diff --git a/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/BotSharp.Plugin.MicrosoftExtensionsAI.csproj b/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/BotSharp.Plugin.MicrosoftExtensionsAI.csproj
index 9ce69188..66a9a1d9 100644
--- a/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/BotSharp.Plugin.MicrosoftExtensionsAI.csproj
+++ b/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/BotSharp.Plugin.MicrosoftExtensionsAI.csproj
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.0.1-preview.1.24570.5" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.1.0-preview.1.25064.3" />
     <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
   </ItemGroup>
 
diff --git a/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/MicrosoftExtensionsAIChatCompletionProvider.cs b/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/MicrosoftExtensionsAIChatCompletionProvider.cs
index 37869050..67f1e513 100644
--- a/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/MicrosoftExtensionsAIChatCompletionProvider.cs
+++ b/src/Plugins/BotSharp.Plugin.MicrosoftExtensionsAI/MicrosoftExtensionsAIChatCompletionProvider.cs
@@ -66,8 +66,7 @@ public sealed class MicrosoftExtensionsAIChatCompletionProvider : IChatCompletio
 
         if (_services.GetService<IAgentService>() is { } agentService)
         {
-            var functions = agent.Functions.Concat(agent.SecondaryFunctions ?? []);
-            foreach (var function in functions)
+            foreach (var function in agent.Functions)
             {
                 if (agentService.RenderFunction(agent, function))
                 {