title: How do I upgrade packages used by iPython?
body: <p>I am using iPython on OSX (on system, not inside a virtualenv) and importing pandas into a notebook. My system python is Python 2. </p>
  
  <p>The version of pandas visible in the notebook is 0.16.2:</p>
  
  <pre><code>import pandas as pd
  print pd.__version__
  </code></pre>
  
  <p>I want to use pandas 0.18. So I have quit the notebook and run:</p>
  
  <pre><code>pip install --upgrade ipython
  pip install --upgrade pandas
  </code></pre>
  
  <p>This appeared to install ipython 4.1.2 and pandas 0.18.0, but if I run:</p>
  
  <pre><code>ipython --version
  </code></pre>
  
  <p>I see v4.0. And running my notebook still shows pandas 0.16.2.</p>
  
  <p>How do I upgrade my packages so that I can use pandas 0.18 inside my notebook?</p>