diff --git a/templates/docker-compose.yml.j2 b/templates/docker-compose.yml.j2
index 51b00d0..34a5ca2 100644
--- a/templates/docker-compose.yml.j2
+++ b/templates/docker-compose.yml.j2
@@ -29,7 +29,7 @@ services:
       - "traefik.frontend.rule=Host: your.domain.tld"
 
   mongo:
-    image: mongo:4.0
+    image: mongo:{{ mongo_version }}
     restart: unless-stopped
     volumes:
       - ./data/db:/data/db
@@ -52,7 +52,7 @@ services:
       - ./data/db:/data/db
 
   mongo-init-replica:
-    image: mongo:4.0
+    image: mongo:{{ mongo_version }}
     command: >
       bash -c
         "for (( ; ; )); do