Today the Ember project is releasing version 4.6 of Ember.js, Ember Data, and Ember CLI.
This release kicks off the 4.7 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 4.6
Ember.js 4.6 is an incremental, backwards compatible release of Ember with bug fixes.
Bug Fixes
Ember.js 4.6 introduced 2 bug fixes.

• Replace deprecated substr() method with substring() method
• Adjust uniqueId() implementation to only generate valid selectors. querySelector does not work if the first character is a number, so
  now we ensure that the first character is a letter.

Features
Ember.js 4.6 introduced 0 features.
Deprecations
Ember.js 4.6 introduced 0 deprecations.
For more details on changes in Ember.js 4.6, please review the Ember.js 4.6.0 release page.

Ember Data
Ember Data is the official data persistence library for Ember.js applications.
Changes in Ember Data
The Ember Data team has multiple releases to announce! We will go through them
one by one in the section below.
Firstly, Ember CLI's blueprints for creating new apps and upgrading existing apps
still point to v4.4 of Ember Data. If you want to take advantage of the progress
described below, update the version number in your package.json after completing
your upgrade.
Now let's cover what is in v4.5 and v4.6. These two versions are identical.
The aim is to catch up to the versioning number of Ember CLI and Ember.js.
Version 4.5 includes a number of new deprecations, a significant internal refactoring of the store architecture and several bug fixes described below.
Node support
v4.5 of Ember Data drops support for Node 12. Node 12 became end of life (it no longer receives security updates) in April 2022.
Bug Fixes
Ember Data 4.5 introduced 9 bug fixes. Additional Details are in the release notes.

• #8083 [BUGFIX] Serialize null array items as empty strings
• #7901 waiter should be always on
• #8042 RecordState cleanup
• #8008 schedule watchTypeIfUnseen to prevent loop
• #8013 Fix generated import paths for test setup functions in addons
• #8025 Fix PromiseProxy Deprecation for Save (@runspired)
• #7902 test for async hasMany does not trigger relationship fetch
• Pass correct args to keyFor when normalizing
• #7945 fix for an issue with computed chains not updated for async hasMany loading

Features
Ember Data 4.5 introduced improvements to build size.
Users of solely the core of Ember Data, namely the store and ember-inflector packages, may expect the builds of those dependencies to be 35-50% smaller. This is due to most of the legacy support for @ember-data/model having now found its final location at home in that package instead of within the @ember-data/store package. The size of @ember-data/store is reduced from ~16kb compressed to ~9.5kb compressed, potentially a little less depending on what deprecations are resolved and what other packages are present. We expect the core to continue to shrink as we complete the final stages of removing InternalModel, complete implementations for recently accepted deprecation RFCs, and introduce RecordDataV2.
Deprecations
Ember Data 4.5 introduced 8 deprecations. Some private APIs have also
been deprecated or removed, and some methods deprecated during v3 of Ember are
now removed. For the full list of removed APIs, visit the release notes.
The new deprecations are below, and support for the deprecated APIs will be removed
in the next major version of Ember:

• deprecating some internal usage of RSVP.Promise that applications may have become dependent on if their tests are leaky. This was
  proposed in RFC 796
• deprecating the type property on snapshots (which would lookup the model class).
• deprecating store.find, a private method that has been maintained in case users accidentally fell into using ember's hidden autofetch behavior in routes
• deprecating store.hasRecordForId, as peekRecord is generally more useful and provides the same information (and more).
• deprecating store.recordWasInvalid, an unused internal api that ember-model-validations appears to be using.
• deprecating passing strings to the schema lookup functions attributesDefinitionFor and relationshipsDefinitionFor, these APIs now expect an object with at least a type property representing the model name.
• deprecating the -json-api fallback adapter, a hidden behavior that provided an adapter if the application failed to define one.

As always, deprecated code can be eliminated from the build output by specifying the compatWith arg on the emberData configuration in your app.
Private API removals
Users of private store APIs may find these APIs have now been deprecated or removed. Internal restructuring will be high the next 6 months as we polish off the removal of InternalModel and continue to simplify codepaths which that removal allows us to do. All but a few private methods have been entirely eliminated from the store.
For more details on changes in Ember Data 4.6, please review the
Ember Data 4.6.0 release page.

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 4.6
This version included some changes to Node support, a new deprecation,
some removals of previously deprecated code, and a
variety of internal cleanup and refactor efforts.
Node support
v4.5 of Ember CLI drops support for Node 12 and adds support for Node 18. Node 12 became end of life (it no longer receives security updates) in April 2022.
Bug Fixes
Ember CLI 4.6 introduced 0 bug fixes.
Features
Ember CLI 4.6 introduced 0 features.
Deprecations
Ember CLI 4.6 introduced 1 deprecation.
The vendor-shim blueprint is deprecated. Please use ember-auto-import instead.
In addition, some deprecations introduced in earlier major versions of
Ember have now been removed, including support for ember-cli-inject-live-reload, silent error, and addonJsFiles.
For more details on the changes in Ember CLI 4.6 and detailed upgrade
instructions, please review the Ember CLI 4.6.0 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.