diff --git a/config/shoryuken.yml b/config/shoryuken.yml
index 36b1555e2..f1568e885 100644
--- a/config/shoryuken.yml
+++ b/config/shoryuken.yml
@@ -1,4 +1,4 @@
-concurrency: 20
+concurrency: 15
 delay: 0
 pidfile: tmp/pids/shoryuken.pid
 queues: