diff --git a/src/csharp/ChatClient.cs b/src/csharp/ChatClient.cs
index 753ec8d5d..d47c3275b 100644
--- a/src/csharp/ChatClient.cs
+++ b/src/csharp/ChatClient.cs
@@ -183,10 +183,12 @@ public async IAsyncEnumerable<StreamingChatCompletionUpdate> CompleteStreamingAs
     }
 
     /// <inheritdoc/>
-    public TService GetService<TService>(object key = null) where TService : class =>
-        typeof(TService) == typeof(Model) ? (TService)(object)_model :
-        typeof(TService) == typeof(Tokenizer) ? (TService)(object)_tokenizer :
-        this as TService;
+    public object GetService(Type serviceType, object key = null) =>
+        key is not null ? null :
+        serviceType == typeof(Model) ? _model :
+        serviceType == typeof(Tokenizer) ? _tokenizer :
+        serviceType?.IsInstanceOfType(this) is true ? this :
+        null;
 
     /// <summary>Gets whether the specified token is a stop sequence.</summary>
     private bool IsStop(string token, ChatOptions options) =>
diff --git a/src/csharp/Microsoft.ML.OnnxRuntimeGenAI.csproj b/src/csharp/Microsoft.ML.OnnxRuntimeGenAI.csproj
index b6e838adb..83f729a7e 100644
--- a/src/csharp/Microsoft.ML.OnnxRuntimeGenAI.csproj
+++ b/src/csharp/Microsoft.ML.OnnxRuntimeGenAI.csproj
@@ -122,7 +122,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.0.0-preview.9.24525.1" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.0.1-preview.1.24570.5" />
   </ItemGroup>
 
 </Project>