diff --git a/samples/csharp_dotnetcore/84.bot-authentication-certificate/Bots/AuthCertificateBot.cs b/samples/csharp_dotnetcore/84.bot-authentication-certificate/Bots/AuthCertificateBot.cs
index 62d5b75a5e..ac8174c883 100644
--- a/samples/csharp_dotnetcore/84.bot-authentication-certificate/Bots/AuthCertificateBot.cs
+++ b/samples/csharp_dotnetcore/84.bot-authentication-certificate/Bots/AuthCertificateBot.cs
@@ -5,9 +5,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Bot.Builder;
-using Microsoft.Bot.Builder.Dialogs;
 using Microsoft.Bot.Schema;
-using Microsoft.Extensions.Logging;
 
 namespace Microsoft.BotBuilderSamples
 {