diff --git a/docker/acme-dns.yaml b/docker/acme-dns.yaml
index 32dc01a..76cf3b0 100644
--- a/docker/acme-dns.yaml
+++ b/docker/acme-dns.yaml
@@ -1,12 +1,11 @@
-version: '3'
-services:
-  acmedns:
-    image: joohoi/acme-dns:latest
-    ports:
-      - "443:443"
-      - "53:53"
-      - "53:53/udp"
-      - "80:80"
-    volumes:
-      - /opt/acme-dns/config:/etc/acme-dns:ro
-      - /opt/acme-dns/data:/var/lib/acme-dns
+acmedns:
+  image: joohoi/acme-dns:latest
+  ports:
+    - "443:443"
+    - "53:53"
+    - "53:53/udp"
+    - "80:80"
+  volumes:
+    - /opt/acme-dns/config:/etc/acme-dns:ro
+    - /opt/acme-dns/data:/var/lib/acme-dns
+