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CHANGELOG

Versioning

The H3 core library adheres to Semantic Versioning. H3-Py has a major.minor.patch version scheme. The major and minor version numbers of H3-Py are the major and minor version of the bound core library, respectively. The patch version is incremented independently of the core library.

We use this changelog structure.

Because H3-Py is versioned in lockstep with the H3 core library, please avoid adding features or APIs which do not map onto the H3 core API.

Unreleased

[4.5.0a2] - 2026-02-27

  • cells_to_h3shape/cells_to_geo now handle all valid cell sets, including sets that would produce global polygons crossing the antimeridian, poles, or are larger than a hemisphere
    • Duplicate cells now raise H3DuplicateInputError
    • Mixed-resolution cells now raise H3ResMismatchError
    • Internal: switch from linked-list to array-based C API for cells-to-polygon conversion

[4.5.0a1] - 2026-02-25

  • Update h3lib with draft v4.5 changes
  • Drop Python 3.8 and 3.9 (EOL); minimum is now Python 3.10
  • Document Python 3.14 support
  • Migrate build tooling from Makefile/pip to justfile/uv, including CI

[4.4.2] - 2026-01-29

  • Check for error from cellsToLinkedMultiPolygon (#477)

[4.4.1] - 2025-12-15

  • Fix PyPI publishing issue (#474)

[4.4.0] - 2025-12-12 (never published on PyPI)

  • Update h3lib to v4.4.1. (#470)
    • Add new error codes:
      • H3IndexInvalidError
      • H3BaseCellDomainError
      • H3DigitDomainError
      • H3DeletedDigitError
    • Add new functions:
      • is_valid_index
      • get_index_digit
      • construct_cell
      • deconstruct_cell

[4.3.1] - 2025-08-10

  • Build wheels for Windows on ARM64 (#463)

[4.3.0] - 2025-06-17

  • Update h3lib to v4.3.0. (#461)
    • Uses gridRing (uber/h3#1016) instead of Cython fallback logic.

[4.2.2] - 2025-03-10

  • Update h3lib to v4.2.1. (#450)

[4.2.1] - 2025-01-31

  • Correct pyproject.toml links for PyPI (#441)
  • Update coverage badge (#443)

[4.2.0] - 2025-01-26

  • Update h3lib to v4.2.0. (#432)
  • Add h3shape_to_cells_experimental (#436)
    • Add polygon_to_cells_experimental alias

[4.1.2] - 2024-10-26

  • Build Python 3.13 wheels (#425)

[4.1.1] - 2024-10-13

  • Make sure docs and PyPI page are up-to-date.

[4.1.0] - 2024-10-13

  • Final v4.1 release inculdes all v4.x changes below.

[4.1.0b3] - 2024-10-05

  • Allow for str subtypes, like numpy.str_ (#408)

[4.1.0b2] - 2024-09-27

  • Add cell_to_child_pos, child_pos_to_cell, cell_to_children_size (#405)

[4.1.0b1] - 2024-09-26

  • Bump h3lib to v4.1.0 (#402)
  • Add polygon_to_cells alias (#399)

[4.0.0b7] - 2024-09-04

  • Use pyproject.toml and scikit-build-core (#378)

[4.0.0b6] - 2024-09-03

  • Added bindings for cellToVertex, cellToVertexes, vertexToLatLng, and isValidVertex (#388)

[4.0.0b5] - 2024-05-19

  • Rename H3Poly and H3MultiPoly to LatLngPoly and LatLngMultiPoly (#364)
  • Add ability to convert from __geo_interface__ objects with Z-coordinate (#371)

[4.0.0b4] - 2024-04-14

No changes, just testing: #360

[4.0.0b3] - 2024-03-11

  • Change supported Python versions to 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 (#324, #325, #347, #348)
  • New h3.Polygon()/GeoJSON interface (#301)
  • Use functions instead of methods for the interface functions (#334)
  • Use list instead of set for unordered Python outputs (#339)

[4.0.0b2] - 2022-11-23

  • Build Python 3.11 wheels (#297)

[4.0.0b1] - 2022-08-23

Beta release; feedback welcome!

[3.7.4] - 2022-04-14

  • Website and API documentation; along with docstring cleanup.
  • Add support for linters and IDE tooling (#213)
  • Remove Py 3.5 wheel for Windows (#214)
  • Py 3.10 wheels and on more architectures (#220, #221, #223, #225)
  • Greatly reduce sdist size (#227, #229)

[3.7.3] - 2021-06-12

  • Wheels for Linux Aarch64 (#189)

[3.7.2] - 2021-03-01

  • Add vectorized h3_to_parent and h3_get_resolution (#166)

[3.7.1] - 2020-12-18

  • fix for #169: h3_distance error reporting (#175)
  • build Python 3.9 wheel for Mac (#175)
  • bump h3lib version to v3.7.1 (#175)

[3.7.0] - 2020-10-02

  • Add functions (#171)
    • cell_area
    • exact_edge_length
    • point_dist

[3.6.4] - 2020-07-20

  • Add requirements.in for pip-compile usage (#157)
  • Update h3-c to v3.6.4 (#157)
  • Add functions:
    • experimental_local_ij_to_h3 (#155)
    • experimental_h3_to_local_ij (#155)
    • h3.unstable.vect.cell_haversine (#147)
    • h3.unstable.vect.geo_to_h3 (#147)
    • Prototype v4 names under h3.unstable.v4 (#146)

[3.6.3] - 2020-06-04

  • Add functions:
    • get_res0_indexes
    • h3_to_center_child
    • h3_get_faces

[3.6.2] - 2020-06-02

  • Improve error reporting on str_to_int (#127)
  • Build Linux wheels for Python 2.7

[3.6.1] - 2020-05-29

  • Switch to Cython wrapper implementation
  • Pre-built wheels on PyPI for Linux/Mac/Windows
  • Provide multiple APIs:
    • h3.api.basic_str
    • h3.api.basic_int
    • h3.api.numpy_int
    • h3.api.memview_int

[3.4.3] - 2019-04-18

  • Removed null values in k_ring_distances.
  • Support on Windows Platform
  • Fixed some install problems

[3.4.2] - 2019-03-13

  • Added h3_line support.

[3.1.0] - 2018-09-06

Added

  • Added h3_distance function.

Changed

  • Updated the core library to v3.1.0.

[3.0.0] - 2018-07-24

Added

  • First public release.