diff --git a/contexthub/aidl/Android.bp b/contexthub/aidl/Android.bp
index 674f8af..d49607d 100644
--- a/contexthub/aidl/Android.bp
+++ b/contexthub/aidl/Android.bp
@@ -57,6 +57,11 @@
             version: "3",
             imports: [],
         },
+        {
+            version: "4",
+            imports: [],
+        },
+
     ],
-    frozen: false,
+    frozen: true,
 }