diff --git a/conductor/tracks/fix_rrule_type_error_20260219/plan.md b/conductor/tracks/fix_rrule_type_error_20260219/plan.md
index e3c2fb1..ceeaf12 100644
--- a/conductor/tracks/fix_rrule_type_error_20260219/plan.md
+++ b/conductor/tracks/fix_rrule_type_error_20260219/plan.md
@@ -7,10 +7,10 @@
 - [x] Task: Conductor - User Manual Verification 'Reproduction & Test Setup' (Protocol in workflow.md)
 
 ## Phase 2: Implementation
-- [ ] Task: Implement defensive check in `icalendar.ts`
-    - [ ] Modify `expandRecurrences` function to check if `rruleStr` is a string before calling `.replace()`.
-    - [ ] If `rruleStr` is not a string, log a warning and return the original event (non-recurring fallback).
-    - [ ] Run the reproduction test again to confirm it passes.
+- [x] Task: Implement defensive check in `icalendar.ts` d7401dd
+    - [x] Modify `expandRecurrences` function to check if `rruleStr` is a string before calling `.replace()`.
+    - [x] If `rruleStr` is not a string, log a warning and return the original event (non-recurring fallback).
+    - [x] Run the reproduction test again to confirm it passes.
 - [ ] Task: Conductor - User Manual Verification 'Implementation' (Protocol in workflow.md)
 
 ## Phase 3: Verification & Cleanup