requests 2.11.0 でContextualVersionConflictが出る

[dodo5522]

https://github.com/xively/xively-python/blob/master/requirements.txt

Installed /home/travis/build/dodo5522/solar_monitor/.eggs/requests-2.10.0-py3.3.egg
running egg_info
creating solar_monitor.egg-info
writing entry points to solar_monitor.egg-info/entry_points.txt
writing dependency_links to solar_monitor.egg-info/dependency_links.txt
writing requirements to solar_monitor.egg-info/requires.txt
writing solar_monitor.egg-info/PKG-INFO
writing top-level names to solar_monitor.egg-info/top_level.txt
writing manifest file 'solar_monitor.egg-info/SOURCES.txt'
reading manifest file 'solar_monitor.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'solar_monitor.egg-info/SOURCES.txt'
running build_ext
Coverage.py warning: No data was collected.
Traceback (most recent call last):
  File "setup.py", line 53, in <module>
    'Topic :: System :: Monitoring',
  File "/opt/python/3.3.5/lib/python3.3/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/opt/python/3.3.5/lib/python3.3/distutils/dist.py", line 930, in run_commands
    self.run_command(cmd)
  File "/opt/python/3.3.5/lib/python3.3/distutils/dist.py", line 949, in run_command
    cmd_obj.run()
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/setuptools/command/test.py", line 142, in run
    self.with_project_on_sys_path(self.run_tests)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/setuptools/command/test.py", line 121, in with_project_on_sys_path
    require('%s==%s' % (ei_cmd.egg_name, ei_cmd.egg_version))
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/pkg_resources/__init__.py", line 918, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/pkg_resources/__init__.py", line 810, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (requests 2.11.0 (/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages), Requirement.parse('requests<2.11.0,>=2.5'), {'keen'})
The command "coverage run --source=solar_monitor setup.py test" exited with 1.
Done. Your build exited with 1.