diff --git a/tools/testing-tool/TestingTool.AppHost/TestingTool.AppHost.csproj b/tools/testing-tool/TestingTool.AppHost/TestingTool.AppHost.csproj
index 36bc67fa14..16769d8545 100644
--- a/tools/testing-tool/TestingTool.AppHost/TestingTool.AppHost.csproj
+++ b/tools/testing-tool/TestingTool.AppHost/TestingTool.AppHost.csproj
@@ -20,6 +20,7 @@
   </ItemGroup>
 
   <ItemGroup Label="Direct references to transitive dependencies to avoid versions with CVE">
+    <PackageReference Include="MessagePack" Version="2.5.303" />
     <PackageReference Include="System.Security.Cryptography.Pkcs" Version="10.0.13" />
   </ItemGroup>