diff --git a/docker-compose-operation.yml b/docker-compose-operation.yml
index 09ca045cc..02ddedfea 100644
--- a/docker-compose-operation.yml
+++ b/docker-compose-operation.yml
@@ -1,3 +1,5 @@
+version: '2.3'
+
 services:
   files:
     container_name: "themotte"