diff --git a/conductor/tracks/fix_memory_subprocess_20260203/plan.md b/conductor/tracks/fix_memory_subprocess_20260203/plan.md
index 9218379..b0f6d23 100644
--- a/conductor/tracks/fix_memory_subprocess_20260203/plan.md
+++ b/conductor/tracks/fix_memory_subprocess_20260203/plan.md
@@ -12,6 +12,6 @@
     - [ ] Handle edge cases (partial overlap).
 
 ## Phase 3: Optimize Heightmap Export (Optional)
-- [ ] Task: Use in-memory warp in `geodata_pipeline/heightmaps.py`
+- [x] Task: Use in-memory warp in `geodata_pipeline/heightmaps.py` (c9d7677)
     - [ ] Replace temporary file output in `gdal.Warp` with `MEM` driver.
     - [ ] Pass the in-memory dataset to the next processing step.