yml
index ed0d191..ba9dc56 100644
--- a/.github/workflows/dotnet-codeql.yml
+++ b/.github/workflows/dotnet-codeql.yml
@@ -36,8 +36,8 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          6.0.x
           7.0.x
+          8.0.x
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 3aaf2f8..d683200 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -6,7 +6,7 @@ on:
   pull_request:
     branches: [ main ]
   release:
-    types: [ published ]    
+    types: [ published ]
 
 jobs:
   build:
@@ -18,8 +18,8 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          6.0.x
           7.0.x
+          8.0.x
 
     - name: Install dependencies
       run: dotnet restore
diff --git a/Directory.Build.props b/Directory.Build.props
index e44f3fe..21f6da9 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,8 +1,8 @@
 <Project>
   <PropertyGroup Label="Frameworks">
-    <ClassLibTargetFrameworks>netstandard2.0;net7.0</ClassLibTargetFrameworks>
-    <TestTargetFrameworks>net6.0;net7.0</TestTargetFrameworks>
-    <SampleTargetFramework>net7.0</SampleTargetFramework>
+    <ClassLibTargetFrameworks>net7.0;net8.0</ClassLibTargetFrameworks>
+    <TestTargetFrameworks>net7.0;net8.0</TestTargetFrameworks>
+    <SampleTargetFramework>net8.0</SampleTargetFramework>
 
     <!-- Unit tests are running against EOL SDKs as well. Disable all warnings related to EOL SDK -->
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
@@ -10,6 +10,8 @@
 
     <!-- Suppress warnings related to preview SDKs -->
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
+
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup Label="Versions">
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 3fa8832..06e540d 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -5,10 +5,6 @@
   
   <!-- Run "dotnet list package (dash,dash)outdated" to see the latest versions of each package.-->
 	
-  <ItemGroup Label="Package Dependencies">
-    <PackageVersion Include="System.Text.Json" Version="8.0.0" Condition="'$(TargetFramework)' != 'netcoreapp3.1' OR '$(TargetFramework)'== 'net5.0' OR '$(TargetFramework)' != 'net6.0'"/>
-  </ItemGroup>
-
   <ItemGroup Label="Build Dependencies">
     <PackageVersion Include="coverlet.collector" Version="6.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
diff --git a/sample/WeatherForecastWebApi/Controllers/WeatherForecastController.cs b/sample/WeatherForecastWebApi/Controllers/WeatherForecastController.cs
index 0648880..87cbe4d 100644
--- a/sample/WeatherForecastWebApi/Controllers/WeatherForecastController.cs
+++ b/sample/WeatherForecastWebApi/Controllers/WeatherForecastController.cs
@@ -6,10 +6,7 @@ namespace WeatherForecastWebApi.Controllers;
 [Route("[controller]")]
 public class WeatherForecastController : ControllerBase
 {
-    private static readonly string[] Summaries = new[]
-    {
-        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-    };
+    private static readonly string[] Summaries = ["Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"];
 
     public WeatherForecastController()
     {
diff --git a/src/ZCS.DataContractResolver/DataContractResolver.cs b/src/ZCS.DataContractResolver/DataContractResolver.cs
index e43e0f0..e642e2b 100644
--- a/src/ZCS.DataContractResolver/DataContractResolver.cs
+++ b/src/ZCS.DataContractResolver/DataContractResolver.cs
@@ -40,13 +40,7 @@ private static bool IsNullOrDefault(object obj)
                 return false;
             }
 
-#if NET5_0_OR_GREATER
-            return RuntimeHelpers
-#else
-            return FormatterServices
-#endif
-                .GetUninitializedObject(type)
-                .Equals(obj);
+            return RuntimeHelpers.GetUninitializedObject(type).Equals(obj);
         }
 
         private static IEnumerable<MemberInfo> EnumerateFieldsAndProperties(Type type, BindingFlags bindingFlags)
diff --git a/test/ZCS.DataContractResolver.Tests/DataContractResolverTests.cs b/test/ZCS.DataContractResolver.Tests/DataContractResolverTests.cs
index 0c5f229..74d4512 100644
--- a/test/ZCS.DataContractResolver.Tests/DataContractResolverTests.cs
+++ b/test/ZCS.DataContractResolver.Tests/DataContractResolverTests.cs
@@ -20,15 +20,10 @@ public class Person
         public int Age;
     }
 
-    public class PersonWithoutDefaultConstructor
+    public class PersonWithoutDefaultConstructor(string fullName, int age)
     {
-        public PersonWithoutDefaultConstructor(string fullName, int age)
-        {
-            FullName = fullName;
-            Age = age;
-        }
-        public string FullName { get; }
-        public int Age { get; }
+        public string FullName { get; } = fullName;
+        public int Age { get; } = age;
     }
 
     public class PersonWithNonPublicMember
@@ -272,15 +267,10 @@ public class Generic<T>
     }
 
     [DataContract]
-    public class GenericWithConstructor<T>
+    public class GenericWithConstructor<T>(T value)
     {
-        public GenericWithConstructor(T value)
-        {
-            Value = value;
-        }
-
         [DataMember]
-        public T Value { get; private set; }
+        public T Value { get; private set; } = value;
     }
 
     public class DataContractResolverTests
@@ -303,23 +293,23 @@ private static System.Collections.IEnumerable TestCases()
                 yield return new TestCaseData(ignoreCondition, (byte)1);
                 yield return new TestCaseData(ignoreCondition, (sbyte)-1);
 
-                yield return new TestCaseData(ignoreCondition, Int16.MinValue);
-                yield return new TestCaseData(ignoreCondition, Int16.MaxValue);
+                yield return new TestCaseData(ignoreCondition, short.MinValue);
+                yield return new TestCaseData(ignoreCondition, short.MaxValue);
 
-                yield return new TestCaseData(ignoreCondition, Int32.MinValue);
-                yield return new TestCaseData(ignoreCondition, Int32.MaxValue);
+                yield return new TestCaseData(ignoreCondition, int.MinValue);
+                yield return new TestCaseData(ignoreCondition, int.MaxValue);
 
-                yield return new TestCaseData(ignoreCondition, Int64.MinValue);
+                yield return new TestCaseData(ignoreCondition, long.MinValue);
                 yield return new TestCaseData(ignoreCondition, Int64.MaxValue);
 
-                yield return new TestCaseData(ignoreCondition, UInt16.MinValue);
-                yield return new TestCaseData(ignoreCondition, UInt16.MaxValue);
+                yield return new TestCaseData(ignoreCondition, ushort.MinValue);
+                yield return new TestCaseData(ignoreCondition, ushort.MaxValue);
 
-                yield return new TestCaseData(ignoreCondition, UInt32.MinValue);
-                yield return new TestCaseData(ignoreCondition, UInt32.MaxValue);
+                yield return new TestCaseData(ignoreCondition, uint.MinValue);
+                yield return new TestCaseData(ignoreCondition, uint.MaxValue);
 
-                yield return new TestCaseData(ignoreCondition, UInt64.MinValue);
-                yield return new TestCaseData(ignoreCondition, UInt64.MaxValue);
+                yield return new TestCaseData(ignoreCondition, ulong.MinValue);
+                yield return new TestCaseData(ignoreCondition, ulong.MaxValue);
 
                 yield return new TestCaseData(ignoreCondition, 1.2m);
 
@@ -341,20 +331,20 @@ private static System.Collections.IEnumerable TestCases()
                 yield return new TestCaseData(ignoreCondition, new KeyValuePair<string, string>("1", "2"));
 
                 yield return new TestCaseData(ignoreCondition, new List<int>());
-                yield return new TestCaseData(ignoreCondition, new List<int> { 0, 1, 2, 3 });
-                yield return new TestCaseData(ignoreCondition, new List<string> { "0", "1", "2", "3" });
+                yield return new TestCaseData(ignoreCondition, (List<int>)[0, 1, 2, 3]);
+                yield return new TestCaseData(ignoreCondition, (List<string>)["0", "1", "2", "3"]);
 
-                yield return new TestCaseData(ignoreCondition, new int[0]);
-                yield return new TestCaseData(ignoreCondition, new int[] { 0, 1, 2, 3 });
-                yield return new TestCaseData(ignoreCondition, new string[] { "0", "1", "2", "3" });
+                yield return new TestCaseData(ignoreCondition, Array.Empty<int>());
+                yield return new TestCaseData(ignoreCondition, (int[])[0, 1, 2, 3]);
+                yield return new TestCaseData(ignoreCondition, (string[])["0", "1", "2", "3"]);
 
                 yield return new TestCaseData(ignoreCondition, new Dictionary<int, int> { { 1, 2 }, { 3, 4 } });
                 yield return new TestCaseData(ignoreCondition, new Dictionary<int, string> { { 1, "2" }, { 3, "4" } });
                 yield return new TestCaseData(ignoreCondition, new Dictionary<string, string> { { "1", "2" }, { "3", "4" } });
 
                 yield return new TestCaseData(ignoreCondition, new HashSet<int>());
-                yield return new TestCaseData(ignoreCondition, new HashSet<int> { 0, 1, 2, 3 });
-                yield return new TestCaseData(ignoreCondition, new HashSet<string> { "0", "1", "2", "3" });
+                yield return new TestCaseData(ignoreCondition, (HashSet<int>)[0, 1, 2, 3]);
+                yield return new TestCaseData(ignoreCondition, (HashSet<string>)["0", "1", "2", "3"]);
 
                 yield return new TestCaseData(ignoreCondition, new Generic<int>{ Value = 1 });
                 yield return new TestCaseData(ignoreCondition, new Generic<string> { Value = "1" });
@@ -427,22 +417,22 @@ private static System.Collections.IEnumerable TestCases()
                 yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe" });
                 yield return new TestCaseData(ignoreCondition, new PersonWithList() { Age = 21 });
                 yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe", Age = 21 });
-                yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe", Age = 21, Friends = new List<Person> { new Person() { FullName = "John Doe", Age = 21 } } });
-                yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe", Age = 21, List = new List<int> { 0, 1, 2, 3, 4 } });
+                yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe", Age = 21, Friends = [new() { FullName = "John Doe", Age = 21 }] });
+                yield return new TestCaseData(ignoreCondition, new PersonWithList() { FullName = "John Doe", Age = 21, List = [0, 1, 2, 3, 4] });
 
                 yield return new TestCaseData(ignoreCondition, new PersonWithSet());
                 yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe" });
                 yield return new TestCaseData(ignoreCondition, new PersonWithSet() { Age = 21 });
                 yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe", Age = 21 });
-                yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe", Age = 21, Friends = new HashSet<Person> { new Person() { FullName = "John Doe", Age = 21 }, new Person() { FullName = "James Doe", Age = 22 } } });
-                yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe", Age = 21, Set = new HashSet<int> { 0, 1, 2, 3, 4 } });
+                yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe", Age = 21, Friends = [new() { FullName = "John Doe", Age = 21 }, new() { FullName = "James Doe", Age = 22 }] });
+                yield return new TestCaseData(ignoreCondition, new PersonWithSet() { FullName = "John Doe", Age = 21, Set = [0, 1, 2, 3, 4] });
 
                 yield return new TestCaseData(ignoreCondition, new PersonWithArray());
                 yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe" });
                 yield return new TestCaseData(ignoreCondition, new PersonWithArray() { Age = 21 });
                 yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe", Age = 21 });
-                yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe", Age = 21, Friends = new Person[] { new Person() { FullName = "John Doe", Age = 21 }, new Person() { FullName = "James Doe", Age = 22 } } });
-                yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe", Age = 21, Array = new int[] { 0, 1, 2, 3, 4 } });
+                yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe", Age = 21, Friends = [new() { FullName = "John Doe", Age = 21 }, new() { FullName = "James Doe", Age = 22 }] });
+                yield return new TestCaseData(ignoreCondition, new PersonWithArray() { FullName = "John Doe", Age = 21, Array = [0, 1, 2, 3, 4] });
 
                 yield return new TestCaseData(ignoreCondition, new PersonContractWithIgnore());
                 yield return new TestCaseData(ignoreCondition, new PersonContractWithIgnore() { FullName = "John Doe" });