diff --git a/outline/docker-compose.yaml b/outline/docker-compose.yaml
index 4ea80be..9cbdcb5 100644
--- a/outline/docker-compose.yaml
+++ b/outline/docker-compose.yaml
@@ -1,4 +1,3 @@
-version: "2"
 services:
   outline_redis:
     image: redis@sha256:7614ae9453d1d87e740a2056257a6de7135c84037c367e1fffa92ae922784631