我通过终端更新 sklearn 版本

conda install scikit-learn=0.18

如果我列出 conda list scikit-learn

# packages in environment at /Users/Claudia/anaconda:
scikit-learn              0.18.1              np111py27_1
scikit-learn              0.18.1                    <pip>

但是如果我在笔记本上运行

print('The scikit-learn version is {}.'.format(sklearn.__version__))

结果是

The scikit-learn version is 0.17.1.

如何解决和更新Jupyter Notebook中的版本？