diff --git a/executor/src/main/resources/application.yml.example b/executor/src/main/resources/application.yml.example
index b82de5c..1a4d3df 100644
--- a/executor/src/main/resources/application.yml.example
+++ b/executor/src/main/resources/application.yml.example
@@ -28,7 +28,7 @@ spring:
       topic_email: topic-gitlink-email
       topic_new_email_remind: topic-gitlink-new-email-remind
     listener:
-      concurrency: 3
+      concurrency: 1
       ack-mode: record
 
   redis: