diff --git a/steamwarci.yml b/steamwarci.yml
index ee2ff3dcd8..f9d3571568 100644
--- a/steamwarci.yml
+++ b/steamwarci.yml
@@ -1,7 +1,7 @@
 build:
-  - "JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 ./gradlew applyPatches"
-  - "JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 ./gradlew createReobfBundlerJar"
-  - "JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 ./gradlew --stop"
+  - "JAVA_HOME=/usr/lib/jvm/java-21-openj9-amd64 ./gradlew applyPatches"
+  - "JAVA_HOME=/usr/lib/jvm/java-21-openj9-amd64 ./gradlew createReobfBundlerJar"
+  - "JAVA_HOME=/usr/lib/jvm/java-21-openj9-amd64 ./gradlew --stop"
 
 artifacts:
   "/binarys/paper-1.20.1.jar": "build/libs/paper-bundler-1.20.1-R0.1-SNAPSHOT-reobf.jar"