diff --git a/tests/playbook.yml b/tests/playbook.yml
index c036ee9ff7cd66ffde35180596f4b5a4c96d8998..3c206ebb903274bea4c9df0899d1aef90ed9f1f3 100644
--- a/tests/playbook.yml
+++ b/tests/playbook.yml
@@ -29,7 +29,7 @@
             state: started
 
 - hosts: all
-  strategy: free
+  serial: 1
   roles:
     - role: adarnimrod.nginx
     - role: pelican-gitreceive