megachangelog
Announcement

Legacy Public App Creation Sunset

Beginning May 26, 2026, the ability to create new legacy public apps via the Developer Platform UI will be permanently disabled. New public app development should use the Projects-based app platform instead.

Beginning May 26, 2026, the ability to create new legacy public apps via the Developer Platform UI will be permanently disabled. New public app development should use the Projects-based app platform.

deprecationappsdeveloper-platformmigration

Source: original entry ↗

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Security

HubSpot-hosted domains moving to TLS 1.2 minimum

HubSpot will automatically update the minimum TLS version for HubSpot-hosted domains from TLS 1.0 or 1.1 to TLS 1.2 on October 14th, enhancing security for all hosted domains.

securitytlsdomainsencryption
BreakingFall 2026

End of Support for v1-v3 APIs and Legacy Apps

HubSpot is ending support for v1-v3 APIs, legacy public apps, and legacy private apps effective September 2027. Customers and partners have a 12-month window from the announcement to migrate to supported alternatives.

apideprecationbreaking-changemigration
Announcement2026.09

Fall 2026 Spotlight - Developer and Builder Updates

HubSpot's Fall 2026 release introduces new features on Developer Platform 2026.09, including updated APIs, new beta APIs, and AI builder tools. This changelog covers non-breaking updates; see the separate breaking changes article for legacy API deprecations.

apideveloper-platformai-builderbeta
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