diff --git a/Directory.Packages.props b/Directory.Packages.props
index 4caf048c6..c42c172c8 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -62,7 +62,7 @@
 
   <!-- Testing dependencies -->
   <ItemGroup>
-    <PackageVersion Include="Anthropic" Version="12.17.0" />
+    <PackageVersion Include="Anthropic" Version="12.21.0" />
     <PackageVersion Include="coverlet.collector" Version="10.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>