# Kotlin v2.4.20-RC3 — Kotlin 2.4.20-RC3

- Product: Kotlin (https://whatsnew.fyi/product/kotlin)
- Vendor: JetBrains
- Date: 2026-09-02
- Version: v2.4.20-RC3
- Original notes: https://github.com/JetBrains/kotlin/releases/tag/v2.4.20-RC3
- Permalink: https://whatsnew.fyi/product/kotlin/releases/v2.4.20-rc3
- Labels: Pre-release

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'.

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- **fixed** — Fixed ClassCastException caused by suspend conversion of nullable argument to nullable expected type

##### Changelog

###### Compiler

- [`KT-88953`](https://youtrack.jetbrains.com/issue/KT-88953) CCE caused by suspend conversion of nullable argument to nullable expected type