Kotlin 2.1 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Kotlin 2.1 reached end of life on 23 Jun 2025. It no longer receives security fixes.
412 days without security patches
Recommended action: upgrade to Kotlin 2.4. Check your versionkotlinc-native -version
Support timeline
Official dates from the Kotlin release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 27 Nov 2024 | — |
| End of life | 23 Jun 2025 | 1.1 years ago |
| Latest release | 2.1.21 · 13 May 2025 | final |
Where to go from 2.1
Recommended target: Kotlin 2.4.
The newest actively supported branch is Kotlin 2.4 (latest release 2.4.10).
Frequently asked questions
Is Kotlin 2.1 still safe to use?
Kotlin 2.1 reached end of life on 23 Jun 2025, 412 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Kotlin 2.1?
Yes — the final release (2.1.21) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Kotlin 2.1 to?
Upgrade to Kotlin 2.4, the newest actively supported branch.