# Homebrew

**[Homebrew](https://brew.sh/)** is a free and open-source software package management system that simplifies the installation of software on Apple's operating system, macOS.

# Update & Upgrade

## Update

First, you need to fetch the newest version of Homebrew and all formulae from GitHub using git and perform any necessary migrations.

```sh
brew update
```

## Upgrade

To upgrade all the outdated casks and outdated, unpinned formulae using the same options they were originally installed with.

```sh
brew upgrade
```

To upgrade a particular cask or formulae:

```sh
brew upgrade [installed_formula / installed_cask]
```