Today the Ember project is releasing version 4.7 of Ember.js, Ember Data, and Ember CLI.
This release kicks off the 4.8 beta cycle for all sub-projects. We encourage our community (especially addon authors) to help test these beta builds and report any bugs before they are published as a final release in six weeks' time. The ember-try addon is a great way to continuously test your projects against the latest Ember releases.
You can read more about our general release process here:

• Release Dashboard
• The Ember Release Cycle
• The Ember Project
• Ember LTS Releases

Ember.js
Ember.js is the core framework for building ambitious web applications.
Changes in Ember.js 4.7
Ember.js 4.7 is an incremental, backwards compatible release of Ember with bug fixes, performance improvements, and minor deprecations.
Bug Fixes
Ember.js 4.7 introduced 1 bug fix.

• Replacing Firefox detection that used a deprecated browser API

Features
Ember.js 4.7 introduced 0 features.
Deprecations
Ember.js 4.7 introduced 0 deprecations.

For more details on changes in Ember.js 4.7, please review the Ember.js 4.7.0 release page.

Ember Data
Ember Data is the official data persistence library for Ember.js applications.
Changes in Ember Data 4.7
Version 4.7 implements a "2.1" cache spec while deprecating the v1 cache spec. This spec differs somewhat from the original 2.0 RFC, an updated RFC specifying the modifications will be published soon. Users looking to migrate to the 2.1 cache should expect that the finalized version of 2.1 enforces that the cache is always a singleton (vs merely allowed to be a singleton), and that data provided to the store and queries to the store from the cache should always contain identifiers in their stable form. This latter point is enforced in 4.7, the former is not yet enforced.

Performance Improvements

Note: many performance improvements are gated by deprecation removal, meaning that you need to resolve all deprecations for EmberData 4.7 and mark your app as compatible with that version in order to opt in to the fastest codepaths.
All applications should observe significant speed improvements when using EmberData 4.7. The below call-outs are in relation to EmberData 4.6.

• Pushing new data into the cache is now ~33% faster
• Accessing the LiveArray (peekAll / findAll) for the first time is now 97% faster
• Initial Access of Related Records is now ~80% faster
• Destroying all records (e.g. also sending an API request) in a loop is 62% faster
• Unloading all records (of all types) is ~98% faster

Read more in the release notes.
Bug Fixes
Ember Data 4.7 introduced 8 bug fixes and some tests and documentation improvements. Additional details are in the release notes.

• #8089 Unpin yarn for consumers
• #8108 Fix earlier versions of node-14
• #8118 Reopen deprecation should properly pass original arguments
• #8113 Account for multi-options-per-identifer possibility
• #8109 Add optional polyfill for crypto.randomUUID
• #8116 Clear subscriptions once unsubscribed, don't unnecessarily churn on subscriptions
• #8128 backgroundReloads should not affect recordIsLoaded
• #8159 uuid polyfill logic (@runspired)

Features
Ember Data 4.7 introduced 2 features.

• #7955 Explicit Polymorphic Relationship Support emberjs/rfcs#793
• #8134 The return values of hasMany relationships, peekAll, findAll and query are now proxies to native arrays and as such all native array APIs are now usable. These objects will act fully as if they are native arrays. Restrictions on immutability of the result of peekAll and query still apply (RFC 846).

Deprecations
Ember Data 4.7 introduced 13 deprecations. Additional details are in the release notes.

• #8093 Implement helper deprecations (RFC 742).
• #8092 Deprecate Model.reopen/reopenClass and eager static fields lookups (implements RFC 738 and RFC 741).
• #8084 Eliminate InternalModel, nearly all private API's have undergone significant change, if your app previously used these APIs the most likely refactor is to use a custom model or a custom cache.
• #8115 Implement strict relationships (RFC 739).

For more details on changes in Ember Data 4.7, please review the
Ember Data 4.7.1 commits.

Ember CLI
Ember CLI is the command line interface for managing and packaging Ember.js applications.
Upgrading Ember CLI
You may upgrade Ember CLI using the ember-cli-update project:
npx ember-cli-update

This utility will help you to update your app or addon to the latest Ember CLI version. You will probably encounter merge conflicts, in which the default behavior is to let you resolve conflicts on your own. For more information on the ember-cli-update project, see the GitHub README.
While it is recommended to keep Ember CLI versions in sync with Ember and Ember Data, this is not required. After updating ember-cli, you can keep your current version(s) of Ember or Ember Data by editing package.json to revert the changes to the lines containing ember-source and ember-data.
Changes in Ember CLI 4.7
Bug Fixes
Ember CLI 4.7 introduced 1 bug fix.

• Rebuild failures no longer make the ember-cli process exit.

Features
Ember CLI 4.7 introduced 0 features.
Deprecations
Ember CLI 4.7 introduced 0 deprecations.
For more details on the changes in Ember CLI 4.7 and detailed upgrade
instructions, please review the Ember CLI 4.7.0 release page.
Thank You!
As a community-driven open-source project with an ambitious scope, each of these releases serves as a reminder that the Ember project would not have been possible without your continued support. We are extremely grateful to our contributors for their efforts.