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orjson v3.11.7 Release Notes

Release Date: 2026-02-02 // about 2 months ago

  • 🔄 Changed

    • 👉 Use a faster library to serialize float. Users with byte-exact regression
      ✅ tests should note positive exponents are now written using a +, e.g.,
      1.2e+30 instead of 1.2e30. Both formats are spec-compliant.
    • 🆓 ABI compatibility with CPython 3.15 alpha 5 free-threading.

Previous changes from v3.11.6

  • 🔄 Changed

    • orjson now includes code licensed under the Mozilla Public License 2.0 (MPL-2.0).
    • ⬇️ Drop support for Python 3.9.
    • ABI compatibility with CPython 3.15 alpha 5.
    • 🏗 Build now depends on Rust 1.89 or later instead of 1.85.

    🛠 Fixed

    • 🛠 Fix sporadic crash serializing deeply nested list of dict.