Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.12.0 #651

2026-10-21T04:01:29+02:00

bot commented

2026-10-21 04:01:29 +02:00

This PR contains the following updates:

Package	Type	Update	Change
org.jetbrains.kotlinx:kotlinx-serialization-json	dependencies	minor	`1.11.0` → `1.12.0`

Release Notes

Kotlin/kotlinx.serialization (org.jetbrains.kotlinx:kotlinx-serialization-json)

`v1.12.0`

===================

This release is based on Kotlin 2.4.10 and contains all of the changes from 1.12.0-RC.

Additionally, it includes a fix removing unnecessary leading whitespaces from Proguard rules (#3270),
and two changes stabilizing kotlin.uuid.Uuid serializer (#3263) and kotlin.time.Instant serializers (#3261).

For your convenience, the changelog for 1.12.0-RC is duplicated below:

API stabilization and deprecations

A big portion of the Json and Core APIs has been stabilized. Most important ones include:
@KeepGeneratedSerializer and @SerialInfo annotations, JsonNamingStrategy, and ContextualSerializer.
Additionally, various descriptor builders such as listDescriptor and JsonElementBuilder's addAll functions are also
stable and can be freely used. There is also one deprecation: ChunkedDecoder interface. Since there is no demand for
it, we plan to remove it in the future. See details in
the #3238, #3239,
and #3216.

Also, kotlin.time.Instant and kotlin.uuid.Uuid serializers are no longer annotated with experimental annotations
from the Kotlin standard library (see [#3261](#3261
and #3263)

Performance improvements

We also improved performance in various areas. ASCII-specific parser
(#3225) brings performance of decoding from Okio and
kotlinx-io sources closer to decoding performance from
String. #3220 makes decoding significantly faster in case
JsonElement present in your serializable classes.
And #3248 should bring overall performance improvements
(up to 30%) on large strings.

Exceptions rework

We continue to improve exception handling in Json encoders and decoders.
#3235 makes a big change around custom serializers and
@Serializable classes constructors:
from now on, every exception thrown during deserialization is wrapped by decoder into a JsonException. This way, it is
more predictable to write a catch and it is easier to understand what went wrong:
JsonDecodingException also includes context information such as Json path and input. Besides
that, #3246 limits maximum nesting depth of Json
document, so you will get a proper JsonDecodingException instead of a random stack overflow error.

CBOR improvements

CBOR format also gets many improvements in this release. The most important one is memory optimization for
definitely-sized collections (#3191, #3192).

The others include:

Encode unsigned integer types as positive integers (#3194) (thanks to Eyüp Can Akman)
Correctly decode CborLabel values (#3195)
Include actual tag info into CborDecodingException (#3197)

Protobuf improvements

Protocol buffers format received a big new feature: support for unknown fields. Using a new ProtoUnknownFieldHolder
class, you can now decode and store unknown fields in Protobuf messages to retransmit them back later. See documentation
updates and #2860 for details. Big thanks
to xzk for theirs contributions:
this one and the bug with oneof default value (#3147).

We've also fixed Protobuf schema generation for inlined value classes (#3209).

Other improvements and bugfixes

Set Deprecated (HIDDEN) to setters in JsonConfiguration
Add Json nesting depth calculation during parsing (#3246)
JsonElementBuilders: mark all (add|put)Json (Object|Array) functions as inline (#3242) (thanks to Miha-x64)
Fix Polymorphic Deserialization Error with Subclass using JsonTransformingSerializer (#3139) (thanks to YongJun Jung)
Align collections' SerialDescriptors with the contract (#3199)
Remove leading whitespace from Proguard rules (#3270)

Configuration

📅 Schedule: (UTC)

Branch creation
- "every weekday,every weekend"
Automerge
- "every weekend"

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

If you want to rebase/retry this PR, check this box

This PR has been generated by Mend Renovate.

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [org.jetbrains.kotlinx:kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) | dependencies | minor | `1.11.0` → `1.12.0` | --- ### Release Notes <details> <summary>Kotlin/kotlinx.serialization (org.jetbrains.kotlinx:kotlinx-serialization-json)</summary> ### [`v1.12.0`](https://github.com/Kotlin/kotlinx.serialization/blob/HEAD/CHANGELOG.md#1120--2026-10-19) \=================== This release is based on Kotlin 2.4.10 and contains all of the changes from 1.12.0-RC. Additionally, it includes a fix removing unnecessary leading whitespaces from Proguard rules ([#3270](https://github.com/Kotlin/kotlinx.serialization/issues/3270)), and two changes stabilizing `kotlin.uuid.Uuid` serializer ([#3263](https://github.com/Kotlin/kotlinx.serialization/issues/3263)) and `kotlin.time.Instant` serializers ([#3261](https://github.com/Kotlin/kotlinx.serialization/issues/3261)). > For your convenience, the changelog for 1.12.0-RC is duplicated below: #### API stabilization and deprecations A big portion of the Json and Core APIs has been stabilized. Most important ones include: `@KeepGeneratedSerializer` and `@SerialInfo` annotations, `JsonNamingStrategy`, and `ContextualSerializer`. Additionally, various descriptor builders such as `listDescriptor` and JsonElementBuilder's `addAll` functions are also stable and can be freely used. There is also one deprecation: `ChunkedDecoder` interface. Since there is no demand for it, we plan to remove it in the future. See details in the [#3238](https://github.com/Kotlin/kotlinx.serialization/issues/3238), [#3239](https://github.com/Kotlin/kotlinx.serialization/issues/3239), and [#3216](https://github.com/Kotlin/kotlinx.serialization/issues/3216). Also, `kotlin.time.Instant` and `kotlin.uuid.Uuid` serializers are no longer annotated with experimental annotations from the Kotlin standard library (see \[[#3261](https://github.com/Kotlin/kotlinx.serialization/issues/3261)]\([#3261](https://github.com/Kotlin/kotlinx.serialization/pull/3261) and [#3263](https://github.com/Kotlin/kotlinx.serialization/pull/3263)) #### Performance improvements We also improved performance in various areas. ASCII-specific parser ([#3225](https://github.com/Kotlin/kotlinx.serialization/issues/3225)) brings performance of decoding from Okio and kotlinx-io sources closer to decoding performance from String. [#3220](https://github.com/Kotlin/kotlinx.serialization/issues/3220) makes decoding significantly faster in case `JsonElement` present in your serializable classes. And [#3248](https://github.com/Kotlin/kotlinx.serialization/issues/3248) should bring overall performance improvements (up to 30%) on large strings. #### Exceptions rework We continue to improve exception handling in Json encoders and decoders. [#3235](https://github.com/Kotlin/kotlinx.serialization/issues/3235) makes a big change around custom serializers and `@Serializable` classes constructors: from now on, every exception thrown during deserialization is wrapped by decoder into a `JsonException`. This way, it is more predictable to write a `catch` and it is easier to understand what went wrong: `JsonDecodingException` also includes context information such as Json path and input. Besides that, [#3246](https://github.com/Kotlin/kotlinx.serialization/issues/3246) limits maximum nesting depth of Json document, so you will get a proper `JsonDecodingException` instead of a random stack overflow error. #### CBOR improvements CBOR format also gets many improvements in this release. The most important one is memory optimization for definitely-sized collections ([#3191](https://github.com/Kotlin/kotlinx.serialization/issues/3191), [#3192](https://github.com/Kotlin/kotlinx.serialization/issues/3192)). The others include: - Encode unsigned integer types as positive integers ([#3194](https://github.com/Kotlin/kotlinx.serialization/issues/3194)) (thanks to [Eyüp Can Akman](https://github.com/eyupcanakman)) - Correctly decode CborLabel values ([#3195](https://github.com/Kotlin/kotlinx.serialization/issues/3195)) - Include actual tag info into CborDecodingException ([#3197](https://github.com/Kotlin/kotlinx.serialization/issues/3197)) #### Protobuf improvements Protocol buffers format received a big new feature: support for unknown fields. Using a new `ProtoUnknownFieldHolder` class, you can now decode and store unknown fields in Protobuf messages to retransmit them back later. See documentation updates and [#2860](https://github.com/Kotlin/kotlinx.serialization/issues/2860) for details. Big thanks to [xzk](https://github.com/xiaozhikang0916) for theirs contributions: this one and the bug with `oneof` default value ([#3147](https://github.com/Kotlin/kotlinx.serialization/issues/3147)). We've also fixed Protobuf schema generation for inlined value classes ([#3209](https://github.com/Kotlin/kotlinx.serialization/issues/3209)). #### Other improvements and bugfixes - Set Deprecated (HIDDEN) to setters in JsonConfiguration - Add Json nesting depth calculation during parsing ([#3246](https://github.com/Kotlin/kotlinx.serialization/issues/3246)) - JsonElementBuilders: mark all (add|put)Json (Object|Array) functions as inline ([#3242](https://github.com/Kotlin/kotlinx.serialization/issues/3242)) (thanks to [Miha-x64](https://github.com/Miha-x64)) - Fix Polymorphic Deserialization Error with Subclass using JsonTransformingSerializer ([#3139](https://github.com/Kotlin/kotlinx.serialization/issues/3139)) (thanks to [YongJun Jung](https://github.com/oungsi2000)) - Align collections' SerialDescriptors with the contract ([#3199](https://github.com/Kotlin/kotlinx.serialization/issues/3199)) - Remove leading whitespace from Proguard rules ([#3270](https://github.com/Kotlin/kotlinx.serialization/pull/3270)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - "every weekday,every weekend" - Automerge - "every weekend" 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

bot added 1 commit 2026-10-21 04:01:29 +02:00

Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.12.0 32e4f4ade8

bot scheduled this pull request to auto merge when all checks succeed 2026-10-21 04:01:30 +02:00

bot merged commit 41e2ad39fc into main

2026-10-21 04:01:31 +02:00

bot deleted branch renovate/org.jetbrains.kotlinx-kotlinx-serialization-json-1.x

2026-10-21 04:01:32 +02:00

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Reference: helcel/beans#651