Cedar 18 upgrade?

[ckcollab]

I'm trying to update my heroku stack from cedar-14 to cedar-18 and it appears bumping to cedar-18 breaks things?

-----> Pelican app detected
-----> Installing Python (python-3.4.3)
-----> Ensure pip
       Ignoring indexes: https://pypi.python.org/simple
       Collecting setuptools
       Collecting pip
       Installing collected packages: pip, setuptools
       
       
       Successfully installed pip-6.0.8 setuptools-12.0.5
-----> Installing dependencies using pip
       You are using pip version 6.0.8, however version 20.0.2 is available.
       You should consider upgrading via the 'pip install --upgrade pip' command.
-----> Running pelican
       Done: Processed 17 articles and 2 pages in 5.45 seconds.
-----> Installing pcre (pcre-8.36)
-----> Installing nginx (nginx-1.7.2)
 !     Push rejected, failed to compile Pelican app.
 !     Push failed

Anyone else experiencing this?

[ckcollab]

@kylef sorry to bother, just wondering if you've gotten this running on cedar-18, did you have to do anything special?

EDIT:

$ heroku stack:set heroku-16 -a <my app>

seemed to fix it, for now! gives us a couple more years to figure out cedar-18 :)