title: How to update pip version installed by pyenv
body: <p>I'm using Python 3.6.5 with pyenv. pip 10 came out a while ago but pyenv is creating my new virtual environments with pip 9.0.3 and i have to update each one of them manually. It's annoying.</p>
  
  <p>I tried to update pyenv and re-installing Python version (i was hoping it will come with newer pip version but it didn't.) but no success.</p>
  
  <p>Should i wait for an update on pyenv side or am i missing something?</p>