diff --git a/codemagic.yaml b/codemagic.yaml
index fb75c03..18f226e 100644
--- a/codemagic.yaml
+++ b/codemagic.yaml
@@ -193,7 +193,7 @@ workflows:
       vars:
         PACKAGE_NAME: "com.bizgaze.connect"
       node: 22
-      java: 17
+      java: 21   # Capacitor 8's Android build (AGP 8.7 / Gradle 8.11) requires JDK 21 — JDK 17 fails the build.
     scripts:
       - name: Install JS dependencies
         script: |