@lkaba2003 @NhanHuynh06 You don't have to remove this gem. Someone can use it so they can run postgresql database. So reverse this, run bundle again.

Redo this by:

From the master branch:
```
  git reset HEAD^
  git checkout Gemfile
  git checkout Gemfile.lock
  git checkout -b add-mysql-gem
```
From the add-mysql-gem branch: Add gem 'mysql2' back to Gemfile and run bundle again. Push to ```origin/add-mysql-gem``` branch, and create a Pull Request from that new branch.

Never update anything directly on master branch.