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| 1 | 1 | Changelog | 
| 2 | 2 | ========= | 
| 3 | 3 | 
 | 
| 4 |  | -Changes in Version 4.14.0 (XXXX/XX/XX) | 
|  | 4 | +Changes in Version 4.14.0 (2025/08/06) | 
| 5 | 5 | -------------------------------------- | 
|  | 6 | + | 
| 6 | 7 | PyMongo 4.14 brings a number of changes including: | 
| 7 | 8 | 
 | 
| 8 |  | -- Added preliminary support for Python 3.14 and 3.14 with free-threading.  We do not yet support the following with Python 3.14: | 
| 9 |  | -    - Subinterpreters (``concurrent.interpreters``) | 
| 10 |  | -    - Free-threading with Encryption | 
| 11 |  | -    - mod_wsgi | 
|  | 9 | +- Added preliminary support for Python 3.14 and 3.14 with free-threading. We do | 
|  | 10 | +  not yet support the following with Python 3.14: | 
|  | 11 | + | 
|  | 12 | +  - Subinterpreters (``concurrent.interpreters``) | 
|  | 13 | +  - Free-threading with Encryption | 
|  | 14 | +  - mod_wsgi | 
|  | 15 | + | 
| 12 | 16 | - Removed experimental support for free-threading support in Python 3.13. | 
| 13 |  | -- Added :attr:`bson.codec_options.TypeRegistry.codecs` and :attr:`bson.codec_options.TypeRegistry.fallback_encoder` properties | 
| 14 |  | -  to allow users to directly access the type codecs and fallback encoder for a given :class:`bson.codec_options.TypeRegistry`. | 
| 15 |  | -- Added :meth:`pymongo.asynchronous.mongo_client.AsyncMongoClient.append_metadata` and | 
| 16 |  | -  :meth:`pymongo.mongo_client.MongoClient.append_metadata` to allow instantiated MongoClients to send client metadata | 
| 17 |  | -  on-demand | 
|  | 17 | +- Added :attr:`bson.codec_options.TypeRegistry.codecs` and | 
|  | 18 | +  :attr:`bson.codec_options.TypeRegistry.fallback_encoder` properties | 
|  | 19 | +  to allow users to directly access the type codecs and fallback encoder for a | 
|  | 20 | +  given :class:`bson.codec_options.TypeRegistry`. | 
|  | 21 | +- Added | 
|  | 22 | +  :meth:`pymongo.asynchronous.mongo_client.AsyncMongoClient.append_metadata` and | 
|  | 23 | +  :meth:`pymongo.mongo_client.MongoClient.append_metadata` to allow instantiated | 
|  | 24 | +  MongoClients to send client metadata on-demand | 
| 18 | 25 | - Improved performance of selecting a server with the Primary selector. | 
| 19 | 26 | 
 | 
| 20 |  | -- Introduces a minor breaking change. When encoding :class:`bson.binary.BinaryVector`, a ``ValueError`` will be raised | 
| 21 |  | -  if the 'padding' metadata field is < 0 or > 7, or non-zero for any type other than PACKED_BIT. | 
| 22 |  | -- Changed :meth:`~pymongo.uri_parser.parse_uri`'s ``options`` parameter to be type ``dict`` instead of ``_CaseInsensitiveDictionary``. | 
|  | 27 | +- Introduces a minor breaking change. When encoding | 
|  | 28 | +  :class:`bson.binary.BinaryVector`, a ``ValueError`` will be raised if the | 
|  | 29 | +  'padding' metadata field is < 0 or > 7, or non-zero for any type other than | 
|  | 30 | +  PACKED_BIT. | 
|  | 31 | +- Changed :meth:`~pymongo.uri_parser.parse_uri`'s ``options`` parameter to be | 
|  | 32 | +  type ``dict`` instead of ``_CaseInsensitiveDictionary``. | 
| 23 | 33 | 
 | 
| 24 | 34 | Changes in Version 4.13.2 (2025/06/17) | 
| 25 | 35 | -------------------------------------- | 
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