How to upgrade Codex CLI with Homebrew

Keeping the Codex CLI updated ensures newer models, features, and bug fixes are available immediately, and reduces surprises caused by mismatched configuration or deprecated options.

Homebrew tracks installed software through formulae and casks, and upgrades by refreshing local metadata, downloading the latest release, and relinking the executable on the current PATH. When Codex is installed as a cask, the standard cask upgrade workflow replaces the existing binary with the newer build.

Upgrades can fail or behave unexpectedly when an older codex binary exists earlier on the PATH or when the current process is still running while the cask is being replaced. Reliable network access is required for metadata refresh and downloads, and some cask upgrades may prompt for an administrator password when writing under /Applications.

Steps to upgrade Codex CLI with Homebrew:

Check whether the Codex cask is listed as outdated.
```
$ brew outdated --cask codex
codex
```
No output means the cask is already up to date.

Update the local Homebrew metadata.

$ brew update
Updated 1 tap (homebrew/cask).
Already up-to-date.

Upgrade the Codex cask.

$ brew upgrade --cask codex
==> Upgrading 1 outdated package:
codex 0.86.0 -> 0.87.0
##### snipped #####
🍺  codex was successfully upgraded!

If Codex was installed as a formula instead of a cask, use brew upgrade codex.

Confirm the active Codex version on the PATH.
```
$ codex --version
codex-cli 0.87.0
```
If the version does not change, confirm the resolved binary path with command -v codex and remove older installations that shadow the Homebrew one.

Author: Mohd Shakir Zakaria
Mohd Shakir Zakaria is a cloud architect with deep roots in software development and open-source advocacy. Certified in AWS, Red Hat, VMware, ITIL, and Linux, he specializes in designing and managing robust cloud and on-premises infrastructures.