diff --git a/tetsujin/OAuthProvider/OAuthProvider.csproj b/tetsujin/OAuthProvider/OAuthProvider.csproj
index c7c1845..ca0e25d 100644
--- a/tetsujin/OAuthProvider/OAuthProvider.csproj
+++ b/tetsujin/OAuthProvider/OAuthProvider.csproj
@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
 
 </Project>