diff --git a/web/src/components/settings/PolygonCanvas.tsx b/web/src/components/settings/PolygonCanvas.tsx
index 9ac4bad70..63ce9fa15 100644
--- a/web/src/components/settings/PolygonCanvas.tsx
+++ b/web/src/components/settings/PolygonCanvas.tsx
@@ -39,7 +39,7 @@ export function PolygonCanvas({
       const element = new window.Image();
       element.width = width;
       element.height = height;
-      element.src = `${apiHost}api/${camera}/latest.webp`;
+      element.src = `${apiHost}api/${camera}/latest.webp?cache=${Date.now()}`;
       return element;
     }
   }, [camera, width, height, apiHost]);