diff --git a/docker-compose.yml b/docker-compose.yml
index b34fffdfaa4..81bdd3c2032 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -37,7 +37,7 @@ services:
     ports:
       - "127.0.0.1:6379:6379"
   mongo:
-    image: circleci/mongo:4.0
+    image: circleci/mongo:3.6
     platform: linux/amd64
     ports:
       - "127.0.0.1:27017:27017"