pandas_datareaderでの株価取得

前提

python3、JupyterLab使用

実現したいこと

pandas_datareaderで株価の取得を行いたいのですが、先日までコードが動いていたのに
今日になってエラーが発生するようになりました。
解決方法をご教授いただきたく思います。

発生している問題・エラーメッセージ

TypeError                                 Traceback (most recent call last)
Input In [17], in <cell line: 4>()
      1 start = pd.Timestamp('2017-11-16')
      2 end = pd.Timestamp('2022-11-15')
----> 4 asa_data = web.DataReader(['9687.T'], 'yahoo', start, end)\
      5       [['High','Low','Open','Close','Volume','Adj Close']]
      7 asa_data.info()

File ~\anaconda3\lib\site-packages\pandas\util\_decorators.py:207, in deprecate_kwarg.<locals>._deprecate_kwarg.<locals>.wrapper(*args, **kwargs)
    205     else:
    206         kwargs[new_arg_name] = new_arg_value
--> 207 return func(*args, **kwargs)

File ~\anaconda3\lib\site-packages\pandas_datareader\data.py:370, in DataReader(name, data_source, start, end, retry_count, pause, session, api_key)
    367     raise NotImplementedError(msg)
    369 if data_source == "yahoo":
--> 370     return YahooDailyReader(
    371         symbols=name,
    372         start=start,
    373         end=end,
    374         adjust_price=False,
    375         chunksize=25,
    376         retry_count=retry_count,
    377         pause=pause,
    378         session=session,
    379     ).read()
    381 elif data_source == "iex":
    382     return IEXDailyReader(
    383         symbols=name,
    384         start=start,
   (...)
    390         session=session,
    391     ).read()

File ~\anaconda3\lib\site-packages\pandas_datareader\base.py:258, in _DailyBaseReader.read(self)
    256     df = self._dl_mult_symbols(self.symbols.index)
    257 else:
--> 258     df = self._dl_mult_symbols(self.symbols)
    259 return df

File ~\anaconda3\lib\site-packages\pandas_datareader\base.py:268, in _DailyBaseReader._dl_mult_symbols(self, symbols)
    266 for sym in sym_group:
    267     try:
--> 268         stocks[sym] = self._read_one_data(self.url, self._get_params(sym))
    269         passed.append(sym)
    270     except (IOError, KeyError):

File ~\anaconda3\lib\site-packages\pandas_datareader\yahoo\daily.py:153, in YahooDailyReader._read_one_data(self, url, params)
    151 try:
    152     j = json.loads(re.search(ptrn, resp.text, re.DOTALL).group(1))
--> 153     data = j["context"]["dispatcher"]["stores"]["HistoricalPriceStore"]
    154 except KeyError:
    155     msg = "No data fetched for symbol {} using {}"

TypeError: string indices must be integers

該当のソースコード

import
1import pandas_datareader as web
2import numpy as np
3import pandas as pd
4from sklearn.preprocessing import MinMaxScaler
5from keras.models import Sequential
6from keras.layers import Dense, LSTM
7import matplotlib.pyplot as plt
8plt.style.use('fivethirtyeight')
9
10df = web.DataReader('9687.T' , data_source='yahoo', start='2017-11-16', end='2021-11-15')
11df
12---------------------------------------------------------------------------
13