diff --git a/package.json b/package.json
index d6d03b1..69443f5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.71.0",
+  "version": "1.71.1",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {
diff --git a/src/lib/apple-calendar.ts b/src/lib/apple-calendar.ts
index 2c28fb4..756f4fa 100644
--- a/src/lib/apple-calendar.ts
+++ b/src/lib/apple-calendar.ts
@@ -818,32 +818,17 @@ export const updateEvent = async (
     const updatedIcalString = comp.toString();
     console.log('[APPLE CALENDAR] Updating event with iCal:', updatedIcalString);
 
-    // tsdav types might be slightly off in the d.ts compared to usage or we need to check the actual signature
-    // In d.ts: updateCalendarObject(params: { calendarObject: DAVCalendarObject ... }) -> Promise<Response>
-    // But it doesn't seem to take 'data' in the d.ts signature shown earlier?
-    // Wait, let's look at d.ts again.
-    // updateCalendarObject: (params: { calendarObject: ..., headers?: ... })
-    // It DOES NOT show `data` or `etag` in the params in the d.ts signature shown earlier?
-    // Let's check line 117 of d.ts:
-    // updateCalendarObject: (params: { calendarObject: ... })
-    // This implies the data must be SET on the calendarObject before calling? 
-    // OR the d.ts is incomplete/wrong.
+    // Use updateCalendarObject with the modified calendar object
+    const updateResult = await client.updateCalendarObject({
+      calendarObject: {
+        ...targetObject,
+        data: updatedIcalString,
+      },
+    });
 
-    // Let's assume we need to update the object locally then call update?
-    // Or maybe we use the `davRequest` or `updateObject` lower level if `updateCalendarObject` limits us.
-    // Actually, `updateObject` takes `url`, `data`, `etag`.
-
-    // Let's try using `client.updateObject` directly which is more raw but allows data.
-    // `targetObject.url` is what we need.
-
-    const updateResult = await client.updateObject({
-      url: targetObject.url,
-      data: updatedIcalString,
-      etag: targetObject.etag
-    } as any); // Cast to any to bypass type definition mismatch
-
-    // Log result for debugging
-    if (updateResult && (updateResult as any).status && (updateResult as any).status >= 400) {
+    // Check for errors in the response
+    const status = (updateResult as any)?.status || (updateResult as any)?.ok;
+    if (updateResult && typeof (updateResult as any).status === 'number' && (updateResult as any).status >= 400) {
       console.error('[APPLE CALENDAR] Update failed with status:', (updateResult as any).status);
       throw new Error(`CalDAV update failed with status ${(updateResult as any).status}`);
     }
@@ -1032,11 +1017,13 @@ export const deleteRecurringInstance = async (
 
     // PUT the modified object back
     const updatedData = comp.toString();
-    await client.updateObject({
-      url: objectUrl,
-      data: updatedData,
-      etag: targetObject.etag,
-    } as any);
+    await client.updateCalendarObject({
+      calendarObject: {
+        ...targetObject,
+        url: objectUrl,
+        data: updatedData,
+      },
+    });
 
     console.log('[APPLE CALENDAR] Recurring instance delete complete (mode:', deleteMode, ')');
 
diff --git a/src/lib/synology-calendar.ts b/src/lib/synology-calendar.ts
index 5aabc72..76a4ff1 100644
--- a/src/lib/synology-calendar.ts
+++ b/src/lib/synology-calendar.ts
@@ -820,11 +820,12 @@ export const updateEvent = async (
     const updatedIcalString = comp.toString();
     console.log('[SYNOLOGY CALENDAR] Updating event with iCal:', updatedIcalString);
 
-    await client.updateObject({
-      url: targetObject.url,
-      data: updatedIcalString,
-      etag: targetObject.etag
-    } as any);
+    await client.updateCalendarObject({
+      calendarObject: {
+        ...targetObject,
+        data: updatedIcalString,
+      },
+    });
 
     return {
       id: eventId,
@@ -994,11 +995,13 @@ export const deleteRecurringInstance = async (
 
     // PUT the modified object back
     const updatedData = comp.toString();
-    await client.updateObject({
-      url: objectUrl,
-      data: updatedData,
-      etag: targetObject.etag,
-    } as any);
+    await client.updateCalendarObject({
+      calendarObject: {
+        ...targetObject,
+        url: objectUrl,
+        data: updatedData,
+      },
+    });
 
     console.log('[SYNOLOGY CALENDAR] Recurring instance delete complete (mode:', deleteMode, ')');