diff --git a/config/sidekiq.yml b/config/sidekiq.yml
index 00c83827..dd8375ee 100644
--- a/config/sidekiq.yml
+++ b/config/sidekiq.yml
@@ -1,3 +1,4 @@
+:concurrency: 1
 :logfile: log/sidekiq.log
 :max_retries: 0
 :schedule: