# Micronaut: what changed from 3 to 5

- Product: Micronaut (https://whatsnew.fyi/product/micronaut)
- Vendor: Micronaut Foundation
- Range: changelog entries numbered after v3.10.10 up to and including v5.1.13, stable releases only
- Entries below: 12 releases (newest first)
- Resolved: 3 is v3.10.10 and 5 is v5.1.13, the newest stable release of each major we track
- Carrying security changes: 2 · CVEs mentioned: 0 · Mentioning breaking changes: 0 · Removing or deprecating something: 0
- Page: https://whatsnew.fyi/product/micronaut/compare/3...5

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## What changed (33 changes, grouped by kind)

### Added

#### v5.1.12 (2026-08-21)

- Add Sec-Fetch-* HTTP Headers

#### v5.1.11 (2026-08-17)

- Add SCIM JSON media type support

#### v5.1.6 (2026-07-13)

- Add shared trailing slash trimming utility

### Changed

#### v5.1.13 (2026-08-28)

- Update reactor to 3.8.7

#### v5.1.12 (2026-08-21)

- Document piped stream limitations for streamed responses

#### v5.1.11 (2026-08-17)

- Update netty monorepo to v4.2.17.Final
- Update netty-tcnative to 2.0.81.Final

#### v5.1.7 (2026-07-17)

- Use exclusive service loader strategy and fix GraalVM warnings

#### v5.1.6 (2026-07-13)

- Use configuration properties for logger levels
- Enable SSL by default for per-service client SSL configuration
- Handle invalid zone id conversion

#### v5.1.4 (2026-07-08)

- Update logback-classic to v1.5.37
- Update Netty to 4.2.16.Final

### Fixed

#### v5.1.11 (2026-08-17)

- Replace reference equality with value equality in isAny and isAnyMethod in CORS
- Use case-insensitive Content-Type and Content-Length header matching in FormDemuxer
- Fix FormDemuxer event loop race
- Fix handling of inaccessible configuration properties in metadata

#### v5.0.7 (2026-07-23)

- Replace reference equality with value equality in isAny and isAnyMethod for CORS

#### v5.1.9 (2026-07-21)

- Fix processing replaced executable methods

#### v5.1.8 (2026-07-20)

- Fix method injection on AOP introduction proxies

#### v5.1.7 (2026-07-17)

- Fix introspection for private JsonProperty fields
- Fix factory beans in superclasses

#### v5.0.6 (2026-07-15)

- Fix regression @Replaces matching for proxied default implementations

#### v5.1.6 (2026-07-13)

- Resolve generic type arguments for suspend functions returning non-generic typealiases in KSP
- Handle null instances in QueryValueArgumentBinder
- Fix repeatable containers discovery
- Restore private nested client lookup
- Fix factory beans with scoped proxy

#### v5.1.5 (2026-07-09)

- Fix validation

#### v5.1.4 (2026-07-08)

- Ensure ByteBuf release during writes
- Track JRT file system for cleanup
- Fix introspection for generated Jackson models

### Security

#### v5.0.7 (2026-07-23)

- Update Jackson dependencies to patch security vulnerabilities (also in v5.1.10)

## Release notes

### v5.1.13 — Micronaut Core 5.1.13

- Date: 2026-08-28
- Version: v5.1.13
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.13
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.13

- **changed** — Update reactor to 3.8.7

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Dependency updates 🚀
* Update reactor to 3.8.7 by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12924


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.12...v5.1.13

### v5.1.12 — Micronaut Core 5.1.12

- Date: 2026-08-21
- Version: v5.1.12
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.12
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.12

- **added** — Add Sec-Fetch-* HTTP Headers
- **changed** — Document piped stream limitations for streamed responses

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Dependency updates 🚀
* Update groovy from 5.0.6 to 5.0.8. by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12885
###### Other Changes 💡
* Document piped stream limitations for streamed responses by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/12514
* Add Sec-Fetch-* HTTP Headers by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12899

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.11...v5.1.12

### v5.1.11 — Micronaut Core 5.1.11

- Date: 2026-08-17
- Version: v5.1.11
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.11
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.11

- **added** — Add SCIM JSON media type support
- **changed** — Update netty monorepo to v4.2.17.Final
- **changed** — Update netty-tcnative to 2.0.81.Final
- **fixed** — Replace reference equality with value equality in isAny and isAnyMethod in CORS
- **fixed** — Use case-insensitive Content-Type and Content-Length header matching in FormDemuxer
- **fixed** — Fix FormDemuxer event loop race
- **fixed** — Fix handling of inaccessible configuration properties in metadata

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
* Update netty monorepo to v4.2.17.Final ([#12876](https://github.com/micronaut-projects/micronaut-core/issues/12876))
###### Bug Fixes 🐞
* fix(cors): replace reference equality with value equality in isAny and isAnyMethod by @fatekingsama in https://github.com/micronaut-projects/micronaut-core/pull/12627
* fix(multipart): case-insensitive Content-Type/Content-Length header matching in FormDemuxer by @florian-3ap in https://github.com/micronaut-projects/micronaut-core/pull/12836
* [5.1.x] Update netty-tcnative to 2.0.81.Final by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/12890
* Fix FormDemuxer event loop race by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/12886
###### Improvements ⭐
* Add SCIM JSON media type support by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12835
* test: cover default application context resource loader validation by @amirdeljouyi in https://github.com/micronaut-projects/micronaut-core/pull/12774
* Use management refresh endpoint in CORS TCKs by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12880
###### Other Changes 💡
* Fix handle inaccessible configuration properties in metadata by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12882

##### New Contributors
* @florian-3ap made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12836
* @amirdeljouyi made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12774

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.10...v5.1.11

### v5.0.7 — Micronaut Core 5.0.7

- Date: 2026-07-23
- Version: v5.0.7
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.0.7
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.0.7

- **fixed** — Replace reference equality with value equality in isAny and isAnyMethod for CORS
- **security** — Update Jackson dependencies to patch security vulnerabilities

<!-- Release notes generated using configuration in .github/release.yml at 5.0.x -->

##### What's Changed
###### Bug Fixes 🐞
* fix(cors): replace reference equality with value equality in isAny and isAnyMethod by @fatekingsama in https://github.com/micronaut-projects/micronaut-core/pull/12627
* Update Jackson dependencies to patch security vulnerabilities ([#12834](https://github.com/micronaut-projects/micronaut-core/issues/12834))

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.0.6...v5.0.7

### v5.1.10 — Micronaut Core 5.1.10

- Date: 2026-07-22
- Version: v5.1.10
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.10
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.10

- **security** — Update Jackson dependencies to patch security vulnerabilities

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Dependency updates 🚀
* Update Jackson dependencies to patch security vulnerabilities by @radovanradic in https://github.com/micronaut-projects/micronaut-core/pull/12834

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.9...v5.1.10

### v5.1.9 — Micronaut Core 5.1.9

- Date: 2026-07-21
- Version: v5.1.9
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.9
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.9

- **fixed** — Fix processing replaced executable methods

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Bug Fixes 🐞
* Fix processing replaced executable methods by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12827


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.8...v5.1.9

### v5.1.8 — Micronaut Core 5.1.8

- Date: 2026-07-20
- Version: v5.1.8
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.8
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.8

- **fixed** — Fix method injection on AOP introduction proxies

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Dependency updates 🚀
* Bump managed-ksp version to 2.3.10 by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12822
###### Other Changes 💡
* Fix method injection on AOP introduction proxies by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12825


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.7...v5.1.8

### v5.1.7 — Micronaut Core 5.1.7

- Date: 2026-07-17
- Version: v5.1.7
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.7
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.7

- **fixed** — Fix introspection for private JsonProperty fields
- **changed** — Use exclusive service loader strategy and fix GraalVM warnings
- **fixed** — Fix factory beans in superclasses

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Bug Fixes 🐞
* Fix : introspection for private JsonProperty fields by @samikshathorat21 in https://github.com/micronaut-projects/micronaut-core/pull/12810
###### Improvements ⭐
* Use exclusive service loader strategy and fix GraalVM warnings by @graemerocher in https://github.com/micronaut-projects/micronaut-core/pull/12808
###### Other Changes 💡
* Fix factory beans in superclasses by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12821


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.6...v5.1.7

### v5.0.6 — Micronaut Core 5.0.6

- Date: 2026-07-15
- Version: v5.0.6
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.0.6
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.0.6

- **fixed** — Fix regression @Replaces matching for proxied default implementations

<!-- Release notes generated using configuration in .github/release.yml at 5.0.x -->

##### What's Changed
###### Regressions 🧐
* Fix regression @Replaces matching for proxied default implementations by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12796


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.0.5...v5.0.6

### v5.1.6 — Micronaut Core 5.1.6

- Date: 2026-07-13
- Version: v5.1.6
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.6
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.6

- **fixed** — Resolve generic type arguments for suspend functions returning non-generic typealiases in KSP
- **fixed** — Handle null instances in QueryValueArgumentBinder
- **fixed** — Fix repeatable containers discovery
- **changed** — Use configuration properties for logger levels
- **changed** — Enable SSL by default for per-service client SSL configuration
- **changed** — Handle invalid zone id conversion
- **added** — Add shared trailing slash trimming utility
- **fixed** — Restore private nested client lookup
- **fixed** — Fix factory beans with scoped proxy

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Bug Fixes 🐞
* fix(ksp): resolve generic type arguments for suspend functions returning non-generic typealiases (#12686) by @idsoke in https://github.com/micronaut-projects/micronaut-core/pull/12690
* Handle null instances in QueryValueArgumentBinder by @MaheshAravindV in https://github.com/micronaut-projects/micronaut-core/pull/12759
* Fix repeatable containers discovery by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12797
###### Improvements ⭐
* Use configuration properties for logger levels by @graemerocher in https://github.com/micronaut-projects/micronaut-core/pull/12752
* Enable SSL by default for per-service client SSL configuration by @MariusVolkhart in https://github.com/micronaut-projects/micronaut-core/pull/12773
* Handle invalid zone id conversion by @kali834x in https://github.com/micronaut-projects/micronaut-core/pull/12747
* Add shared trailing slash trimming utility by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12799
###### Other Changes 💡
* Restore private nested client lookup by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/12792
* Fix factory beans with scoped proxy by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12798

##### New Contributors
* @idsoke made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12690
* @MariusVolkhart made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12773
* @MaheshAravindV made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12759
* @kali834x made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/12747

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.5...v5.1.6

### v5.1.5 — Micronaut Core 5.1.5

- Date: 2026-07-09
- Version: v5.1.5
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.5
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.5

- **fixed** — Fix validation

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Other Changes 💡
* Fix validation by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12790

**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.4...v5.1.5

### v5.1.4 — Micronaut Core 5.1.4

- Date: 2026-07-08
- Version: v5.1.4
- Original notes: https://github.com/micronaut-projects/micronaut-core/releases/tag/v5.1.4
- Permalink: https://whatsnew.fyi/product/micronaut/releases/v5.1.4

- **fixed** — Ensure ByteBuf release during writes
- **fixed** — Track JRT file system for cleanup
- **fixed** — Fix introspection for generated Jackson models
- **changed** — Update logback-classic to v1.5.37
- **changed** — Update Netty to 4.2.16.Final

<!-- Release notes generated using configuration in .github/release.yml at 5.1.x -->

##### What's Changed
###### Improvements ⭐
* sonar: Suppress false stream warning in StreamPair by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12767
* Ensure ByteBuf release during writes by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12769
* Track JRT file system for cleanup by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12768
###### Dependency updates 🚀
* Update dependency ch.qos.logback:logback-classic to v1.5.37 by @renovate[bot] in https://github.com/micronaut-projects/micronaut-core/pull/12770
* Netty 4.2.16.Final by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12777
###### Other Changes 💡
* Suppress Sonar warning for EventLoopFlow checks by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/12766
* Fix introspection for generated Jackson models by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/12783


**Full Changelog**: https://github.com/micronaut-projects/micronaut-core/compare/v5.1.3...v5.1.4