Download Paper 1.21.9-rc1 Server
The Paper server JAR for Minecraft 1.21.9-rc1, direct from the official source. Build details, release date and Java requirements below.
Java required
Java 21
Released
Sep 30, 2025
Build
36
File size
50 MB
Channel
Experimental
SHA-1 checksum
f737c4ce0afd8ca897c5330188634859148419c6c2d2e172c65f581c47430ab1
Setup
Start script (Linux/macOS)
java -Xms4G -Xmx4G --add-modules=jdk.incubator.vector -XX:+UseG1GC -jar paper.jar noguiStart script (Windows)
java -Xms4G -Xmx4G --add-modules=jdk.incubator.vector -XX:+UseG1GC -jar paper.jar --nogui
pauseOther Minecraft 1.21 builds of Paper
Other builds in the 1.21.x line. The newest stable is selected by default above.