diff --git a/dotnet/Directory.Packages.props b/dotnet/Directory.Packages.props
index bf3ff94eba..3a85c615b7 100644
--- a/dotnet/Directory.Packages.props
+++ b/dotnet/Directory.Packages.props
@@ -7,33 +7,33 @@
- 9.5.2
+ 13.0.0
-
+
-
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-
+
-
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-
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+
-
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@@ -46,27 +46,27 @@
-
-
+
+
-
-
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@@ -101,7 +101,7 @@
-
+
@@ -115,7 +115,7 @@
-
+
all
runtime; build; native; contentfiles; analyzers; buildtransitive
diff --git a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/ChatCompletions/Models/Tool.cs b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/ChatCompletions/Models/Tool.cs
index 87b0637b9b..412494eeaa 100644
--- a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/ChatCompletions/Models/Tool.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/ChatCompletions/Models/Tool.cs
@@ -160,5 +160,5 @@ internal sealed record CustomToolFormat
/// Additional format properties (schema definition).
///
[JsonExtensionData]
- public Dictionary? AdditionalProperties { get; init; }
+ public Dictionary? AdditionalProperties { get; set; }
}