AWS cloud9 環境での pkg_resources.DistributionNotFound The 'pip==9.0.3' distribution was not found and i

Question

AWS cloud9環境にて
botの研究を行なっています。

pipを使い、
pybitflyer
をインストールしたいのですが、次のエラーが出て前に進めずにいます。

pkg_resources.DistributionNotFound:
The 'pip==9.0.3' distribution was not found and is required by the application

対策方法をご教授頂きたいです。
よろしくお願いいたします。

コード

ec2-user:~/environment $ sudo pip-3.6 install pybitflyer
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 578, in _build_master
    ws.require(__requires__)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 895, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (pip 18.0 (/usr/local/lib/python3.6/site-packages), Requirement.parse('pip==9.0.3'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/pip-3.6", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3105, in <module>
    @_call_aside
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3089, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3118, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 580, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 593, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 781, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==9.0.3' distribution was not found and is required by the application
ec2-user:~/environment $ sudo pip-3.6 install pybitflyer
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 578, in _build_master
    ws.require(__requires__)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 895, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (pip 18.0 (/usr/local/lib/python3.6/site-packages), Requirement.parse('pip==9.0.3'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/pip-3.6", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3105, in <module>
    @_call_aside
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3089, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3118, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 580, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 593, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 781, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==9.0.3' distribution was not found and is required by the application
ec2-user:~/environment $