--- setup.py.orig
+++ setup.py
@@ -136,7 +136,7 @@ if setuptools is not None:
         # Certifi is also optional on 2.7.9+, although making our dependencies
         # conditional on micro version numbers seems like a bad idea
         # until we have more declarative metadata.
-        install_requires.append('certifi')
+        # install_requires.append('certifi')
     if sys.version_info < (3, 5):
         install_requires.append('backports_abc>=0.4')
     kwargs['install_requires'] = install_requires