diff --git a/docker-compose.yml b/docker-compose.yml
index 4379405..6fe2036 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,3 @@
-version: '3.1'
 services:
   redmine:
     image: redmine:4.x-toggl2redmine