diff --git a/minecraft-server/Chart.yaml b/minecraft-server/Chart.yaml
index 354f794..0e544c5 100644
--- a/minecraft-server/Chart.yaml
+++ b/minecraft-server/Chart.yaml
@@ -13,8 +13,8 @@ type: application
 # continuously, so a pod restart could pull a different image than the last one
 # without anything being recorded anywhere. The dated tags are immutable, so the
 # image is now pinned by the chart version like every other chart in this repo.
-version: 4.0.0+up2026.8.2.java17
-appVersion: "2026.8.2-java17"
+version: 4.0.1+up2026.8.2.java21
+appVersion: "2026.8.2-java21"
 
 maintainers:
   - name: jklein
diff --git a/minecraft-server/values.yaml b/minecraft-server/values.yaml
index 5bb8982..73d014c 100644
--- a/minecraft-server/values.yaml
+++ b/minecraft-server/values.yaml
@@ -226,8 +226,8 @@ minecraft:
   # This value must match the Java line of the chart version: the image tag
   # comes from .Chart.AppVersion, so the JVM is fixed per published chart
   # version. Java 8 runs Minecraft up to 1.16.5, 1.18-1.20.4 need Java 17 and
-  # 1.20.5+ need Java 21. This chart publishes appVersion "2026.8.2-java17".
-  version: "1.20.1"
+  # 1.20.5+ need Java 21. This chart publishes appVersion "2026.8.2-java21".
+  version: "1.21.1"
 
 # curseforge, ftb and curseforgeServerpack are mutually exclusive - enabling
 # more than one is rejected by the chart (before 1.0.0 it silently rendered a