diff --git a/countbits/csharp/CountBits.csproj b/countbits/csharp/CountBits.csproj
index 24907d6..7cb30e4 100644
--- a/countbits/csharp/CountBits.csproj
+++ b/countbits/csharp/CountBits.csproj
@@ -4,6 +4,6 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>
 </Project>
\ No newline at end of file