Sourced from mongoose's releases.

9.0.1 / 2025-12-05

• perf: use native Buffer.equals() for buffer comparison #15821 AbdelrahmanHafez
• fix(model): fix overwriteImmutable not working with timestamps: true, add overwriteImmutable types re #15781 #15819 AbdelrahmanHafez
• fix(bulkWrite): pass overwriteImmutable option to castUpdate fixes #15782 #15781 jhaayushkumar
• fix(schema): Add enumValues property to Number enum for consistency with String enum #15824 AkaHarshit
• fix: incorrect variable bug in double casting #15849 #15848 lomesh2312
• fix: clear timeout in collection operations #15852 techcodie
• types(query+model): use function overrides instead of | Query<any, any> to support using Query as filter #15791 #15779
• docs(migrating_to_9): clarify removing next() from pre middleware #15813
• docs: add dark mode support and CSS improvements #15753
• docs: Mongoose compatibility page updates #15797 alexbevi
• docs: Add closing backticks to code block in migration guide #15783 isnifer
• docs: fix documentation link in connection.js #15804 salittle0

9.0.0 / 2025-11-21

• BREAKING CHANGE: drop support for callback-based pre middleware, e.g. next() in pre() hooks
• BREAKING CHANGE: update to MongoDB Node driver v7
• BREAKING CHANGE: make UUID schema type return bson UUIDs #15378
• BREAKING CHANGE: make findOne(null), find(null), etc. throw an error instead of returning first doc #15019 #14948
• BREAKING CHANGE: disallow update pipelines by default, require updatePipeline option #15586 #14424
• BREAKING CHANGE: call virtual ref function with subdoc, not top-level doc #14652 #12440 #12363
• BREAKING CHANGE(types): make create() and insertOne() params more strict, remove generics to prevent type inference #15587 #15355
• BREAKING CHANGE(types): make FilterQuery properties no longer resolve to any in TypeScript #15422
• BREAKING CHANGE(types): change this to HydratedDocument for default() and required(), HydratedDocument | Query for validate() #15020 #14696
• BREAKING CHANGE(types): make id a virtual in TypeScript rather than a property on Document base class #15572 #13079
• BREAKING CHANGE(types): consolidate RootQuerySelector, Condition, etc. types with MongoDB driver's #15593
• BREAKING CHANGE: asyncify update validators, SchemaType.prototype.doValidate(), save hooks for improved stack traces #15312
• BREAKING CHANGE: remove bson as direct dependency, use mongodb/lib/bson instead #15576 #15154
• BREAKING CHANGE: remove _executionStack, make validate() async function and call Kareem hooks directly vs through wrappers #15298 #14906
• BREAKING CHANGE: remove browser build, move to @​mongoosejs/browser instead #15385 #15296
• BREAKING CHANGE: remove schematype caster and casterConstructor properties in favor of embeddedSchemaType and Constructor #15513 #15179
• BREAKING CHANGE: adding missing pluralizations, fixing pluralization: virus -> viruses #14247 ItsBradyDavis
• BREAKING CHANGE: remove connection noListener option #15641 #15640
• feat(types): add Schema.create() for TypeScript type inference #15482 #14954
• chore: remove examples directory #15597

9.0.0-rc1 / 2025-11-19

• fix(populate): correctly populate embedded discriminators on subdocuments #15774

9.0.0-rc0 / 2025-11-19

• BREAKING CHANGE: drop support for callback-based pre middleware, e.g. next() in pre() hooks
• BREAKING CHANGE: update to MongoDB Node driver v7
• BREAKING CHANGE: make UUID schema type return bson UUIDs #15378
• BREAKING CHANGE: make findOne(null), find(null), etc. throw an error instead of returning first doc #15019 #14948
• BREAKING CHANGE: disallow update pipelines by default, require updatePipeline option #15586 #14424
• BREAKING CHANGE: call virtual ref function with subdoc, not top-level doc #14652 #12440 #12363

... (truncated)

Sourced from mongoose's changelog.

9.0.1 / 2025-12-05

• perf: use native Buffer.equals() for buffer comparison #15821 AbdelrahmanHafez
• fix(model): fix overwriteImmutable not working with timestamps: true, add overwriteImmutable types re #15781 #15819 AbdelrahmanHafez
• fix(bulkWrite): pass overwriteImmutable option to castUpdate fixes #15782 #15781 jhaayushkumar
• fix(schema): Add enumValues property to Number enum for consistency with String enum #15824 AkaHarshit
• fix: incorrect variable bug in double casting #15849 #15848 lomesh2312
• fix: clear timeout in collection operations #15852 techcodie
• types(query+model): use function overrides instead of | Query<any, any> to support using Query as filter #15791 #15779
• docs(migrating_to_9): clarify removing next() from pre middleware #15813
• docs: add dark mode support and CSS improvements #15753
• docs: Mongoose compatibility page updates #15797 alexbevi
• docs: Add closing backticks to code block in migration guide #15783 isnifer
• docs: fix documentation link in connection.js #15804 salittle0

8.20.2 / 2025-12-05

• fix(model): bump version if necessary after successful bulkSave() #15809 #15800
• fix(bulkWrite): pass overwriteImmutable option to castUpdate fixes #15789 #15782 #15781
• types(schema): allow calling schema.static() with as TStatics #15794 #15780

7.8.8 / 2025-12-04

• fix(bulkWrite): pass overwriteImmutable option to castUpdate fixes #15789 #15782 #15781
• fix(model): bump version if necessary after successful bulkSave() #15800

9.0.0 / 2025-11-21

• BREAKING CHANGE: drop support for callback-based pre middleware, e.g. next() in pre() hooks
• BREAKING CHANGE: update to MongoDB Node driver v7
• BREAKING CHANGE: make UUID schema type return bson UUIDs #15378
• BREAKING CHANGE: make findOne(null), find(null), etc. throw an error instead of returning first doc #15019 #14948
• BREAKING CHANGE: disallow update pipelines by default, require updatePipeline option #15586 #14424
• BREAKING CHANGE: call virtual ref function with subdoc, not top-level doc #14652 #12440 #12363
• BREAKING CHANGE(types): make create() and insertOne() params more strict, remove generics to prevent type inference #15587 #15355
• BREAKING CHANGE(types): make FilterQuery properties no longer resolve to any in TypeScript #15422
• BREAKING CHANGE(types): change this to HydratedDocument for default() and required(), HydratedDocument | Query for validate() #15020 #14696
• BREAKING CHANGE(types): make id a virtual in TypeScript rather than a property on Document base class #15572 #13079
• BREAKING CHANGE(types): consolidate RootQuerySelector, Condition, etc. types with MongoDB driver's #15593
• BREAKING CHANGE: asyncify update validators, SchemaType.prototype.doValidate(), save hooks for improved stack traces #15312
• BREAKING CHANGE: remove bson as direct dependency, use mongodb/lib/bson instead #15576 #15154
• BREAKING CHANGE: remove _executionStack, make validate() async function and call Kareem hooks directly vs through wrappers #15298 #14906
• BREAKING CHANGE: remove browser build, move to @​mongoosejs/browser instead #15385 #15296
• BREAKING CHANGE: remove schematype caster and casterConstructor properties in favor of embeddedSchemaType and Constructor #15513 #15179
• BREAKING CHANGE: adding missing pluralizations, fixing pluralization: virus -> viruses #14247 ItsBradyDavis
• BREAKING CHANGE: remove connection noListener option #15641 #15640
• feat(types): add Schema.create() for TypeScript type inference #15482 #14954
• chore: remove examples directory #15597

8.20.1 / 2025-11-20

... (truncated)

• adb3a5e chore: release 9.0.1
• 1b72648 docs(migrating_to_9): clarify removing next() from pre middleware
• 7a15ea5 Merge branch '8.x'
• 0275815 correct publish step name
• 8d0f22f chore: release 8.20.2
• 1164312 chore: publish with tag 8x from 8.x branch
• cb13354 fix lint
• e97a0da fix overwriteImmutable option lost in merge conflict
• 63df6c4 Merge pull request #15852 from techcodie/fix-collection-timeout-memory-leak
• b7794d1 Merge pull request #15876 from Automattic/fix-ci
• Additional commits viewable in compare view

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