GitLab frequently releases new versions with additional functionality. Once in a while, you may also need to upgrade to get bug fixes. Upgrading can be done easily using the Helm upgrade. Let's perform the following steps to upgrade GitLab to a new version: 

1. First, export the currently used arguments into a YAML file using the helm get values command as follows:

$ helm get values gitlab > gitlab.yaml

2. Upgrade the chart repositories to get new versions available from the remote repository:

$ helm repo update

3. List the available chart versions:

$ helm search -l gitlab/gitlab
NAME CHART VERSION APP VERSION DESCRIPTION
gitlab/gitlab 2.1.7 12.1.6 Web-based Git-repository manager with wiki and issue-trac...
gitlab/gitlab 2.1.6 12.1.4 Web-based Git-repository manager with wiki and issue-trac...
...

4. Use the same arguments with the new version to upgrade:

$ helm upgrade gitlab gitlab/gitlab --version 2.1.7 -f gitlab.yaml