diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index f118237..c78af02 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -1,3 +1,4 @@
+version: '3'
 services:
   app:
     image: ghcr.io/writefreely/writefreely:latest