diff --git a/mobile/app.json b/mobile/app.json
index e374ce0..1e84ebf 100644
--- a/mobile/app.json
+++ b/mobile/app.json
@@ -31,7 +31,8 @@
         { "iCloudContainerEnvironment": "Production" }
       ],
       "expo-background-fetch",
-      "expo-task-manager"
+      "expo-task-manager",
+      "@maplibre/maplibre-react-native"
     ]
   }
 }
diff --git a/mobile/app/activity/[id].tsx b/mobile/app/activity/[id].tsx
index 3d73e70..dd22815 100644
--- a/mobile/app/activity/[id].tsx
+++ b/mobile/app/activity/[id].tsx
@@ -34,6 +34,9 @@ export default function ActivityScreen() {
   const [loadingMap, setLoadingMap] = useState(false);
   const [loadingChart, setLoadingChart] = useState(false);
 
+  // instanceUrl and token are in the dep array to avoid a stale-closure bug in
+  // release builds: Hermes executes effects sooner and captures empty strings if
+  // the deps are omitted.  Guards on geojson/timeseries prevent double-fetching.
   useEffect(() => {
     if (!row) return;
 
@@ -62,7 +65,8 @@ export default function ActivityScreen() {
         .catch(() => {})
         .finally(() => setLoadingChart(false));
     }
-  }, [row?.id]);
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [row?.id, instanceUrl, token]);
 
   if (!row) {
     return (