# What’s new in 1.1.4 (October 30, 2020)

These are the changes in pandas 1.1.4. See Release notes for a full changelog including other versions of pandas.

## Fixed regressions

- Fixed regression in `read_csv()` raising a `ValueError` when `names` was of type `dict_keys` (GH36928)

- Fixed regression in `read_csv()` with more than 1M rows and specifying a `index_col` argument (GH37094)

- Fixed regression where attempting to mutate a `DateOffset` object would no longer raise an `AttributeError` (GH36940)

- Fixed regression where `DataFrame.agg()` would fail with `TypeError` when passed positional arguments to be passed on to the aggregation function (GH36948).

- Fixed regression in `RollingGroupby` with `sort=False` not being respected (GH36889)

- Fixed regression in `Series.astype()` converting `None` to `"nan"` when casting to string (GH36904)

- Fixed regression in `Series.rank()` method failing for read-only data (GH37290)

- Fixed regression in `RollingGroupby` causing a segmentation fault with Index of dtype object (GH36727)

- Fixed regression in `DataFrame.resample(...).apply(...)()` raised `AttributeError` when input was a `DataFrame` and only a `Series` was evaluated (GH36951)

- Fixed regression in `DataFrame.groupby(..).std()` with nullable integer dtype (GH37415)

- Fixed regression in `PeriodDtype` comparing both equal and unequal to its string representation (GH37265)

- Fixed regression where slicing `DatetimeIndex` raised `AssertionError` on irregular time series with `pd.NaT` or on unsorted indices (GH36953 and GH35509)

- Fixed regression in certain offsets (`pd.offsets.Day()` and below) no longer being hashable (GH37267)

- Fixed regression in `StataReader` which required `chunksize` to be manually set when using an iterator to read a dataset (GH37280)

- Fixed regression in setitem with `DataFrame.iloc()` which raised error when trying to set a value while filtering with a boolean list (GH36741)

- Fixed regression in setitem with a Series getting aligned before setting the values (GH37427)

- Fixed regression in `MultiIndex.is_monotonic_increasing` returning wrong results with `NaN` in at least one of the levels (GH37220)

- Fixed regression in inplace arithmetic operation on a Series not updating the parent DataFrame (GH36373)

## Bug fixes

- Bug causing `groupby(...).sum()` and similar to not preserve metadata (GH29442)

- Bug in `Series.isin()` and `DataFrame.isin()` raising a `ValueError` when the target was read-only (GH37174)

- Bug in `GroupBy.fillna()` that introduced a performance regression after 1.0.5 (GH36757)

- Bug in `DataFrame.info()` was raising a `KeyError` when the DataFrame has integer column names (GH37245)

- Bug in `DataFrameGroupby.apply()` would drop a `CategoricalIndex` when grouped on (GH35792)

## Contributors

For contributors, please see /usr/share/doc/contributors_list.txt or https://github.com/pandas-dev/pandas/graphs/contributors