diff --git a/Chapter04/FastExtractDocumentMetadata/ContractExtractor/ContractExtractor.csproj b/Chapter04/FastExtractDocumentMetadata/ContractExtractor/ContractExtractor.csproj
index 0017fbb..42950df 100644
--- a/Chapter04/FastExtractDocumentMetadata/ContractExtractor/ContractExtractor.csproj
+++ b/Chapter04/FastExtractDocumentMetadata/ContractExtractor/ContractExtractor.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="NPOI" Version="2.4.1" />
   </ItemGroup>