These are the changes in pandas 1.3.1. See :ref:`release` for a full changelog including other versions of pandas.
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- Pandas could not be built on PyPy (:issue:`42355`)
- :class:`DataFrame` constructed with with an older version of pandas could not be unpickled (:issue:`42345`)
- Performance regression in constructing a :class:`DataFrame` from a dictionary of dictionaries (:issue:`42338`)
-Bug in :meth:`pandas.cut` on :class:`Series` with duplicate indices (:issue:`42185`) and non-exact :meth:`pandas.CategoricalIndex` (:issue:`42425`) -
.. contributors:: v1.3.0..v1.3.1|HEAD