The server runs an older Minecraft version than the latest release
Paper's update check at startup reports that newer Minecraft releases exist than the one the server runs.
StartupPaper[21:47:03 WARN]: *************************************************************************************
[21:47:03 WARN]: You are running the latest build for your Minecraft version (26.1.2)
[21:47:03 WARN]: However, you are 1 release(s) behind the latest stable release (26.2)!
[21:47:03 WARN]: It is recommended that you update as soon as possible
[21:47:03 WARN]: https://papermc.io/downloads/paper
[21:47:03 WARN]: *************************************************************************************Your log will have other names, versions and times. Search a line of it from all failures.
What it means
When it starts, Paper checks for updates and prints a banner when the server’s Minecraft version is not the newest stable release. The banner says how many releases behind the server is and which release is the latest. The server runs normally: this is a notice, not a failure.
The rest of the banner (its frame, the build notice, the advice and the download link) is not shown as an issue of its own.
Why it happens
- A new Minecraft version came out since the server was set up.
- The version is pinned on purpose, to keep plugins or mods that do not support the newer release yet, or to match the clients players use.
How to fix
You do not have to do anything. Staying on an older version is fine while it suits your players and plugins. To update:
- Check that your plugins support the newer version (their pages list the versions they work with).
- Make a backup of the world. Updating converts the world to the new version, and an older version cannot load it afterwards.
- Change the server’s Minecraft version and start it. Players then need a client of the new version.
In Perland
The issue appears in the server’s Diagnosis tab as a warning. The Minecraft version is set in the server’s Settings, and Perland asks you to confirm a version change because of what it does to the world.
References
Details the diagnosis reports
Perland's server diagnosis returns this failure as the code server_version_outdated with these parameters, each present only when the log names it.
| Parameter | Meaning |
|---|---|
latest | The latest stable Minecraft release Paper knows of, such as 26.2. |
releasesBehind | How many releases the server's Minecraft version is behind that one. |
Log lines this page covers
However, you are ... release(s) behind the latest stable release (...)!