Laravel 5.2 - How to update "updated_at" field with UTC timestamp?

I'm using Laravel 5.2 (on PHP version 7) and below is the update query I'm running:

$data=DB::table('posts')
                        ->where("id", $post_id)
                        ->update(
                            array(
                                'title'         =>      $request['title'],
                                'body'          =>      $request['body'],
                                'slug'          =>      str_slug($request['title']),
                                'updated_at'    =>      DB::raw('CURRENT_TIMESTAMP')
            ));

The "updated_at" field updated with the current time. But I want to update it with the UTC timestamp. How can I achieve this?

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