1.21.11
The 1.21.11 Update
We would like to thank everyone that worked on this update:
If you’d like to support PaperMC as a whole, you can find more information at https://papermc.io/sponsors.
For server owners and admins
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For developers
Minecraft versioning changes
Starting in 2026, Mojang is changing their versioning scheme. In short, it will start with the current year, then the drop number within that year, possibly followed by patch and hotfix numbers. I.e. the first drop in 2026 will be 26.1 and its first hotfix would be 26.1.1. If you do any sort of Minecraft version parsing that expects a version to start with 1., make sure to prepare for this change.
Unobfuscated server jars
Starting with 26.1, Mojang will no longer provide obfuscated server jars and instead have them contain all class, method, field names etc.
Now is a good time to make sure your plugins are able to run on server jars that are not obfuscated.
You can do this by starting a 1.21.11 Paper server using the -Dpaper.disablePluginRemapping=true startup flag and removing the reobfJar step from your paperweight-userdev config.
As spigot is moving to unobfuscated server jars for 26.1 as well, we are dropping the spigot internal remapper in 26.1.
If your plugin is still using spigot mappings, migrate immediately as your plugin will not be working on either spigot or paper 26.1.
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