diff --git a/src/app/alerts/[id]/AlertDetail.tsx b/src/app/alerts/[id]/AlertDetail.tsx
index 4476ab1..ef9dbe5 100644
--- a/src/app/alerts/[id]/AlertDetail.tsx
+++ b/src/app/alerts/[id]/AlertDetail.tsx
@@ -127,7 +127,20 @@ export default function AlertDetail({ initialAlert }: { initialAlert: Alert }) {
         body: JSON.stringify({ status: newStatus }),
       });
       if (!res.ok) throw new Error(`HTTP ${res.status}`);
-      setAlert(await res.json());
+      const updated: Alert = await res.json();
+      setAlert(updated);
+
+      // Keep the cached dashboard count in sync so the badge and summary
+      // card reflect the change immediately when navigating back.
+      try {
+        const raw = localStorage.getItem("oversnitch_stats");
+        if (raw) {
+          const stats = JSON.parse(raw);
+          const delta = updated.status === "open" ? 1 : -1;
+          stats.summary.openAlertCount = Math.max(0, (stats.summary.openAlertCount ?? 0) + delta);
+          localStorage.setItem("oversnitch_stats", JSON.stringify(stats));
+        }
+      } catch {}
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
     } finally {