When I try to install or update a plugin from the Control Panel, I see a message "***Updating Composer Dependencies***" and then the following error occurs. I'm running Craft on a local environment. Installing and updating from the command line works fine. 

    Status: Internal Server Error

    Response:
    PHP Fatal Error 'yii\base\ErrorException' with message 'Maximum execution time of 30 seconds exceeded'
    in ...\vendor\composer\composer\src\Composer\Util\RemoteFilesystem.php:555

    Stack trace:
    #0 [internal function]: yii\base\ErrorHandler->handleFatalError()
    #1 {main}