Sourced from pymongo's releases.

PyMongo 4.14.1

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-14-1-released/327511

PyMongo 4.14.0

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-14-released/326906

Sourced from pymongo's changelog.

Changes in Version 4.14.1 (2025/08/19)

Version 4.14.1 is a bug fix release.

• Fixed a bug in MongoClient.append_metadata() and AsyncMongoClient.append_metadata() that allowed duplicate DriverInfo.name to be appended to the metadata.

Issues Resolved ...............

See the PyMongo 4.14.1 release notes in JIRA_ for the list of resolved issues in this release.

.. _PyMongo 4.14.1 release notes in JIRA: https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10004&version=45256

Changes in Version 4.14.0 (2025/08/06)

.. warning:: PyMongo 4.14 drops support for MongoDB 4.0. PyMongo now supports MongoDB 4.2+.

PyMongo 4.14 brings a number of changes including:

• Dropped support for MongoDB 4.0.

• Added preliminary support for Python 3.14 and 3.14 with free-threading. We do not yet support the following with Python 3.14:

  • Subinterpreters (concurrent.interpreters)
  • Free-threading with Encryption
  • mod_wsgi

• Removed experimental support for free-threading support in Python 3.13.

• Added :attr:bson.codec_options.TypeRegistry.codecs and :attr:bson.codec_options.TypeRegistry.fallback_encoder properties to allow users to directly access the type codecs and fallback encoder for a given :class:bson.codec_options.TypeRegistry.

• Added :meth:pymongo.asynchronous.mongo_client.AsyncMongoClient.append_metadata and :meth:pymongo.mongo_client.MongoClient.append_metadata to allow instantiated MongoClients to send client metadata on-demand

• Improved performance of selecting a server with the Primary selector.

• Introduces a minor breaking change. When encoding :class:bson.binary.BinaryVector, a ValueError will be raised if the 'padding' metadata field is < 0 or > 7, or non-zero for any type other than PACKED_BIT.

• Changed :meth:~pymongo.uri_parser.parse_uri's options return value to be type dict instead of _CaseInsensitiveDictionary.

Issues Resolved

... (truncated)

• 0d2a4b4 Prep for 4.14.1 release (#2495)
• 550d234 PYTHON-5503 Use uv to install just in GitHub Actions (#2490) [v4.14] (#2493)
• d98049c PYTHON-5502 [v4.14] Fix handling of c extensions in Azure and GCP VMs (#2487)
• f66ec0f PYTHON-5492 Fix handling of MaxTimeMS message (#2484) [v4.14] (#2485)
• 6611bec PYTHON-5493 [v4.14] Add a patch for the log order difference (#2482)
• 7692bd6 PYTHON-5488 append_metadata should not add duplicates (#2461) [v4.14] (#2483)
• aa0b920 PYTHON-5492 Fix handling of MaxTimeMSExpired responses (#2477) [v4.14] (#2479)
• 1c48016 PYTHON-5349 Use drivers-evergreen-tools to start servers in GitHub Actions (#...
• 7055ad1 PYTHON-5492 Mark test as flaky (#2472) [v4.14] (#2475)
• e80f4f4 PYTHON-5491 Skip non-idempotent dropIndex tests (#2467) [v4.14] (#2468)
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