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`)
- Fixed regression in :meth:`DataFrame.agg` dropping values when the DataFrame had an Extension Array dtype, a duplicate index, and
axis=1(:issue:`42380`) - Fixed regression in :meth:`DataFrame.astype` changing the order of noncontiguous data (:issue:`42396`)
- Performance regression in :class:`DataFrame` in reduction operations requiring casting such as :meth:`DataFrame.mean` on integer data (:issue:`38592`)
- Fixed bug in :meth:`DataFrame.transpose` dropping values when the DataFrame had an Extension Array dtype and a duplicate index (:issue:`42380`)
.. contributors:: v1.3.0..v1.3.1|HEAD