diff --git a/Directory.Packages.props b/Directory.Packages.props
index df615b1..a4c7f3a 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -14,7 +14,7 @@
 
     <!-- Serialization -->
     <!-- Keep the 2.x line until a 3.x migration is tested. Use 2.5.301 or later on 2.x; 2.5.192 and earlier carry GHSA-4qm4-8hg2-g2xm. -->
-    <PackageVersion Include="MessagePack" Version="2.5.301" />
+    <PackageVersion Include="MessagePack" Version="2.5.303" />
 
     <!-- ASP.NET Core and OpenAPI -->
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.12" />