diff --git a/ui/android/build.gradle b/ui/android/build.gradle
index f8f0e43..471660d 100644
--- a/ui/android/build.gradle
+++ b/ui/android/build.gradle
@@ -24,6 +24,17 @@ allprojects {
     }
 }
 
+// Pin build-tools to the compileSdk-matching version for every Android module (the app + the
+// Capacitor modules regenerated by `cap sync`), so AGP does not fall back to its default (35.0.0),
+// which the provisioned / read-only CI SDK does not have installed.
+subprojects {
+    afterEvaluate {
+        if (project.hasProperty('android')) {
+            android.buildToolsVersion = "36.0.0"
+        }
+    }
+}
+
 task clean(type: Delete) {
     delete rootProject.buildDir
 }