diff --git a/config/config.json b/config/config.json
index ec5bf740..e100938f 100644
--- a/config/config.json
+++ b/config/config.json
@@ -72,7 +72,7 @@
         "enabled": true,
         "credentials_file": "credentials.json",
         "token_file": "token.pickle",
-        "update_interval": 300,
+        "update_interval": 3600,
         "max_events": 3,
         "calendars": ["birthdays"]
     },
diff --git a/src/calendar_manager.py b/src/calendar_manager.py
index 1d884acb..9479a27f 100644
--- a/src/calendar_manager.py
+++ b/src/calendar_manager.py
@@ -22,7 +22,7 @@ class CalendarManager:
         self.enabled = self.calendar_config.get('enabled', False)
         self.update_interval = self.calendar_config.get('update_interval', 300)
         self.max_events = self.calendar_config.get('max_events', 3)
-        self.calendars = self.calendar_config.get('calendars', ['primary'])
+        self.calendars = self.calendar_config.get('calendars', ['birthdays'])
         self.last_update = 0
         self.events = []
         self.service = None