# HubSpot for Developers changelog > API, SDK and app-platform changes for developers building on HubSpot. - Vendor: HubSpot - Category: Developer Tools - Official site: https://developers.hubspot.com - Tracked by: What's New (https://whatsnew.fyi/product/hubspot-developers) - Harvested from: Blog (https://developers.hubspot.com/changelog/rss.xml) - Entries below: 10 (newest first) What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'. ## Releases ### Breaking Change: CRM API Write Validation Enforcement Starting with the 2026-09 API Version - Date: 2026-08-11 - Original notes: https://developers.hubspot.com/changelog/crm-api-write-validation-enforcement - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-08-11-breaking-change-crm-api-write-validation-enforcem Starting with the /2026-09/ API version shipping on September 8, 2026, HubSpot will enforce admin-configured validation rules on all CRM API write paths. If your integration creates or updates CRM rec… - **changed** — CRM API write paths will enforce admin-configured validation rules starting with the /2026-09/ API version on September 8, 2026 ### July 2026 Rollup - Date: 2026-07-31 - Original notes: https://developers.hubspot.com/changelog/july-2026-rollup - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-07-31-july-2026-rollup This month's updates include a raised owner property limit, larger Webhooks Journal batch sizes, and a new historical API usage chart — plus public betas for Contract Imports and the Payment Links API… - **changed** — Raise owner property limit - **changed** — Increase Webhooks Journal batch sizes - **added** — Add new historical API usage chart - **added** — Introduce public beta for Contract Imports - **added** — Introduce public beta for Payment Links API ### Breaking Change: Pipeline and pipeline stage delete endpoints will validate references by default starting with the 2026-09 API version - Date: 2026-07-21 - Original notes: https://developers.hubspot.com/changelog/pipeline-stage-validation-true - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-07-21-breaking-change-pipeline-and-pipeline-stage-delet 7/23/2026 Edit - The post has been updated to include the Deal object specific validateDealStageUsagesBeforeDelete query parameter. Availability: This is a breaking change for the next GA date-based A… - **changed** — Pipeline and pipeline stage delete endpoints will validate references by default starting with the 2026-09 API version - **added** — Deal object now supports validateDealStageUsagesBeforeDelete query parameter ### Developer updates for June 2026 - Date: 2026-06-29 - Original notes: https://developers.hubspot.com/changelog/june-2026-rollup - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-06-29-developer-updates-for-june-2026 June’s developer updates include new CRM and customer success signals, cleaner subscription-status histories, expanded Knowledge Vault support for structured data, app object activity association cont… - **added** — New CRM and customer success signals - **added** — Expanded Knowledge Vault support for structured data - **changed** — Cleaner subscription-status histories ### HubSpot Agent CLI available in public beta - Date: 2026-06-23 - Original notes: https://developers.hubspot.com/changelog/hubspot-agent-cli-available-in-public-beta - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-06-23-hubspot-agent-cli-available-in-public-beta The HubSpot Agent CLI is a new command-line interface purpose-built for AI agents to interact with your HubSpot CRM data — reading records, running searches, creating and updating objects, managing pi… - **added** — HubSpot Agent CLI is available in public beta as a new command-line interface purpose-built for AI agents to interact with HubSpot CRM data including reading records, running searches, and creating and updating objects ### Updated SDKs for Date-based Versioning - Date: 2026-06-10 - Original notes: https://developers.hubspot.com/changelog/updated-sdks-for-date-based-versioning - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-06-10-updated-sdks-for-date-based-versioning We’ve improved our SDK releases to support date-based API versioning, the new /YYYY-MM/ format introduced across HubSpot’s APIs. Generated from a centrally managed API specification, SDKs now cover mo… - **added** — Support for date-based API versioning in the /YYYY-MM/ format across HubSpot's SDKs - **changed** — SDKs are now generated from a centrally managed API specification ### May 2026 Rollup - Date: 2026-05-28 - Original notes: https://developers.hubspot.com/changelog/may-2026-rollup - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-05-28-may-2026-rollup This month brings a set of updates aimed at making everyday building better. Breeze Assistant steps further into your workflows, a new useCrmSearch hook shipped for UI extensions, stage calculated pro… - **added** — Breeze Assistant now integrates deeper into workflows - **added** — New useCrmSearch hook shipped for UI extensions ### Deprecating Support for HubSpot v4 APIs - Date: 2026-05-21 - Original notes: https://developers.hubspot.com/changelog/deprecating-support-for-hubspot-v4-apis - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-05-21-deprecating-support-for-hubspot-v4-apis On March 30, 2027, HubSpot v4 APIs will move to an unsupported state. After that date, v4 APIs will no longer receive updates, bug fixes, or stability guarantees from HubSpot. - **deprecated** — HubSpot v4 APIs will move to an unsupported state on March 30, 2027, and will no longer receive updates, bug fixes, or stability guarantees ### v1 OAuth API Deprecation - Date: 2026-05-12 - Original notes: https://developers.hubspot.com/changelog/v1-oauth-api-deprecation - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-05-12-v1-oauth-api-deprecation We have introduced the latest date-based, versioned OAuth AP I for token issuance and introspection, as announced previously here . As adoption of the new OAuth API grows, we are beginning to deprecat… - **deprecated** — The OAuth API for token issuance and introspection is being deprecated in favor of the new date-based, versioned OAuth API ### App Listing and App Certification Requirement Updates for May 2026 - Date: 2026-05-07 - Original notes: https://developers.hubspot.com/changelog/app-listing-and-app-certification-requirement-updates-for-may-2026 - Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-05-07-app-listing-and-app-certification-requirement-upd We're updating the requirements for listed and certified apps in the HubSpot Marketplace to align with current platform standards and deprecations. These updates ensure that apps stay compatible with…