diff --git a/metadata/org.grakovne.lissen.yml b/metadata/org.grakovne.lissen.yml
index 08d3d6d5b4..db892fa71e 100644
--- a/metadata/org.grakovne.lissen.yml
+++ b/metadata/org.grakovne.lissen.yml
@@ -457,7 +457,19 @@ Builds:
     gradle:
       - yes
 
+  - versionName: 1.3.21
+    versionCode: 99
+    commit: a95acb5b793f455b33cb48f99926779c4ecbc2de
+    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: 1.3.19
-CurrentVersionCode: 97
+CurrentVersion: 1.3.21
+CurrentVersionCode: 99