`pip install --upgrade pip` で Bad md5 hash for package とかでて泣いたけどなおった

これがでて

§  {@} pip install --upgrade pip
You are using pip version 6.0.8, however version 6.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting pip
  Using cached pip-6.1.1-py2.py3-none-any.whl
  Hash of the package https://pypi.python.org/packages/py2.py3/p/pip/pip-6.1.1-py2.py3-none-any.whl#md5=172eb5abab25a5e0
f7a7b63c7a49378d (from https://pypi.python.org/simple/pip/) (cd51a97e9efb4b5377dd2be875e21e77) doesn't match the expecte
d hash 172eb5abab25a5e0f7a7b63c7a49378d!
  Bad md5 hash for package https://pypi.python.org/packages/py2.py3/p/pip/pip-6.1.1-py2.py3-none-any.whl#md5=172eb5abab2
5a5e0f7a7b63c7a49378d (from https://pypi.python.org/simple/pip/)

pip install --no-cache-dir --upgrade pip
したらなおった

§  {@} pip install --upgrade thefuck
Collecting thefuck
  Downloading thefuck-1.43-py2.py3-none-any.whl (160kB)
    100% |################################| 163kB 1.2MB/s
Requirement already up-to-date: psutil in c:\python34\lib\site-packages (from thefuck)
Requirement already up-to-date: colorama in c:\python34\lib\site-packages (from thefuck)
Collecting six (from thefuck)
  Downloading six-1.9.0-py2.py3-none-any.whl
Requirement already up-to-date: pathlib in c:\python34\lib\site-packages (from thefuck)
Installing collected packages: six, thefuck
  Found existing installation: thefuck 1.26
    Uninstalling thefuck-1.26:
      Successfully uninstalled thefuck-1.26
Successfully installed six-1.9.0 thefuck-1.43