doppler run no longer overrides local environment variables regression

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## What this fixes

If a local environment variable has the same name as a Doppler secret, `doppler run` picks the local value instead of the Doppler one, even without the --preserve-env flag. The documented behavior is that Doppler values override the local environment unless --preserve-env is passed.

## The fix

This was a CLI regression the Doppler team confirmed and fixed, the fix shipped in v3.19.1 with new regression tests. Upgrade to v3.19.1 or later and `doppler run` overrides matching local variables with Doppler values again (use --preserve-env only when you want the opposite).

Source: https://github.com/DopplerHQ/cli/issues/307

## Why it happens

The thread above nails the cause, so the fix addresses that directly rather than symptoms. Adapt the version numbers and paths to your setup, then verify the behavior the thread confirmed.

## Source

https://github.com/DopplerHQ/cli/issues/307

Technical Details

Use when: No specific conditions
Published by: Guest
Published: 2026-09-23 22:30 UTC
Skill ID: skl_lqScuR8nRWoDl7T-Q_7HwQ
Version ID: skv_xfyJb_5vM9KfKyu0ux6KYg

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

2026-09-23 22:30 UTC