diff --git a/android/.github/workflows/build-debug.yml b/android/.github/workflows/build-debug.yml
index 2a578b5..5ffd812 100644
--- a/android/.github/workflows/build-debug.yml
+++ b/android/.github/workflows/build-debug.yml
@@ -19,11 +19,11 @@ jobs:
         with:
           node-version: '22'
 
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: '17'
+          java-version: '21'
 
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v3
diff --git a/android/.github/workflows/release.yml b/android/.github/workflows/release.yml
index 4ef323e..f96c284 100644
--- a/android/.github/workflows/release.yml
+++ b/android/.github/workflows/release.yml
@@ -18,11 +18,11 @@ jobs:
         with:
           node-version: '22'
 
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: '17'
+          java-version: '21'
 
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v3
diff --git a/android/README.md b/android/README.md
index ec6371a..be6a35e 100644
--- a/android/README.md
+++ b/android/README.md
@@ -31,7 +31,7 @@ and the `<audio>` element all work offline.
 
 - Capacitor 8 (Android wrapper)
 - Loto upstream: SvelteKit 2 + Vite 7 + `@sveltejs/adapter-static` + `@vite-pwa/sveltekit`
-- minSdk 24 · targetSdk 36 · JDK 17 · Node 22 (Capacitor 8 requires ≥22)
+- minSdk 24 · targetSdk 36 · JDK 21 · Node 22 (Capacitor 8 requires both)
 
 ## Setup