Comment 14 for bug 1487645

even the latest version of requests (2.7.0) does not support urllib3 1.11, so for Ubuntu/Debian this does not resolve the problem - I've spoken with upstream requests to see if we can get a patch to resolve this for the 2.7.0/1.11 combination we have right now.

For upstream development, capping the urllib3 version requirement makes sense until requests releases a version that supports 1.11.