What exactly does end-of-life mean?

No more security patches. A vulnerability found in your version after that date will no longer be fixed. Your site keeps running, but the risk is yours.

My site runs on Umbraco 13. How much time do I have?

You receive security patches until 14 December 2026, and none after that. Bug fixes already stopped on 14 December 2025.A migration is not something you plan from scratch in a few weeks: the inventory and migration plan take time. The earlier you start, the more room there is to decide what moves over, what gets rebuilt and what can go. What such a project costs is in what does an Umbraco migration cost?

What is the difference between LTS and STS?

An LTS version (Long Term Support) is supported for three years: 24 months of support, followed by 12 months of security only. An STS version (Standard Term Support) roughly a year.For most organisations only the LTS line is relevant. Umbraco releases a new LTS shortly after a new .NET LTS ships.

What happens if I keep running after end-of-life?

The site simply keeps working. The risk is in security and compliance: you no longer receive patches, and for anyone subject to certifications or vendor requirements, a CMS outside support is often simply not allowed.

Umbraco offers Extended Long Term Support: security patches for 6, 12 or 24 months after the EOL date. That buys time, but solves nothing. Your underlying .NET version and your packages keep aging in the meantime, and the step you're postponing only gets bigger.

Which version should I migrate to?

Umbraco 17. It is the current LTS, runs on .NET 10 and is supported until 27 November 2028. We migrate from any version to 17 — including from 8 or 10.

Umbraco 13 reaches end-of-life on 14 December 2026

How long will your Umbraco version be supported?

Umbraco 13 reaches end-of-life on 14 December 2026. If your site runs on 13, you will no longer receive security patches from that moment on. Since 14 December 2025 you already receive no bug fixes at all — security only.

Almost every other version has already expired. Umbraco 17 is the current LTS and is supported until 27 November 2028.

Support per Umbraco version

Version	Type	Released	End-of-life	Status
Umbraco 7	—	21 November 2013	30 September 2023	Expired
Umbraco 8	—	26 February 2019	24 February 2025	Expired
Umbraco 9	STS	29 September 2021	16 December 2022	Expired
Umbraco 10	LTS	16 June 2022	16 June 2025	Expired
Umbraco 11	STS	1 December 2022	1 December 2023	Expired
Umbraco 12	STS	29 June 2023	29 June 2024	Expired
Umbraco 13	LTS	14 December 2023	14 December 2026	Security phase: security patches only
Umbraco 14	STS	30 May 2024	30 May 2025	Expired
Umbraco 15	STS	14 November 2024	14 November 2025	Expired
Umbraco 16	STS	12 June 2025	12 June 2026	Expired
Umbraco 17	LTS	27 November 2025	27 November 2028	Fully supported (.NET 10)
Umbraco 18	STS	25 June 2026	25 June 2027	Supported

Source: Umbraco LTS & EOL. An LTS version gets three years: 24 months of support with bug fixes and security, followed by 12 months of security only.

Frequently asked questions

: No more security patches. A vulnerability found in your version after that date will no longer be fixed. Your site keeps running, but the risk is yours.
: You receive security patches until 14 December 2026, and none after that. Bug fixes already stopped on 14 December 2025.
A migration is not something you plan from scratch in a few weeks: the inventory and migration plan take time. The earlier you start, the more room there is to decide what moves over, what gets rebuilt and what can go. What such a project costs is in what does an Umbraco migration cost?
: An LTS version (Long Term Support) is supported for three years: 24 months of support, followed by 12 months of security only. An STS version (Standard Term Support) roughly a year.
For most organisations only the LTS line is relevant. Umbraco releases a new LTS shortly after a new .NET LTS ships.
: The site simply keeps working. The risk is in security and compliance: you no longer receive patches, and for anyone subject to certifications or vendor requirements, a CMS outside support is often simply not allowed.
: Umbraco offers Extended Long Term Support: security patches for 6, 12 or 24 months after the EOL date. That buys time, but solves nothing. Your underlying .NET version and your packages keep aging in the meantime, and the step you're postponing only gets bigger.
: Umbraco 17. It is the current LTS, runs on .NET 10 and is supported until 27 November 2028. We migrate from any version to 17 — including from 8 or 10.