diff --git a/MCPSharp.Example/MCPSharp.Example.csproj b/MCPSharp.Example/MCPSharp.Example.csproj
index 8be016e..876794c 100644
--- a/MCPSharp.Example/MCPSharp.Example.csproj
+++ b/MCPSharp.Example/MCPSharp.Example.csproj
@@ -30,7 +30,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Formats.Asn1" Version="9.0.6" />
+    <PackageReference Include="System.Formats.Asn1" Version="9.0.9" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/MCPSharp.ExternalExample/MCPSharp.Example.Import.csproj b/MCPSharp.ExternalExample/MCPSharp.Example.Import.csproj
index 9f3789b..1129c22 100644
--- a/MCPSharp.ExternalExample/MCPSharp.Example.Import.csproj
+++ b/MCPSharp.ExternalExample/MCPSharp.Example.Import.csproj
@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="System.Formats.Asn1" Version="9.0.9" />
     <ProjectReference Include="..\MCPSharp\MCPSharp.csproj" />
   </ItemGroup>
 
diff --git a/MCPSharp/MCPSharp.csproj b/MCPSharp/MCPSharp.csproj
index f5718da..89ebac7 100644
--- a/MCPSharp/MCPSharp.csproj
+++ b/MCPSharp/MCPSharp.csproj
@@ -91,6 +91,7 @@ await client.CallToolAsync("echo", new Dictionary&lt;string, object&gt;{{"input"
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="System.Formats.Asn1" Version="9.0.9" />
 	  <None Include="icon.png" Pack="true" PackagePath="\">
 		  <CopyToOutputDirectory>Always</CopyToOutputDirectory>
 	  </None>