Choose your server version
The package uses Java 21 and Paper/Folia 1.21.11 as its baseline. Minecraft 26.1+ needs Java 25. Boot smoke tests on newer Paper/Folia builds are not full gameplay certification.
Use each plugin’s Guide for requirements and dependencies. Atlas has version-sensitive features and is not certified for 26.x in this package. Live gameplay, economy, packet and multi-server combinations still require validation.
Back up data and test an upgrade on a separate server before replacing a working installation.