# What's New in Apollo Client 4.3

DevFeed: [What's New in Apollo Client 4.3](<https://devfeed.tech/articles/what-s-new-in-apollo-client-4-3-32028.md>)

Original publisher: [Read original article](<https://www.apollographql.com/blog/whats-new-in-apollo-client-4-3>)

Author: Jerel Miller

Published: 2026-09-15T12:01:05Z

Content type: release

Language: en

Sources: [Apollo Blog](<https://devfeed.tech/sources/apollo-blog.md>)

Topics: [apollo-client](<https://devfeed.tech/topics/apollo-client.md>), [GraphQL](<https://devfeed.tech/topics/graphql.md>), [TypeScript](<https://devfeed.tech/topics/typescript.md>), [Cache](<https://devfeed.tech/topics/cache.md>), [Code generation](<https://devfeed.tech/topics/code-generation.md>)

Tags: [apollo-client](<https://devfeed.tech/tags/apollo-client.md>), [cache](<https://devfeed.tech/tags/cache.md>), [codegen](<https://devfeed.tech/tags/codegen.md>), [graphql](<https://devfeed.tech/tags/graphql.md>), [native](<https://devfeed.tech/tags/native.md>), [typescript](<https://devfeed.tech/tags/typescript.md>)

## AI overview

Apollo Client 4.3 adds native custom scalar support, type-safe cache access, and improved TypeScript handling for incremental GraphQL data. The release also updates generated types and data-state narrowing for deferred fields.

## Source excerpt

Apollo Client 4.3 is here: native custom scalar support, type-safe cache access, and more consistent @defer and @stream behavior. See what's new and upgrade today.