pip 升级问题

pip install xxxx

报错：

Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 283, in run
requirement_set.install(install_options, global_options, root=options.root_path)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1431, in install
requirement.uninstall(auto_confirm=True)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 598, in uninstall
paths_to_remove.remove(auto_confirm)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1836, in remove
renames(path, new_path)
File "/usr/lib/python2.7/dist-packages/pip/util.py", line 295, in renames
shutil.move(old, new)
File "/usr/lib/python2.7/shutil.py", line 303, in move
os.unlink(src)
OSError: [Errno 13] Permission denied: '/usr/bin/easy_install'

Storing debug log for failure in /home/phantomer/.pip/pip.log


查了是pip版本太低。apt-get install pip是最新的了。
机子是python2.7

有没有大神给我源之类的给我升级一下pip

或者有其他解决的方法。