title: update jupyter notebook to python 3.7
body: <p>I have python installed versions 3.73 but for jupyter notebook I have <code>3.6.8</code>. How to upgrade python to version 3.7+ on jupyter notebook?</p>
  
  <p>I tried:</p>
  
  <pre><code> conda update jupyter
  
   conda upgrade notebook
  </code></pre>
  
  <p>when I type in the terminal in virtual env python -V I get 3.73
  but when I check it in jupyter:</p>
  
  <pre><code> from platform import python_version
   print(python_version())
  </code></pre>
  
  <p>I get <code>3.6.8</code>.</p>