Mac Command Line Tools Continue to Update
Ignore the update shown in the App Store. Install Command Line Tools by running the command:

xcode-select --install

In case the command doesn't work, and gives an error stating,


  xcode-select: error: command line tools are already installed, use "Software Update" to install updates


simply run brew config. It will show a dialogue box asking to accept Xcode license terms. Once accepted, Command Line Tools will be setup successfully.