diff --git a/CHANGELOG.md b/CHANGELOG.md
index e96d4eb..3ef879a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Bugfix] Fix Mongodb compatibility version upgrade when upgrading from Koa to Lilac.
+
 ## v12.1.2 (2021-09-18)
 
 - [Bugfix] Fix (agin) forum starting issue: "NoMethodError: undefined method 'encode' for nil:NilClass".
diff --git a/tutor/commands/local.py b/tutor/commands/local.py
index c6adf7a..ce3b041 100644
--- a/tutor/commands/local.py
+++ b/tutor/commands/local.py
@@ -1,4 +1,5 @@
 import os
+from time import sleep
 
 import click
 
@@ -198,6 +199,8 @@ def upgrade_mongodb(
     config["DOCKER_IMAGE_MONGODB"] = "mongo:{}".format(to_docker_version)
     tutor_env.save(context.obj.root, config)
     context.invoke(compose.start, detach=True, services=["mongodb"])
+    fmt.echo_info("Waiting for mongodb to boot...")
+    sleep(10)
     context.invoke(
         compose.execute,
         args=[