Question 1

What happens when Svelte reaches end of life?

Accepted Answer

When Svelte reaches end of life, it stops receiving security patches, bug fixes, and new features. Currently, 4 Svelte versions are already EOL. The latest supported version is Svelte 5. Running an EOL version exposes your systems to unpatched security vulnerabilities with no official fix available.

Question 2

Is Svelte 5 still supported?

Accepted Answer

Yes. Svelte 5 is actively supported. It receives security patches and bug fixes. Check the version table above for the full list of supported Svelte releases and their exact end-of-life dates.

Question 3

Is it safe to use Svelte after end of life?

Accepted Answer

No. Running Svelte after EOL is not safe for production systems. Once a version reaches end of life, newly discovered CVEs are published publicly but never patched — leaving your systems permanently exposed. The only safe path is upgrading to an actively supported Svelte release.

Question 4

How to upgrade from Svelte 4 to Svelte 5.x?

Accepted Answer

To upgrade Svelte from 4 to 5: (1) review the official migration guide for breaking changes, (2) test your application against the new version in a staging environment, (3) update dependencies that have version constraints, (4) run your full test suite, (5) deploy with a rollback plan. The earlier you start, the more time you have to resolve compatibility issues before EOL.

Question 5

When is the next Svelte LTS version?

Accepted Answer

Not all Svelte releases have a designated LTS status. Check the version table above — LTS releases are marked with an "LTS" badge. Refer to the official Svelte release policy for information on upcoming long-term support versions.

Question 6

How long does Svelte support each version?

Accepted Answer

On average, Svelte supports each release for approximately 24 months (~2 years).  The exact EOL date for each version is listed in the table above.

Version	Released	Active support	EOL date	Until EOL	Latest	CVEs	Status
5	Oct 19, 2024	—	No	—	5.56.0	—	Active
4	Jun 22, 2023	Oct 19, 2024	Oct 19, 2024	598d ago	4.2.20	—	EOL
3	Apr 21, 2019	Jun 22, 2023	Jun 22, 2023	1083d ago	3.59.2	—	EOL
2	Apr 19, 2018	Apr 21, 2019	Apr 21, 2019	2606d ago	2.16.1	—	EOL
1	Nov 29, 2016	Apr 19, 2018	Apr 19, 2018	2973d ago	1.64.1	—	EOL

Svelte End of Life Dates

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