Update checker

Since 1.21.11, Paper includes a built-in update checker that notifies server administrators on startup when a new version of Paper is available.

When the server starts, Paper will check its current version against the latest available version in the stable channel on the PaperMC servers. If a newer version is found, a notification message will be printed to the console and server logs.

Additionally, you can manually check for updates at any time by running the version command in the server console (or in-game with appropriate minecraft.command.version permissions).

The update checker sends the following information to the PaperMC servers:

• Current Paper version
• Your servers client IP (as for any http request)

This information is not currently stored or analyzed by PaperMC, though requests pass through CloudFlare.

The update checker can be disabled in the paper-global.yml configuration file. The relevant section is as follows:

update-checker:
  enabled: false

Alternatively you can disable the update checker by adding the following JVM argument when starting your server:

-Dpaper.disableStartupVersionCheck