Support from Umbraco
Since January 2022, Umbraco offers two phases for major updates. The first phase is called the "support phase." During this phase, bugs and security issues are addressed. This phase lasts 9 months for regular updates and 24 months for LTS versions like Umbraco 10. After this phase, the "security phase" begins, during which only security issues are addressed. This phase lasts 9 months for important variants and 12 months for LTS updates. Therefore, an LTS version of Umbraco guarantees 36 months of support without changes that could break the website.