wrong version of matplotlib?

TypeError Traceback (most recent call last)
Cell In[27], line 1
----> 1 import cmocean

File ~/opt/anaconda3/lib/python3.9/site-packages/cmocean/init.py:11
8 from future import absolute_import
10 # from cmocean import *
---> 11 from . import cm, tools, data
13 all = ['cm',
14 'tools',
15 'plots',
16 'data']
18 authors = ['Kristen Thyng kthyng@tamu.edu']

File ~/opt/anaconda3/lib/python3.9/site-packages/cmocean/cm.py:34
30 cmap_d = dict()
33 # a comparable version object
---> 34 MPL_VERSION = Version(version("matplotlib"))
36 def _register_cmap(cmap, *, name):
37 # wrap matplotlib.cm API, use non-deprecated API when available
38 if MPL_VERSION >= Version("3.5"):

File ~/opt/anaconda3/lib/python3.9/site-packages/packaging/version.py:196, in Version.init(self, version)
185 """Initialize a Version object.
186
187 :param version:
(...)
192 exception will be raised.
193 """
195 # Validate the version and parse it into pieces
--> 196 match = self._regex.search(version)
197 if not match:
198 raise InvalidVersion(f"Invalid version: '{version}'")

TypeError: expected string or bytes-like object

Reproduce the import failure in the Python 3.9 Anaconda environment shown, then inspect cmocean/cm.py around the MPL_VERSION assignment and the matplotlib version lookup. Done means importing cmocean no longer raises the reported TypeError with the relevant matplotlib installation.