diff --git a/playbooks/groups/copr-backend.yml b/playbooks/groups/copr-backend.yml
index a1dbcacff7..47d25d4749 100644
--- a/playbooks/groups/copr-backend.yml
+++ b/playbooks/groups/copr-backend.yml
@@ -3,6 +3,7 @@
   hosts: copr-back:copr-back-stg
   user: root
   gather_facts: False
+  serial: 1
 
   vars_files:
    - /srv/web/infra/ansible/vars/global.yml