> ## Documentation Index
> Fetch the complete documentation index at: https://checkly-422f444a-paula-tree-202-entitlements-group-troubles.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update an environment variable

> Updates an environment variable. Uses the "key" field as the ID for updating. Only updates value, locked, and secret properties. Once a value is set to secret, it cannot be unset.