Python pip包RequestsDependencyWarning在安装elastic-search-curator时

Question

我通过以下命令安装了elastic search curator。

sudo pip install -U elasticsearch-curator

都安装好了。

但是，现在当我执行以下操作时

curator_cli --version

我得到以下依赖警告。

 /usr/local/lib/python2.7/dist-packages/requests/__init__.py:83: RequestsDependencyWarning: Old version of cryptography ([1, 2, 3]) may cause slowdown.
  warnings.warn(warning, RequestsDependencyWarning)
curator_cli, version 5.5.4

如何修复或隐藏警告？