# \[SOLVED\] Trying to update mongodb from 3.2 to 4.0 in Docker but errors

**URL:** <https://forums.rocket.chat/t/solved-trying-to-update-mongodb-from-3-2-to-4-0-in-docker-but-errors/3200>\
**Category:** Community Support\
**Created:** [February 14, 2019, 10:55am UTC](https://forums.rocket.chat/t/solved-trying-to-update-mongodb-from-3-2-to-4-0-in-docker-but-errors/3200 "2019-02-14T10:55:06Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![cim](https://sea1.discourse-cdn.com/flex021/user_avatar/forums.rocket.chat/cim/32/1928_2.png) [@cim](https://forums.rocket.chat/u/cim)\
**Post date:** [February 15, 2019, 12:20pm UTC](https://forums.rocket.chat/t/solved-trying-to-update-mongodb-from-3-2-to-4-0-in-docker-but-errors/3200/2 "2019-02-15T12:20:43Z")

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I managed to fixed this by upgrading version by version: 3.2, 3.4, 3.6, and then finally 4.0. If anyone has a better way then please post it. Here are my steps when upgrading using docker-compose.yml:

```auto
# starting from 3.2, down the containers and update your mongo version in docker-compose.yml
docker-compose -f /path/to/rocketchat/docker-compose.yml down
sed -i "s/mongo:3.2/mongo:3.4/g" /path/to/rocketchat/docker-compose.yml

# starting up the updated docker-compose.yml will pull new mongo image
docker-compose -f /path/to/rocketchat/docker-compose.yml up -d mongo

# this command will update the db to use the new version features
docker exec -it rocketchat_mongo_1 bash -c 'mongo --eval "db.adminCommand( { setFeatureCompatibilityVersion: "3.4" } )"'

# should see an output like this
{ "ok" : 1 }

# initialize rocketchat server to load new db features and update your data files
# not sure if this step necessary but I'm not taking any risks
docker-compose -f /path/to/rocketchat/docker-compose.yml up -d

# go back to step 1, change values, rinse and repeat!

```

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