diff --git a/dc3/docker-compose.yml b/dc3/docker-compose.yml
index d5b0bf0..4cc9b15 100644
--- a/dc3/docker-compose.yml
+++ b/dc3/docker-compose.yml
@@ -1,4 +1,4 @@
-version: '3.7'
+version: '3.3'
 
 services:
   web: