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Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.12.0 - #17872

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This PR contains the following updates:

Package Change Age Confidence
org.jetbrains.kotlinx:kotlinx-serialization-json 1.11.0 → 1.12.0 age confidence

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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: (in timezone Europe/Berlin)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, 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 was generated by Mend Renovate. View the repository job log.

… v1.12.0

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
@renovate renovate Bot added 3. to review dependencies Pull requests that update a dependency file labels Oct 23, 2026
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renovate Bot enabled auto-merge (squash) October 23, 2026 23:56
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renovate Bot commented Oct 23, 2026

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

  • any of the package files in this branch needs updating, or
  • the branch becomes conflicted, or
  • you click the rebase/retry checkbox if found above, or
  • you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: gradle/libs.versions.toml
Command failed: ./gradlew -Dorg.gradle.jvmargs=-Xms512m -Xmx512m --console=plain --dependency-verification lenient -q --write-verification-metadata sha256,pgp dependencies

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.sdk.LicenceNotAcceptedException: Failed to install the following Android SDK packages as some licences have not been accepted.
     ndk;29.0.14206865 NDK (Side by side) 29.0.14206865
  To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
  All licenses can be accepted using the sdkmanager command line tool:
  sdkmanager --licenses
  Or, to transfer the license agreements from one workstation to another, see https://developer.android.com/studio/intro/update.html#download-with-gradle
  
  Using Android SDK: /home/ubuntu/.android-sdk

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.
==============================================================================

2: Task failed with an exception.
-----------
* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.sdk.LicenceNotAcceptedException: Failed to install the following Android SDK packages as some licences have not been accepted.
     ndk;29.0.14206865 NDK (Side by side) 29.0.14206865
  To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
  All licenses can be accepted using the sdkmanager command line tool:
  sdkmanager --licenses
  Or, to transfer the license agreements from one workstation to another, see https://developer.android.com/studio/intro/update.html#download-with-gradle
  
  Using Android SDK: /home/ubuntu/.android-sdk

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.
==============================================================================

BUILD FAILED in 3m 17s

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Codacy

SpotBugs

CategoryBaseNew
Bad practice2424
Correctness5151
Dodgy code158158
Experimental11
Malicious code vulnerability11
Multithreaded correctness2020
Performance2828
Security1515
Total298298

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