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How to release a new version of Holidays

  • Finalize the current development version
    • switch to dev branch and pull the most recent changes from https://github.com/vacanza/holidays remote dev branch.
    • generate release notes by running make release-notes
    • insert the command's output into the top of CHANGES file (see previous release notes for consistent formatting)
    • commit the updated CHANGES file to dev branch with the following commit message 'Finalize v<version>', e.g. 'Finalize v0.39'
    • push changes to https://github.com/vacanza/holidays dev branch
    • make sure the push related CI/CD jobs have been completed successfully
  • Merge the finalized changes into main branch:
    • create a new PR for the recent changes from dev to main branch using 'v<version>' as a PR title and the previously generated release notes as a PR description
    • get the PR reviewed by at least one of the code owners
    • merge the PR into main branch using 'Merge when ready' button
    • make sure the PR related CI/CD jobs have been completed successfully
    • make sure readthedocs.org documentation build jobs at https://readthedocs.org/projects/holidays/builds/ have been completed successfully
  • Create a new release:
    • open https://github.com/vacanza/holidays/releases page and click on the 'Draft a new release' button
    • click on 'Choose a tag', enter 'v<version>' into the input field (you should see something like 'Create a new tag: v0.39' on publish'
    • select main - instead of default dev in 'Target' dropdown
    • put 'v<version>' into 'Release title' field, e.g. 'v0.39'
    • click on 'Generate release notes' button to collect new contributors and full changelog link information (we normally keep it at the bottom with a bit of re-formatting)
    • replace auto-generated release notes with the previously generated release notes (keep the new contributors and full changelog link)
    • check/uncheck the 'Set as the latest release' checkbox depending on the release status
    • save the draft (do not publish it yet)
    • preview the release on https://github.com/vacanza/holidays/releases
    • after making sure everything looks right click 'Edit' and then 'Publish release'
  • Verify the new release:
    • make sure the release related CI/CD jobs have been completed successfully
    • check https://pypi.org/project/holidays/ package page -- it should have the current version and the released date updated
  • Finish the process with the following post-release actions:
    • send "Holidays 'v<version>' has been released!" (or similar) message to Vacanza Team Slack #release channel
    • pull the recent changes from main branch into dev
    • bump the Holidays version at holidays/version.py file
    • create a commit with 'Initialize v<version>' message, e.g. 'Initialize v0.40' and push it to dev branch (this may require running make package to pass the tests locally)
    • make sure dev branch is not behind the main branch (there will be a message on top of the https://github.com/vacanza/holidays/tree/dev page in case it is)
    • make sure the push related CI/CD jobs have been completed successfully