PyMongo 4.18 Released

Product & Driver Announcements Driver Releases
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We are pleased to announce the 4.18.0 release of PyMongo - MongoDB’s Python Driver.

Changes in 4.18.0

PyMongo 4.18 brings a number of changes including:

  • Dropped support for MongoDB 4.2. Added support for MongoDB 9.0.
  • Improved performance for MongoDB 9.0’s Intelligent Workload Management (IWM) by only retrying overload errors when expected to not worsen server conditions.
  • Added general availability support for Queryable Encryption prefix, suffix, and substring queries against MongoDB 9.0+ (requires libmongocrypt 1.20.0 or later).
  • Added srvAllowedHostsSuffix as a URI option and keyword argument to MongoClient. When connecting via mongodb+srv:// , this option overrides the default requirement that SRV-returned hosts share the same parent domain as the seed hostname, allowing hosts under a different domain suffix to be accepted. The suffix must not be a public suffix (per the Public Suffix List).
  • Improved TLS connection performance by reusing TLS sessions across connections to the same server.
  • PyPy support is deprecated and will be removed in a future release.

Unavoidable breaking changes

  • Aggregation helpers now raise ConfigurationError when passed an aggregate or pipeline keyword argument. Previously these silently replaced the target namespace and pipeline.
  • operation_id is now stable across a logical operation’s retry attempts and no longer equals the per-attempt request_id.

Issues Resolved

See the PyMongo 4.18 release notes in JIRA for the list of resolved issues in this release.