can't install: Need to update pywin32 dependencies

C:\Users\allen>pip list --outdated --format=columns | findstr docker
docker           2.6.1   3.3.0  wheel

produces the dependency chain:

Collecting pypiwin32==219; sys_platform == "win32" and python_version < "3.6" (from docker==3.3.0)
  Using cached https://files.pythonhosted.org/packages/a5/8d/739f12d811d19cd6686f97bb96b65b0e4c8ca428fb02581d872b912b14cf/pypiwin32-219-cp27-none-win_amd64.whl

but I am running the latest pywin32:

C:\Users\allen>pip list --format=columns | findstr pywin32
pywin32                      223

C:\Users\allen>pip show pywin32
Name: pywin32
Version: 223
Summary: Python for Window Extensions
Home-page: https://github.com/mhammond/pywin32
Author: Mark Hammond (et al)
Author-email: mhammond@skippinet.com.au
License: PSF
Location: c:\python27\lib\site-packages
Requires:
Required-by:

C:\Users\allen>python --version
Python 2.7.15

C:\Users\allen>ver

Microsoft Windows [Version 10.0.17134.48]

Not sure of why the version guards came (into requirements.txt/setup.py) in but pywin32 is supported on all Windows Python releases:
https://github.com/mhammond/pywin32/releases

Inspect the version guards in requirements.txt and setup.py that select pypiwin32 for Windows Python versions. Reproduce the dependency resolution on the reported Python 2.7 and Windows setup, then verify that installation uses the supported pywin32 dependency without the reported outdated package chain.