# Deno unsupported lockfile version 5 Deno 1.43.5 lockfile v5 introduced

Status: search-observed
Product: Rocket.Chat
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/deno-unsupported-lockfile-version-5-deno-1435-lockfile-v5-introduced
Machine JSON: https://gitdocs.org/api/fixes/deno-unsupported-lockfile-version-5-deno-1435-lockfile-v5-introduced.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

The local repository can expose the failure, but the decisive repair depends on the current host, package, runtime, or API contract.

## Fix

```
Use the source trail below to align the local install, host, API, or runtime configuration with the current external contract.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- Deno unsupported lockfile version 5 Deno 1.43.5 lockfile v5 introduced
- Rocket.Chat Docker Deno 1.43.5 lockfile version 5 Deno 2 apps-engine
- Deno lockfile version 5 unsupported

## Sources

- Rocket.Chat Docker Deno lockfile issue: https://github.com/RocketChat/Rocket.Chat/issues/40473