diff --git a/docker-compose.yml.example b/docker-compose.yml.example
index eeb98ad..15e549d 100755
--- a/docker-compose.yml.example
+++ b/docker-compose.yml.example
@@ -1,4 +1,4 @@
-version: '3.6'
+version: '3.9'
 
 services:
   nginx: