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The MongoDB Rust driver team is pleased to announce the v3.8.0 release of the mongodb crate, now available for download from crates.io.

Highlighted Changes

In-Use Encryption String API GA

The string API for in-use encryption (previously named the text API) is now stable and GA! This brings with it the following changes:

  • The text-indexes-unstable feature is no longer required to enable this API. The feature still exists for backwards compatibility but does nothing.
  • The TextOptions struct is now StringOptions.
  • Algorithm::TextPreview is deprecated in favor of Algorithm::String.
  • The query types "prefixPreview", "suffixPreview", and "substringPreview" are deprecated in favor of "prefix", "suffix", and "substring" respectively.

The GA API requires mongodb server version 9.0. The preview API can continue to be used with pre-9.0 server versions.

Server 4.2 EOL

As of this release, connecting to server version 4.2 is deprecated. Support for 4.2 will be removed in the 3.9.0 release.

MONGODB-AWS explicit authentication property deprecation

The use of explicit username, password, or the "AWS_SESSION_TOKEN" property with the MONGODB-AWS auth mechanism is deprecated, and will emit warnings when debug assertions are enabled. Support for these will be removed in version 4.0 of the driver.

Hickory performance on Windows

A long-standing bug in the hickory-resolver case when running on Windows caused performance degredation when using a mongodb+srv connection string. Happily, this bug is now fixed, so users who previously used our recommended workaround of a custom DNS configuration on Windows can now remove that workaround.

Full Release Notes

Impactful changes are listed below; for a complete list of changes see this GitHub query.

New Features

  • RUST-2402 QE string API GA (#1727)
  • RUST-2376 Optionally redact errors containing URI elements (#1708)

Improvements

  • RUST-2388 Add AGENTS.md (#1706)
  • RUST-2299 Remove warnings about hickory performance (#1712)
  • RUST-2358 Update attribute name in OpenTelemetry Spec (#1713)
  • RUST-2248 Add deprecation warnings for explicit MONGODB-AWS auth properties (#1716)
  • RUST-2369 Add constructor methods for ReadPreference (#1732) (thanks @OnjoujiToki!)

Bugfixes

  • RUST-2437 Fix performance regression in Client::shutdown (#1718)
Source: README.md, updated 2026-07-09