[SOLVED] pymongo [SSL: CERTIFICATE_VERIFY_FAILED]: certificate has expired on Mongo Atlas

I am using MongoDB(Mongo Atlas) in my Django app. All was working fine till yesterday. But today, when I ran the server, it is showing me the following error on console

Exception in thread django-main-thread:
Traceback (most recent call last):
  File "c:\users\admin\appdata\local\programs\python\python39\lib\threading.py", line 973, in _bootstrap_inner
    self.run()
  File "c:\users\admin\appdata\local\programs\python\python39\lib\threading.py", line 910, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\utils\autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\core\management\commands\runserver.py", line 121, in inner_run
    self.check_migrations()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\core\management\base.py", line 486, in check_migrations
    executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\migrations\executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\migrations\loader.py", line 53, in __init__
    self.build_graph()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\migrations\loader.py", line 220, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\migrations\recorder.py", line 77, in applied_migrations
    if self.has_table():
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\migrations\recorder.py", line 56, in has_table
    tables = self.connection.introspection.table_names(cursor)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\backends\base\introspection.py", line 52, in table_names
    return get_names(cursor)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\django\db\backends\base\introspection.py", line 47, in get_names
    return sorted(ti.name for ti in self.get_table_list(cursor)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\djongo\introspection.py", line 47, in get_table_list
    for c in cursor.db_conn.list_collection_names()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\database.py", line 880, in list_collection_names
    for result in self.list_collections(session=session, **kwargs)]
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\database.py", line 842, in list_collections
    return self.__client._retryable_read(
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\mongo_client.py", line 1514, in _retryable_read
    server = self._select_server(
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\mongo_client.py", line 1346, in _select_server
    server = topology.select_server(server_selector)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\topology.py", line 244, in select_server
    return random.choice(self.select_servers(selector,
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\topology.py", line 202, in select_servers
    server_descriptions = self._select_servers_loop(
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python39\Lib\site-packages\pymongo\topology.py", line 218, in _select_servers_loop
    raise ServerSelectionTimeoutError(
pymongo.errors.ServerSelectionTimeoutError: cluster0-shard-00-02.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129),cluster0-shard-00-01.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129),cluster0-shard-00-00.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129), Timeout: 30s, Topology Description: <TopologyDescription id: 6155f0c9148b07ff5851a1b3, topology_type: ReplicaSetNoPrimary, servers: [<ServerDescription ('cluster0-shard-00-00.mny7y.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-00.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129)')>, <ServerDescription ('cluster0-shard-00-01.mny7y.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-01.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129)')>, <ServerDescription ('cluster0-shard-00-02.mny7y.mongodb.net', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('cluster0-shard-00-02.mny7y.mongodb.net:27017: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1129)')>]>

I am using djongo as the database engine

DATABASES = {
    'default': {
            'ENGINE': 'djongo',
            'NAME': 'DbName',
            'ENFORCE_SCHEMA': False,
            'CLIENT': {
                'host': 'mongodb+srv://username:password@cluster0.mny7y.mongodb.net/DbName?retryWrites=true&w=majority'
            }  
    }
}

And following dependencies are being used in the app

dj-database-url==0.5.0
Django==3.2.5
djangorestframework==3.12.4
django-cors-headers==3.7.0
gunicorn==20.1.0
psycopg2==2.9.1
pytz==2021.1
whitenoise==5.3.0
djongo==1.3.6
dnspython==2.1.0

What should be done in order to resolve this error?