See Release Notes
Long Term Support Release

• Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
• Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
• PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.

• Moodle 4.1 Database Schema (by Marcus Green)