diff --git a/docker-compose.yml b/docker-compose.yml
index 2b0f3b9..851b408 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,5 @@
 # https://docs.docker.com/compose/compose-file/compose-file-v3/
 ---
-version: "3.9"
 services:
   caddy:
     image: caddy:${TAG:-alpine}