diff --git a/stock-lab/app/db.py b/stock-lab/app/db.py
index e9588fa..78701e2 100644
--- a/stock-lab/app/db.py
+++ b/stock-lab/app/db.py
@@ -242,6 +242,19 @@ def get_sell_history(broker: str = None, days: int = None) -> List[Dict[str, Any
         return [dict(r) for r in rows]
 
 
+def update_sell_history(record_id: int, data: Dict[str, Any]) -> Dict[str, Any] | None:
+    fields = ["broker", "ticker", "name", "quantity", "avg_price", "sell_price",
+              "buy_amount", "sell_amount", "realized_profit", "realized_rate", "sold_at"]
+    set_clause = ", ".join(f"{f} = ?" for f in fields)
+    values = [data[f] for f in fields] + [record_id]
+    with _conn() as conn:
+        cur = conn.execute(f"UPDATE sell_history SET {set_clause} WHERE id = ?", values)
+        if cur.rowcount == 0:
+            return None
+        row = conn.execute("SELECT * FROM sell_history WHERE id = ?", (record_id,)).fetchone()
+        return dict(row)
+
+
 def delete_sell_history(record_id: int) -> bool:
     with _conn() as conn:
         cur = conn.execute("DELETE FROM sell_history WHERE id = ?", (record_id,))
diff --git a/stock-lab/app/main.py b/stock-lab/app/main.py
index 485c1a0..5bd3653 100644
--- a/stock-lab/app/main.py
+++ b/stock-lab/app/main.py
@@ -15,7 +15,7 @@ from .db import (
     update_portfolio_item, delete_portfolio_item,
     upsert_broker_cash, get_all_broker_cash, get_broker_cash, delete_broker_cash,
     upsert_asset_snapshot, get_asset_snapshots,
-    add_sell_history, get_sell_history, delete_sell_history,
+    add_sell_history, get_sell_history, update_sell_history, delete_sell_history,
 )
 from .scraper import fetch_market_news, fetch_major_indices, fetch_overseas_news
 from .price_fetcher import get_current_prices
@@ -392,6 +392,15 @@ def create_sell_history(req: SellHistoryRequest):
     return record
 
 
+@app.put("/api/portfolio/sell-history/{record_id}")
+def modify_sell_history(record_id: int, req: SellHistoryRequest):
+    """매도 기록 수정"""
+    record = update_sell_history(record_id, req.model_dump())
+    if record is None:
+        return JSONResponse(status_code=404, content={"error": "not found"})
+    return record
+
+
 @app.delete("/api/portfolio/sell-history/{record_id}")
 def remove_sell_history(record_id: int):
     """매도 기록 삭제"""