ModuleNotFoundError: No module named 'yaml' when using 0.3.1 & 0.3.2

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\quint\scoop\apps\miniconda3\current\envs\tf210\lib\site-packages\emd\__init__.py", line 5, in <module>
    from . import spectra  # noqa: F401, F403
  File "C:\Users\quint\scoop\apps\miniconda3\current\envs\tf210\lib\site-packages\emd\spectra.py", line 31, in <module>
    from . import utils
  File "C:\Users\quint\scoop\apps\miniconda3\current\envs\tf210\lib\site-packages\emd\utils.py", line 27, in <module>
    from .sift import interp_envelope
  File "C:\Users\quint\scoop\apps\miniconda3\current\envs\tf210\lib\site-packages\emd\sift.py", line 23, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

I met the above error when using 0.3.1 and 0.3.2. But it works fine when I using 0.3.0