Python Mongodb: TypeError: upsert must be True or False

from pymongo import MongoClient
import datetime

import pymongo
print(pymongo.__version__)

client = MongoClient('mongodb://mongodb:27017')
collection = client.demo.data

collection.drop()

print("working:")
collection.update_one({ '_id' : 'stats'}, { '$set': { 'total': 1 } }, upsert=True)


print("failing:")
collection.update_one({ '_id' : 'stats'}, { '$set': { 'total': 2 } }, { "upsert": True })

3.10.1
Traceback (most recent call last):
  File "examples/mongodb/upsert_error.py", line 12, in <module>
    collection.update_one({ '_id' : 'stats'}, { '$set': { 'total': 2 } }, { "upsert": True })
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/collection.py", line 998, in update_one
    self._update_retryable(
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/collection.py", line 854, in _update_retryable
    return self.__database.client._retryable_write(
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1491, in _retryable_write
    return self._retry_with_session(retryable, func, s, None)
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/mongo_client.py", line 1384, in _retry_with_session
    return func(session, sock_info, retryable)
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/collection.py", line 846, in _update
    return self._update(
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/collection.py", line 767, in _update
    common.validate_boolean("upsert", upsert)
  File "/home/gabor/venv3/lib/python3.8/site-packages/pymongo/common.py", line 159, in validate_boolean
    raise TypeError("%s must be True or False" % (option,))
TypeError: upsert must be True or False