diff --git a/home-modules/bar/caldav-event.nix b/home-modules/bar/caldav-event.nix
index aea4782..097fc05 100644
--- a/home-modules/bar/caldav-event.nix
+++ b/home-modules/bar/caldav-event.nix
@@ -7,10 +7,9 @@
       libraries = with pkgs.python3Packages; [ caldav ics pytz ];
       flakeIgnore = [ "E302" "E305" "E501" "E261" ];
     } /* python */ ''
-import os
 import json
 from caldav import DAVClient
-from datetime import datetime, timezone
+from datetime import datetime, timezone, timedelta
 from ics import Calendar
 from pytz import UTC
 
@@ -33,13 +32,15 @@ def datetime_parser(dct):
     return dct
 
 def load_cache(cache_file):
-    if os.path.exists(cache_file):
+    try:
         with open(cache_file, "r") as file:
             return json.load(file, object_hook=datetime_parser)
-    return None
+    except (json.JSONDecodeError, FileNotFoundError):
+        return None
 
 def save_cache(cache_file, data):
     with open(cache_file, "w") as file:
+        data['last_checked'] = datetime.now(timezone.utc)
         json.dump(data, file, default=datetime_converter, indent=4)
 
 
@@ -83,6 +84,11 @@ def is_expired(event_dict: dict):
     event_end = event_dict['event_end'].timestamp()
     return not (now <= event_end)
 
+def is_too_old(event_dict: dict) -> bool:
+    last_checked = event_dict['last_checked']
+    now = datetime.now(timezone.utc)
+    return now - last_checked >= timedelta(minutes=10)
+
 if __name__ == "__main__":
     password_file = "${config.sops.secrets."nx2site/radicale/password".path}"  # Path to password file
     cache_file = "/tmp/caldav_event_cache.json"  # Path to cache file
@@ -93,7 +99,7 @@ if __name__ == "__main__":
 
     event_dict = load_cache(cache_file)
 
-    if (event_dict is None) or (is_expired(event_dict)):
+    if (event_dict is None) or is_expired(event_dict) or is_too_old(event_dict):
         event_dict = get_ongoing_or_next_event(url, username, password)
         save_cache(cache_file, event_dict)