diff --git a/ci/minecraft-server/test-values.yaml b/ci/minecraft-server/test-values.yaml
index 7e9da95..533e560 100644
--- a/ci/minecraft-server/test-values.yaml
+++ b/ci/minecraft-server/test-values.yaml
@@ -3,13 +3,13 @@
 #
 # 1. minecraft.version: the image tag comes from .Chart.AppVersion, so the JVM
 #    in the image is fixed per published chart version and the Minecraft
-#    version has to match that Java line - Java 8 runs Minecraft up to 1.16.5,
-#    modern versions need Java 17/21 and refuse to start otherwise. This chart
-#    version publishes appVersion "java8", hence 1.12.2 (a classic Java 8 era
-#    release). This value is bumped together with appVersion in the java17 and
-#    java21 follow-up PRs.
+#    version has to match that Java line - Java 8 runs Minecraft only up to
+#    1.16.5, 1.18-1.20.4 need Java 17, and 1.20.5+ need Java 21. No single
+#    Minecraft version boots on all three lines, so this value is bumped
+#    together with appVersion in every Java-line PR.
+#    This chart version publishes appVersion "java17", hence 1.20.1.
 #    The production default is "LATEST", which would pull a 1.21.x server that
-#    a Java 8 JVM cannot load at all.
+#    needs Java 21 and would not start on this line.
 # 2. minecraft.resources.storage: the production 32Gi world volume is backed by
 #    a static hostPath PV in CI (see fixtures.yaml); 2Gi is plenty for a server
 #    that only has to boot.
@@ -25,7 +25,7 @@ secrets:
   minecraftServerRef: vaults/CI/items/minecraft-server
 
 minecraft:
-  version: "1.12.2"
+  version: "1.20.1"
   management:
     # opPlayers deliberately stays at the default (null): the image resolves
     # every name in OPS against the external Playerdb API and aborts the whole
diff --git a/minecraft-server/Chart.yaml b/minecraft-server/Chart.yaml
index 51e8a53..49a513c 100644
--- a/minecraft-server/Chart.yaml
+++ b/minecraft-server/Chart.yaml
@@ -15,10 +15,10 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.4.0+upjava8
+version: 0.4.0+upjava17
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
 # It is recommended to use it with quotes.
-appVersion: "java8"
+appVersion: "java17"