diff --git a/postgres-backup-s3/integration-tests.test.yml b/postgres-backup-s3/integration-tests.test.yml
index 2201b2b..a70b342 100644
--- a/postgres-backup-s3/integration-tests.test.yml
+++ b/postgres-backup-s3/integration-tests.test.yml
@@ -1,4 +1,4 @@
-version: '3.7'
+version: '3.6'
 services:
   postgres:
     image: camptocamp/postgres:9.6