pyo3 breaking changes

0.30.1

59 breaking changes, first published October 14, 2026.

• Removed pyo3::prelude::Py::from_borrowed_ptr
  Use Borrowed::from_borrowed_ptr instead. crates.io
• Removed pyo3::prelude::Py::from_borrowed_ptr_or_err
  Use Borrowed::from_borrowed_ptr_or_err instead. crates.io
• Removed pyo3::prelude::Py::from_borrowed_ptr_or_opt
  Use Borrowed::from_borrowed_ptr_or_opt instead. crates.io
• Removed pyo3::prelude::Py::from_owned_ptr
  Use Bound::from_owned_ptr instead. crates.io
• Removed pyo3::prelude::Py::from_owned_ptr_or_err
  Use Bound::from_owned_ptr_or_err instead. crates.io
• Removed pyo3::prelude::Py::from_owned_ptr_or_opt
  Use Bound::from_owned_ptr_or_opt instead. crates.io
• Removed pyo3::Py::from_borrowed_ptr
  Use Borrowed::from_borrowed_ptr instead. crates.io
• Removed pyo3::Py::from_borrowed_ptr_or_err
  Use Borrowed::from_borrowed_ptr_or_err instead. crates.io
• Removed pyo3::Py::from_borrowed_ptr_or_opt
  Use Borrowed::from_borrowed_ptr_or_opt instead. crates.io
• Removed pyo3::Py::from_owned_ptr
  Use Bound::from_owned_ptr instead. crates.io

And 49 more in this version.

0.29.0

65 breaking changes, first published June 11, 2026.

• Removed
  PyO3 0.29 no longer supports the experimental free-threaded Python 3.13t build; use Python 3.14t instead. github.com
• Removed
  PyO3 0.29 no longer supports Python 3.7, so projects on Python 3.7 must stay on PyO3 0.28 or move to a newer Python. github.com
• Removed
  Private CPython APIs with the _Py underscore prefix have been removed from pyo3-ffi's public API, so code that uses them must change. github.com
• Removed From<char.DecodeUtf16Error> for PyErr
  Build a UnicodeDecodeError manually with PyUnicodeDecodeError::new_err instead. pyo3.rs
• Removed pyo3::conversion::FromPyObject::type_input
  pyo3::conversion::FromPyObject::type_input was removed in pyo3 0.29.0 crates.io
• Removed pyo3::conversion::IntoPyObject::type_output
  pyo3::conversion::IntoPyObject::type_output was removed in pyo3 0.29.0 crates.io
• Removed pyo3::DowncastError
  Use CastError instead. crates.io
• Removed pyo3::DowncastIntoError
  Use CastIntoError instead. crates.io
• Removed pyo3::FromPyObject::type_input
  pyo3::FromPyObject::type_input was removed in pyo3 0.29.0 crates.io
• Removed pyo3::import_exception_bound!
  pyo3::import_exception_bound! was removed in pyo3 0.29.0 crates.io

And 55 more in this version.

0.28.2

61 breaking changes, first published February 18, 2026.

• Removed PyClassInitializer
  The From<Bound<T>> and From<Py<T>> conversions into PyClassInitializer were removed. Use clone or clone_ref on the existing object instead. pyo3.rs
• Removed pyo3::buffer::PyBuffer::buf_ptr
  pyo3::buffer::PyBuffer::buf_ptr was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::dimensions
  pyo3::buffer::PyBuffer::dimensions was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::format
  Methods such as format moved from PyBuffer to PyUntypedBuffer. Method call syntax still works through dereferencing, but direct references to the moved functions need updating. crates.io
• Removed pyo3::buffer::PyBuffer::get_ptr
  pyo3::buffer::PyBuffer::get_ptr was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::is_c_contiguous
  pyo3::buffer::PyBuffer::is_c_contiguous was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::is_fortran_contiguous
  pyo3::buffer::PyBuffer::is_fortran_contiguous was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::item_count
  pyo3::buffer::PyBuffer::item_count was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::item_size
  pyo3::buffer::PyBuffer::item_size was removed in pyo3 0.28.2 crates.io
• Removed pyo3::buffer::PyBuffer::len_bytes
  pyo3::buffer::PyBuffer::len_bytes was removed in pyo3 0.28.2 crates.io

And 51 more in this version.

0.28.0

2 breaking changes, first published February 18, 2026.

• Removed
  Code that relied on these private FFI definitions from pyo3::ffi will no longer compile. github.com
• Configuration changed
  Projects building PyO3 must use Rust 1.83 or later. github.com

0.30.0

2 breaking changes, first published October 14, 2026.

• Removed
  Python 3.8 is no longer supported, so projects on it must move to a newer Python version before upgrading. github.com
• Configuration changed
  Projects must build with Rust 1.85 or newer to use this release. github.com

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.