diff --git a/docker-compose.http.yml b/docker-compose.http.yml
index 40d1f80..c187b55 100644
--- a/docker-compose.http.yml
+++ b/docker-compose.http.yml
@@ -1,4 +1,4 @@
-version: "3.7"
+version: "3.5"
 
 networks:
   default:
diff --git a/docker-compose.yml b/docker-compose.yml
index bde980f..909e750 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3.7"
+version: "3.5"
 
 #
 # This docker compose needs .env file.
diff --git a/docs/dind/docker-compose.yml b/docs/dind/docker-compose.yml
index 94cb6d8..374408e 100644
--- a/docs/dind/docker-compose.yml
+++ b/docs/dind/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3"
+version: "3.5"
 
 services:
   neko-rooms:
diff --git a/docs/nginx/docker-compose.yml b/docs/nginx/docker-compose.yml
index 2cc6bd4..7689b18 100644
--- a/docs/nginx/docker-compose.yml
+++ b/docs/nginx/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3.7"
+version: "3.5"
 
 networks:
   default: