<Collapsibletitle="Important: Upgrading to v2.x from v1.16.0 or older"type="info">
MongoDB major version was upgraded from `v5.x` to `6.x`. Please note that if your current ClearML Server version is older than
`v1.17` (where MongoDB `v5.x` was first used), you'll need to first upgrade to ClearML Server v1.17.
First upgrade to ClearML Server v1.17 following the procedure below and using [this `docker-compose` file](https://github.com/allegroai/clearml-server/blob/2976ce69cc91550a3614996e8a8d8cd799af2efd/upgrade/1_17_to_2_0/docker-compose.yml). Once successfully upgraded,
1. If upgrading from ClearML Server version older than 1.2, you need to migrate your data before upgrading your server. See instructions [here](clearml_server_mongo44_migration.md).