diff --git a/global.json b/global.json
index 6ca92cf..4c8007c 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "7.0.102",
+    "version": "8.0.405",
     "rollForward": "latestFeature"
   }
 }
\ No newline at end of file
diff --git a/samples/ObjectAssertions.Sample/ObjectAssertions.Sample.csproj b/samples/ObjectAssertions.Sample/ObjectAssertions.Sample.csproj
index ec4d7fa..dea1281 100644
--- a/samples/ObjectAssertions.Sample/ObjectAssertions.Sample.csproj
+++ b/samples/ObjectAssertions.Sample/ObjectAssertions.Sample.csproj
@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>net7.0</TargetFramework>
+		<TargetFramework>net8.0</TargetFramework>
 		<Nullable>enable</Nullable>
 		<IsPackable>false</IsPackable>
+		<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
 	</PropertyGroup>
 
 	<!-- Generated files contains preview of files generted by source generator -->
diff --git a/samples/ObjectAssertions.Sample/Program.cs b/samples/ObjectAssertions.Sample/Program.cs
index 76e5e95..92bc4b6 100644
--- a/samples/ObjectAssertions.Sample/Program.cs
+++ b/samples/ObjectAssertions.Sample/Program.cs
@@ -1,4 +1,5 @@
 using ObjectAssertions.Abstractions;
+using System;
 using Xunit;
 using static ObjectAssertions.Sample.ObjectToAssert;
 
@@ -22,6 +23,9 @@ public record ObjectToAssert : Base
         public int? NullableNumber { get; set; } = 5;
         public NestedObject NestedObjectValue { get; set; } = new NestedObject();
 
+        [Obsolete]
+        public string ObsoleteValue { get; set; } = "I'm obsolete";
+
 
         public enum ExampleEnum { Option1, Option2, Option3 };
         public record NestedObject(int NestedInt = 5, string NestedString = "ubuaa");
@@ -58,6 +62,7 @@ public void HowTo()
                 IntegerNumber = i => Assert.Equal(30, i),
                 NullableNumber = n => Assert.Equal(5, n),
                 StringValue = s => Assert.Equal("Hello world", s),
+                ObsoleteValue = o => Assert.Equal("I'm obsolete", o), // Obsolete warnings are ignored in generated code
                 NestedObjectValue = n => new NestedObjectAssertions(n)
                 {
                     NestedInt = ObjectAssertionsHelpers.Ignore<int>("Out of test scope"),
diff --git a/src/ObjectAssertions.Abstractions/ObjectAssertions.Abstractions.csproj b/src/ObjectAssertions.Abstractions/ObjectAssertions.Abstractions.csproj
index bd1c243..6b29f56 100644
--- a/src/ObjectAssertions.Abstractions/ObjectAssertions.Abstractions.csproj
+++ b/src/ObjectAssertions.Abstractions/ObjectAssertions.Abstractions.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
 	  <IsPackable>true</IsPackable>
-	  <LangVersion>8</LangVersion>
+	  <LangVersion>11</LangVersion>
 	  <Nullable>enable</Nullable>
 
   </PropertyGroup>
diff --git a/src/ObjectAssertions/Generator/ClassGenerator.cs b/src/ObjectAssertions/Generator/ClassGenerator.cs
index 7908dbf..a44b96b 100644
--- a/src/ObjectAssertions/Generator/ClassGenerator.cs
+++ b/src/ObjectAssertions/Generator/ClassGenerator.cs
@@ -80,12 +80,14 @@ private string GenerateSource()
 
         private void GenerateAutogeneratedHeader(IndentedTextWriter sourceWriter)
         {
-            string header = @"
-                //------------------------------------------------------------------------------ 
-                // <auto-generated> 
-                // This code was generated by a source gnerator.
-                // </auto-generated> 
-                //------------------------------------------------------------------------------";
+            string header = """
+                        //------------------------------------------------------------------------------ 
+                        // <auto-generated> 
+                        // This code was generated by a source gnerator.
+                        // </auto-generated> 
+                        //------------------------------------------------------------------------------
+                        #pragma warning disable CS0612
+                        """;
             sourceWriter.WriteLine(header);
         }
 
diff --git a/src/ObjectAssertions/ObjectAssertions.csproj b/src/ObjectAssertions/ObjectAssertions.csproj
index 410e200..36cb2c4 100644
--- a/src/ObjectAssertions/ObjectAssertions.csproj
+++ b/src/ObjectAssertions/ObjectAssertions.csproj
@@ -5,7 +5,7 @@
     <Nullable>enable</Nullable>
 	<IsRoslynComponent>true</IsRoslynComponent>
 	  <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
-	<LangVersion>9</LangVersion>
+	<LangVersion>11</LangVersion>
   </PropertyGroup>
 	<PropertyGroup>
 		<Version>0.0.0-preview1</Version>