diff --git a/src/quant_platform_kit/common/cn_equity_calendar.py b/src/quant_platform_kit/common/cn_equity_calendar.py
index f4aeefe..7d879f3 100644
--- a/src/quant_platform_kit/common/cn_equity_calendar.py
+++ b/src/quant_platform_kit/common/cn_equity_calendar.py
@@ -5,9 +5,28 @@
 
 CN_EQUITY_TIMEZONE = "Asia/Shanghai"
 
-# Weekday holidays on SSE/SZSE calendars (2024-01-01 .. 2026-12-31), sourced from AkShare trade-date history.
+# Weekday holidays on SSE/SZSE calendars (2023-01-01 .. 2026-12-31), sourced from the official
+# SSE/SZSE holiday notices for 2023 and the existing trade-date history for later years.
 CN_EQUITY_HOLIDAYS: frozenset[str] = frozenset(
     {
+        "2023-01-02",
+        "2023-01-23",
+        "2023-01-24",
+        "2023-01-25",
+        "2023-01-26",
+        "2023-01-27",
+        "2023-04-05",
+        "2023-05-01",
+        "2023-05-02",
+        "2023-05-03",
+        "2023-06-22",
+        "2023-06-23",
+        "2023-09-29",
+        "2023-10-02",
+        "2023-10-03",
+        "2023-10-04",
+        "2023-10-05",
+        "2023-10-06",
         "2024-01-01",
         "2024-02-09",
         "2024-02-12",
diff --git a/tests/test_cn_equity_calendar.py b/tests/test_cn_equity_calendar.py
index 82f29f2..5cefd93 100644
--- a/tests/test_cn_equity_calendar.py
+++ b/tests/test_cn_equity_calendar.py
@@ -25,6 +25,36 @@ def test_new_year_holiday_is_not_trading_day(self) -> None:
     def test_regular_weekday_is_trading_day(self) -> None:
         self.assertTrue(is_cn_equity_trading_day("2024-01-02"))
 
+    def test_2023_weekday_holidays_are_not_trading_days(self) -> None:
+        closed_days = (
+            "2023-01-02",
+            "2023-01-23",
+            "2023-01-24",
+            "2023-01-25",
+            "2023-01-26",
+            "2023-01-27",
+            "2023-04-05",
+            "2023-05-01",
+            "2023-05-02",
+            "2023-05-03",
+            "2023-06-22",
+            "2023-06-23",
+            "2023-09-29",
+            "2023-10-02",
+            "2023-10-03",
+            "2023-10-04",
+            "2023-10-05",
+            "2023-10-06",
+        )
+        for day in closed_days:
+            with self.subTest(day=day):
+                self.assertFalse(is_cn_equity_trading_day(day))
+
+    def test_2023_post_holiday_weekdays_are_trading_days(self) -> None:
+        for day in ("2023-01-03", "2023-01-30", "2023-04-06", "2023-05-04", "2023-06-26", "2023-10-09"):
+            with self.subTest(day=day):
+                self.assertTrue(is_cn_equity_trading_day(day))
+
     def test_next_trading_day_skips_weekend_and_holiday(self) -> None:
         self.assertEqual(next_cn_equity_trading_day("2024-02-08"), date(2024, 2, 19))