diff --git a/src/App.php b/src/App.php
index 5224c55..843ac4d 100644
--- a/src/App.php
+++ b/src/App.php
@@ -1957,8 +1957,9 @@ final class App
 
             $event['image_url'] = null;
             $eventImage = trim((string) ($event['image'] ?? ''));
-            if ($eventImage !== '' && is_file($this->dashboardMediaDirectory($username) . '/' . basename($eventImage))) {
-                $event['image_url'] = '/event-image?date=' . rawurlencode($date) . '&id=' . rawurlencode((string) ($event['id'] ?? ''));
+            $eventImagePath = $this->dashboardMediaDirectory($username) . '/' . basename($eventImage);
+            if ($eventImage !== '' && is_file($eventImagePath)) {
+                $event['image_url'] = '/event-image?date=' . rawurlencode($date) . '&id=' . rawurlencode((string) ($event['id'] ?? '')) . '&v=' . rawurlencode((string) filemtime($eventImagePath));
             }
             $events[] = $event;
         }
@@ -1970,7 +1971,7 @@ final class App
 
         $path = $this->dashboardMediaDirectory($username) . '/' . basename($fileName);
         if (is_file($path)) {
-            $entry['background_image_url'] = '/day-image?date=' . rawurlencode($date);
+            $entry['background_image_url'] = '/day-image?date=' . rawurlencode($date) . '&v=' . rawurlencode((string) filemtime($path));
         }
 
         return $entry;