diff --git a/line-pay-csharp/line-pay-csharp.csproj b/line-pay-csharp/line-pay-csharp.csproj
index 6085684..a4fd962 100644
--- a/line-pay-csharp/line-pay-csharp.csproj
+++ b/line-pay-csharp/line-pay-csharp.csproj
@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>
 
 </Project>