GitHub

42 changes, 42 breaking, breaking first, read from https://github.blog/changelog. The words and the dates are the source's; the severity is reef's.

1. breaking
   GitHub Copilot models deprecated on October 19, 20262026-10-19 · copilot
2. breaking
   CodeQL changes for macOS 27, Xcode 27, and Swift 6.42026-10-19 · application-security
3. breaking
   Upcoming deprecation of selected GitHub Copilot models in mid-November2026-10-15 · effective 2026-11-16 · copilot
4. breaking
   Email notifications for repository push events have been retired2026-10-15 · community-engagement
5. breaking
   Improved detection for withdrawn Dependabot alerts2026-10-13 · supply-chain-security
6. breaking
   Unvalidated npm trusted publishing configurations now expire2026-10-02 · supply-chain-security
7. breaking
   Selected models in GitHub Copilot deprecated2026-10-02 · copilot
8. breaking
   GitHub Actions: macOS 14 runner image retirement2026-10-01 · effective 2026-10-05 · sunset 2026-11-02 · actions
9. breaking
   Actions retention now covers checks, runs, and statuses2026-10-01 · actions
10. breaking
    X25519-only TLS ends for GHE.com on October 72026-09-30 · effective 2026-10-07 · application-security, ecosystem-and-accessibility, enterprise-management-tools
11. breaking
    Self-hosted runner version enforcement date has moved2026-09-28 · effective 2026-09-29 · actions
12. breaking
    Node 20 is no longer available in GitHub Actions2026-09-23 · actions
13. breaking
    Security improvements for SSH2026-09-22 · effective 2026-10-14 · sunset 2027-01-13 · account-management, application-security
14. breaking
    Deprecation notice: All-platform CodeQL bundle2026-09-22 · application-security
15. breaking
    Upcoming deprecation of selected GitHub Copilot models in mid-October2026-09-18 · effective 2026-10-19 · copilot
16. breaking
    SHA-1 in HTTPS on GitHub sunset2026-09-15 · ecosystem-and-accessibility
17. breaking
    MAI-Code-1-Flash deprecated2026-09-10 · copilot
18. breaking
    Upcoming deprecation of selected GitHub Copilot models2026-09-03 · effective 2026-10-02 · copilot
19. breaking
    GitHub CLI Linux package signing key expires September 52026-09-03 · effective 2026-09-05 · client-apps
20. breaking
    Selected GitHub Copilot models deprecated2026-08-31 · effective 2026-09-01 · copilot
21. breaking
    GitHub Classroom deprecated2026-08-27 · effective 2026-08-28 · community-engagement
22. breaking
    Actions retention will cover checks, workflow runs, and statuses2026-08-27 · effective 2026-09-15 · sunset 2026-10-01 · actions
23. breaking
    Windows 11 arm64 VS2026 image generally available2026-08-20 · effective 2026-09-21 · sunset 2026-09-30 · actions
24. breaking
    Upcoming deprecation of MAI-Code-1-Flash2026-08-11 · effective 2026-09-10 · copilot
25. breaking
    Custom thread subscriptions are being deprecated2026-08-10 · effective 2026-08-14 · collaboration-tools, community-engagement, projects-and-issues
26. breaking
    GitHub Code Quality no longer adds Copilot as a reviewer2026-08-07 · application-security, copilot
27. breaking
    Upcoming deprecation of GitHub Spark on github.com2026-08-04 · effective 2026-08-31 · copilot, ecosystem-and-accessibility
28. breaking
    Retiring the Copilot Billing Preview app2026-08-04 · copilot, enterprise-management-tools
29. breaking
    Upcoming August 2026 model deprecations in GitHub Copilot2026-07-31 · effective 2026-09-01 · copilot
30. breaking
    Restricting npm bypass-2FA granular access tokens2026-07-31 · supply-chain-security
31. breaking
    Gemini 2.5 Pro and Gemini 3 Flash deprecated2026-07-31 · copilot
32. breaking
    GitHub Models is now retired2026-07-30 · ecosystem-and-accessibility
33. breaking
    Upcoming GHES change impacting uploading support bundles2026-07-22 · effective 2026-08-18 · collaboration-tools
34. breaking
    npm install-time security and GAT bypass2fa deprecation2026-07-08 · supply-chain-security
35. breaking
    Copilot Billing Preview app will be retired on August 32026-07-07 · effective 2026-08-03 · copilot, enterprise-management-tools
36. breaking
    Upcoming deprecation of Gemini 2.5 Pro and Gemini 3 Flash2026-07-02 · effective 2026-07-31 · copilot
37. breaking
    GitHub Models is being fully retired on July 30, 20262026-07-01 · effective 2026-07-30 · ecosystem-and-accessibility
38. breaking
    Upcoming access restrictions to public API endpoints and UI views2026-06-30 · application-security
39. breaking
    Upcoming cloud data retention policy for closed security alerts2026-06-30 · effective 2026-09-25 · application-security, supply-chain-security
40. breaking
    Deprecation of Python 3.9 for Dependabot2026-06-23 · supply-chain-security
41. breaking
    Upcoming deprecation of Opus 4.6 (fast)2026-06-18 · effective 2026-06-29 · copilot
42. breaking
    GitHub Models is no longer available to new customers2026-06-16 · ecosystem-and-accessibility