# Healthchecks v4.0

- Product: Healthchecks (https://whatsnew.fyi/product/healthchecks)
- Vendor: Pēteris Caune
- Date: 2026-01-22
- Version: v4.0
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.0
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.0

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- **removed** — Drop support for Python 3.11 and below; minimum required Python version is now 3.12
- **changed** — Upgrade to Django 6.0
- **changed** — Update the Matrix integration to use Matrix v3 API
- **changed** — Update email alert template to use user's preferred time zone
- **changed** — Update the web UI to use user's preferred timezone instead of browser's timezone
- **added** — Add data migration to update legacy timezones to current canonical timezones
- **changed** — Switch to using multicolor icon font for integration icons
- **fixed** — Fix the text version of email report for recently created checks
- **fixed** — Fix prepare_durations() to assert ping ordering by id not by created date
- **fixed** — Fix the Pause API call and UI action to no-op if the check is already paused

This release drops support of Python 3.11 and below. The minimum required Python
version is 3.12.

##### Improvements
- Upgrade to Django 6.0
- Update the Matrix integration to use Matrix v3 API (#1244)
- Update email alert template to use user's preferred time zone (#1230)
- Update the web UI to use user's preferred timezone instead of browser's timezone
- Add data migration to update legacy timezones to current canonical timezones (#1250)
- Switch to using multicolor icon font for integration icons

###### Bug Fixes
- Fix the text version of email report for recently created checks (#1236, @adelton)
- Fix prepare_durations() to assert ping ordering by id not by created date
- Fix the "Pause" API call and UI action to no-op if the check is already paused