diff --git a/administration-guide/installation.md b/administration-guide/installation.md
index 81bd0f9..df74c9d 100644
--- a/administration-guide/installation.md
+++ b/administration-guide/installation.md
@@ -121,6 +121,7 @@ Semaphore will be available via this URL [https://localhost:3000](https://localh
  Create a `docker-compose.yml` file with following content:
 
 ```yaml
+version: "3"
 services:
   # uncomment this section and comment out the mysql section to use postgres instead of mysql
   #postgres: