Helm dependency

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The helm dependency command operates on requirements.yaml file, with the aim of maintaining the content of the charts/ subdirectory in sync with requirements.yaml. For an in-depth discussion on how Helm dependencies work, see:
How Helm Dependencies Work

Dependency Update

Execute the following in the directory containing the chart:

helm dependency update
helm dep up

Alternatively, the command can be executed specifying the chart directory:

helm dependency update ./charts/my-chart

When this command retrieves charts, it will store them as chart archives in the charts/ directory of the dependent chart:

helm dependency update postgresql-dynamic-dependency/
Hang tight while we grab the latest from your chart repositories...
...Unable to get an update from the "local" chart repository (
	Get dial tcp connect: connection refused
...Successfully got an update from the "incubator" chart repository
...Successfully got an update from the "stable" chart repository
Update Complete.
Saving 1 charts
Downloading postgresql from repo https://kubernetes-charts.storage.googleapis.com
Deleting outdated charts

As result, postgresql-6.3.2.tgz is placed into the dependent chart's charts/ directory.

The command recreates requirements.lock. If requirements.yaml changes, Helm will notice that the file changes and will update requirements.lock to reflect those changes.

For more details on how transitive dependencies are handled, see:
Transitive Dependencies