particle breaking changes

1.0.0

1,298 breaking changes, first published June 25, 2026.

• Removed
  The 2020 and 2022 nucleus data files are no longer shipped. Code that loads them must use the 2026 nucleus data file. github.com
• Removed
  The superseded 2022 and 2023 PDG and derived data files are no longer shipped. Code that loads those data files must switch to a newer version. github.com
• Removed
  The package no longer supports Python 3.9. Users on Python 3.9 must stay on an earlier release or upgrade Python. github.com
• Removed particle.converters.corsika.BiMap
  particle.converters.corsika.BiMap was removed in particle 1.0.0 pypi.org
• Removed particle.converters.geant.BiMap
  particle.converters.geant.BiMap was removed in particle 1.0.0 pypi.org
• Removed particle.converters.pythia.BiMap
  particle.converters.pythia.BiMap was removed in particle 1.0.0 pypi.org
• Removed particle.corsika.corsika7id.data
  particle.corsika.corsika7id.data was removed in particle 1.0.0 pypi.org
• Removed particle.geant.geant3id.data
  particle.geant.geant3id.data was removed in particle 1.0.0 pypi.org
• Removed particle.geant.geant3id.MatchingIDNotFound
  particle.geant.geant3id.MatchingIDNotFound was removed in particle 1.0.0 pypi.org
• Removed particle.particle.literals.a_0_1450_0
  particle.particle.literals.a_0_1450_0 was removed in particle 1.0.0 pypi.org

And 1,288 more in this version.

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. A fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.