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Install and configure Docker CE: https://docs.docker.com/docker-for-mac/.

Note: MM-9791 introduced using docker-compose to manage containers. To preserve your data on upgrade, execute the following steps.

First, backup from any existing containers:
```
mysqldump -h 127.0.0.1 --column-statistics=0 -u mmuser -p mattermost_test > mm_mysql_backup.sql
pg_dump -U mmuser -W -d mattermost_test -h 127.0.0.1 > mm_postgres_backup.bak
```
Then after upgrading and starting the new docker-compose managed containers, restore the data:
```
mysql -u mmuser -p -h 127.0.0.1 mattermost_test < mm_mysql_backup.sql
psql -U mmuser -W -h 127.0.0.1 -f mm_postgres_backup.bak mattermost_test
```
If you don’t migrate your data, the new, docker-compose-managed containers will start out empty. To remove the old containers – destroying any existing data – use make clean-old-docker.
Download and install homebrew: https://brew.sh/.
Install Go:
```
brew install go
```
Update your shell’s initialization script (e.g. .bashrc or .zshrc) and add the following:
```
export GOPATH=$HOME/go
export PATH=$PATH:$GOPATH/bin
ulimit -n 8096
```
Re-source your shell’s initialization script to update GOPATH and PATH in your current shell:
```
source $HOME/.bashrc
```
Fork https://github.com/mattermost/mattermost-server

Clone the Mattermost source code from your fork:

git clone https://github.com/YOUR_GITHUB_USERNAME/mattermost-server.git