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December 8th, 2025

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Breaking Changes:

  • 🐛⚠️ (server, smithy-rs#4400, smithy-rs#4397) Fix issue where SigV4 envelopes for EventStreams did not support the initial message. This is technically a breaking change but should not break consumers in practice since the
    resulting type has the same methods.

New this release:

  • 🎉 (client, @annahay) Added methods in token bucket to indicate if bucket is full or empty
  • 🐛 (client, smithy-rs#4427) Fix Content-Type and Accept headers for event streams in RPC v2 CBOR to set application/vnd.amazon.eventstream
  • 🐛 (client, aws-sdk-rust#1390, @arielb1) In legacy-rustls-ring, polyfill with_native_roots to use rustls_native_certs 0.8 to avoid
    RUSTSEC-2025-0134.
  • 🐛 (all, @arielby) Publish an MSRV for all packages

Contributors
Thank you for your contributions! ❤