diff --git a/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/InboxProcessor.cs b/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/InboxProcessor.cs
index f381ca9644..4d071485cc 100644
--- a/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/InboxProcessor.cs
+++ b/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/InboxProcessor.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
-using Medallion.Threading;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
diff --git a/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/OutboxSender.cs b/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/OutboxSender.cs
index e9e65118a3..eb82b3cf18 100644
--- a/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/OutboxSender.cs
+++ b/framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/OutboxSender.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
-using Medallion.Threading;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;