Qubes OS 4.2 will reach its end of life on June 21, 2026, after which users will face unpatched vulnerabilities due to the cessation of security support. To upgrade to version 4.3, users can choose between a clean install that wipes customizations or an in-place upgrade that preserves existing setups, with each option having its own pros and cons. Staying on version 4.2 post-deadline poses significant security risks, as it will no longer receive any bug fixes or patches for newly discovered exploits. Users are urged to complete their upgrades before the deadline to maintain their security posture and protect against threats

Qubes OS 4.2 End of Life: How to Upgrade to 4.3 Safely

Qubes OS 4.2 officially drops all security support, leaving any lingering installations completely exposed to unpatched vulnerabilities. Users must migrate to version 4.3 through either a clean install that wipes dom0 customizations or an in-place upgrade tool designed to preserve them. The fresh installation route avoids technical headaches but forces a rebuild of modified settings, while the migration path keeps existing setups intact at the cost of navigating a fragile multi-stage process. Since every patch within the 4.2 branch shares the exact same expiration date, waiting past June guarantees running an unsupported system with zero maintenance backing it up.

Qubes OS 4.2 End of Life: How to Upgrade to 4.3 Safely @ Linux Compatible