diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ea50df9..26a97d1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: ['windows-2019', 'ubuntu-20.04']
+        os: ['windows-latest', 'ubuntu-latest']
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout
@@ -24,6 +24,7 @@ jobs:
       uses: actions/setup-dotnet@v2
       with:
         dotnet-version: |
+          9.0.x
           7.0.100
           6.0.x
 
diff --git a/global.json b/global.json
index 77c776f..cdbb589 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "7.0.100",
+    "version": "9.0.100",
     "rollForward": "latestFeature"
   }
 }
diff --git a/src/FluentValidation.AspNetCore/FluentValidationModelValidatorProvider.cs b/src/FluentValidation.AspNetCore/FluentValidationModelValidatorProvider.cs
index 7cb53dc..95f6dd4 100644
--- a/src/FluentValidation.AspNetCore/FluentValidationModelValidatorProvider.cs
+++ b/src/FluentValidation.AspNetCore/FluentValidationModelValidatorProvider.cs
@@ -133,9 +133,13 @@ public virtual IEnumerable<ModelValidationResult> Validate(ModelValidationContex
 
 			IValidationContext context = new ValidationContext<object>(mvContext.Model, new PropertyChain(), selector);
 			context.RootContextData["InvokedByMvc"] = true;
-#pragma warning disable CS0618
-			context.SetServiceProvider(mvContext.ActionContext.HttpContext.RequestServices);
-#pragma warning restore CS0618
+
+			// For backwards compatibility, store the service provider in the validation context.
+			// This approach works with both FluentValidation.DependencyInjectionExtensions 11.x
+			// and FluentValidation.DependencyInjectionExtensions 12.x.
+			// Do not use context.SetServiceProvider extension method as this no longer
+			// exists in 12.x.
+			context.RootContextData["_FV_ServiceProvider"] = mvContext.ActionContext.HttpContext.RequestServices;
 
 			if (interceptor != null) {
 				// Allow the user to provide a customized context
diff --git a/src/FluentValidation.Tests.AspNetCore/DependencyInjectionTests.cs b/src/FluentValidation.Tests.AspNetCore/DependencyInjectionTests.cs
index 54c6eda..e8e159c 100644
--- a/src/FluentValidation.Tests.AspNetCore/DependencyInjectionTests.cs
+++ b/src/FluentValidation.Tests.AspNetCore/DependencyInjectionTests.cs
@@ -12,6 +12,7 @@ namespace FluentValidation.Tests;
 
 #pragma warning disable CS0618
 
+#if !NET9_0
 public class DependencyInjectionTests : IClassFixture<WebAppFixture> {
 	private readonly ITestOutputHelper _output;
 	private readonly HttpClient _client;
@@ -51,3 +52,4 @@ public async Task Resolves_explicit_child_validator_for_collection() {
 		result.GetError("Children[0].Name").ShouldEqual("NotNullInjected");
 	}
 }
+#endif
diff --git a/src/FluentValidation.Tests.AspNetCore/FluentValidation.Tests.AspNetCore.csproj b/src/FluentValidation.Tests.AspNetCore/FluentValidation.Tests.AspNetCore.csproj
index 3788895..c107c8a 100644
--- a/src/FluentValidation.Tests.AspNetCore/FluentValidation.Tests.AspNetCore.csproj
+++ b/src/FluentValidation.Tests.AspNetCore/FluentValidation.Tests.AspNetCore.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net9.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <RootNamespace>FluentValidation.Tests</RootNamespace>
     <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
@@ -25,6 +25,13 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="7.0.0" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)'=='net9.0'">
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="9.0.0" />
+    <!-- For .net 9 builds also target FV 12 -->
+    <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.0.0" />
+    <PackageReference Include="FluentValidation" Version="12.0.0" />
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\FluentValidation.AspNetCore\FluentValidation.AspNetCore.csproj" />
   </ItemGroup>
diff --git a/src/FluentValidation.Tests.AspNetCore/TestModels.cs b/src/FluentValidation.Tests.AspNetCore/TestModels.cs
index d76b6a6..77854e1 100644
--- a/src/FluentValidation.Tests.AspNetCore/TestModels.cs
+++ b/src/FluentValidation.Tests.AspNetCore/TestModels.cs
@@ -422,6 +422,7 @@ public class ChildModel7 {
 	public string Name { get; set; }
 }
 
+#if !NET9_0
 public class InjectsExplicitChildValidator : AbstractValidator<ParentModel> {
 	public InjectsExplicitChildValidator() {
 #pragma warning disable CS0618
@@ -443,6 +444,7 @@ public InjectsExplicitChildValidatorCollection() {
 #pragma warning restore CS0618
 	}
 }
+#endif
 
 public class BadAsyncModel {
 	public int Id { get; set; }
diff --git a/src/FluentValidation.Tests.AspNetCore/TypeFilterTests.cs b/src/FluentValidation.Tests.AspNetCore/TypeFilterTests.cs
index 7f68f58..9556562 100644
--- a/src/FluentValidation.Tests.AspNetCore/TypeFilterTests.cs
+++ b/src/FluentValidation.Tests.AspNetCore/TypeFilterTests.cs
@@ -42,10 +42,10 @@ public async Task Finds_and_executes_validator() {
 				fv.RegisterValidatorsFromAssemblyContaining<TestController>();
 			});
 		});
-		var result = await client.GetErrors("InjectsExplicitChildValidator");
+		var result = await client.GetErrors("Test1");
 
 		// Validator was found and executed so field shouldn't be valid.
-		result.IsValidField("Child.Name").ShouldBeFalse();
+		result.IsValidField("Name").ShouldBeFalse();
 
 	}
 
@@ -54,14 +54,14 @@ public async Task Filters_types() {
 		var client = _webApp.CreateClientWithServices(services => {
 			services.AddMvc().AddNewtonsoftJson().AddFluentValidation(fv => {
 				fv.RegisterValidatorsFromAssemblyContaining<TestController>(scanResult => {
-					return scanResult.ValidatorType != typeof(InjectsExplicitChildValidator);
+					return scanResult.ValidatorType != typeof(TestModelValidator);
 				});
 			});
 		});
 
-		var result = await client.GetErrors("InjectsExplicitChildValidator");
+		var result = await client.GetErrors("Test1");
 
 		// Should be valid as the validator was skipped.
-		result.IsValidField("Child.Name").ShouldBeTrue();
+		result.IsValidField("Name").ShouldBeTrue();
 	}
 }