diff --git a/package-lock.json b/package-lock.json
index 9542b6f..d4326c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.15.6",
+  "version": "1.15.7",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "my-weekly-todo-list",
-      "version": "1.15.6",
+      "version": "1.15.7",
       "license": "MIT",
       "dependencies": {
         "@auth/prisma-adapter": "^2.11.1",
diff --git a/package.json b/package.json
index 7480d9b..e068a24 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.15.6",
+  "version": "1.15.7",
   "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/app/api/tasks/route.ts b/src/app/api/tasks/route.ts
index 6f7f6e2..7768e09 100644
--- a/src/app/api/tasks/route.ts
+++ b/src/app/api/tasks/route.ts
@@ -359,7 +359,7 @@ export async function PATCH(request: NextRequest) {
     const body = await request.json();
 
     const { id } = body;
-    const { title, description, completed, dayOfWeek, order, markdownContent, scheduledDate, startTime, somedayListId, somedaySlotIndex, isRecurring, recurrenceInterval, recurrenceUnit, recurrenceTime, recurrenceEndDate, recurrenceDays, restore, parentTaskId, projectId } = body;
+    const { title, description, completed, dayOfWeek, order, markdownContent, scheduledDate, startTime, somedayListId, somedaySlotIndex, isRecurring, recurrenceInterval, recurrenceUnit, recurrenceTime, recurrenceEndDate, recurrenceDays, restore, parentTaskId, projectId, externalProvider } = body;
 
     if (!id) {
       return NextResponse.json(
@@ -448,6 +448,7 @@ export async function PATCH(request: NextRequest) {
         ...(somedaySlotIndex !== undefined && { somedaySlotIndex: somedaySlotIndex !== null ? parseInt(somedaySlotIndex) : null }),
         ...(parentTaskId !== undefined && { parentTaskId: parentTaskId || null }),
         ...(projectId !== undefined && { projectId: projectId || null }),
+        ...(externalProvider !== undefined && { externalProvider: externalProvider || null }),
       },
     });
 
diff --git a/src/components/WeeklyView.tsx b/src/components/WeeklyView.tsx
index a1ea964..660b628 100644
--- a/src/components/WeeklyView.tsx
+++ b/src/components/WeeklyView.tsx
@@ -3448,6 +3448,9 @@ export default function WeeklyView() {
             // If the task was from a someday list, move it to the calendar
             if (draggedTask.somedayListId) {
                 const newScheduledDate = formatDateToISO(targetDateObj);
+                // Inherit provider from someday list if task doesn't have one
+                const sourceList = somedayLists.find(l => l.id === draggedTask.somedayListId);
+                const taskProvider = draggedTask.externalProvider || sourceList?.externalProvider || null;
                 // Remove from someday list UI
                 setSomedayLists((prev) =>
                     prev.map((l) => ({
@@ -3465,6 +3468,7 @@ export default function WeeklyView() {
                         scheduledDate: newScheduledDate,
                         dayOfWeek,
                         startTime: targetSlot || "",
+                        externalProvider: taskProvider,
                     },
                 ]);
                 // Persist
@@ -3479,6 +3483,7 @@ export default function WeeklyView() {
                             scheduledDate: newScheduledDate,
                             dayOfWeek,
                             startTime: targetSlot || "",
+                            ...(taskProvider && !draggedTask.externalProvider && { externalProvider: taskProvider }),
                         }),
                     });