---
title: "Sanity React App SDK instances are no longer disposed on unmount: 2026-09-29 | Harbyn"
description: "Sanity React App SDK instances are no longer disposed on unmount, announced Sep 29, 2026."
canonical: "https://harbyn.com/changes/sanity/2026-09-29-instances-are-no-longer-disposed-on-unmount"
last-updated: 2026-10-09
---

# Sanity React App SDK instances are no longer disposed on unmount

Markdown version of <https://harbyn.com/changes/sanity/2026-09-29-instances-are-no-longer-disposed-on-unmount>.

Behavior change - Sanity. low severity. In effect.

In Sanity React App SDK v3.6.0, SanityApp and ResourceProvider no longer dispose their Sanity instance on unmount; the instance and its stores live until the page reloads. Code that relied on unmounting for cleanup, such as tests, should create the instance itself, render SanityApp inside SanityInstanceProvider and call instance.dispose().

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Sanity](https://harbyn.com/vendors/sanity.md) |
| Kind | Behavior change |
| Severity | low |
| Status | In effect |
| Announced | Sep 29, 2026 |
| Added to Harbyn | Oct 9, 2026 |
| Lead time | No dated deadline |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Sanity, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://www.sanity.io/docs/changelog> (changelog, fetched 2026-10-09 06:16 UTC, sha256 `bb011657338845a21c479c3499e96043951050652e891382d04b8ce5e721c154`)

## Related changes

### More from Sanity

- [React App SDK keeps and retries edits when saving fails](https://harbyn.com/changes/sanity/2026-09-29-edits-are-kept-and-retried-when-saving-fails.md) (Behavior change, announced Sep 29, 2026)
- [MCP server renames media\_assets\_upload\_from\_url and the old name no longer uploads](https://harbyn.com/changes/sanity/2026-10-01-upload-local-files-and-chatgpt-attachments-to-datasets.md) (Breaking change, announced Oct 1, 2026)
- [MCP server upload tools change their inputs and responses](https://harbyn.com/changes/sanity/2026-10-02-manage-and-upload-media-library-assets-with-mcp.md) (Breaking change, announced Oct 2, 2026)
- [MCP server removes the dataset\_assets\_upload tool](https://harbyn.com/changes/sanity/2026-10-16-retire-cli-only-asset-uploads.md) (Breaking change, announced Oct 16, 2026)

### Changes at other vendors

- [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026)
- [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026)
- [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026)
- [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027)

[All upcoming deadlines](https://harbyn.com/deadlines.md)