diff --git a/metadata/org.grakovne.lissen.yml b/metadata/org.grakovne.lissen.yml
index f8130d4eaf..779e3d32c4 100644
--- a/metadata/org.grakovne.lissen.yml
+++ b/metadata/org.grakovne.lissen.yml
@@ -769,7 +769,19 @@ Builds:
     gradle:
       - yes
 
+  - versionName: 1.6.21
+    versionCode: 10621
+    commit: d94d36006cfea95338b108facdbe5c9a10a2444a
+    subdir: app
+    sudo:
+      - echo "deb https://deb.debian.org/debian trixie main" > /etc/apt/sources.list.d/trixie.list
+      - apt-get update
+      - apt-get install -y -t trixie openjdk-21-jdk-headless
+      - update-alternatives --auto java
+    gradle:
+      - yes
+
 AutoUpdateMode: Version
 UpdateCheckMode: Tags
-CurrentVersion: 1.6.20
-CurrentVersionCode: 10620
+CurrentVersion: 1.6.21
+CurrentVersionCode: 10621