diff --git a/tests/resources/xkrx.csv b/tests/resources/xkrx.csv
index ef000446..3a2e7942 100644
--- a/tests/resources/xkrx.csv
+++ b/tests/resources/xkrx.csv
@@ -8628,3 +8628,254 @@
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+2021-12-20,2021-12-20 00:01:00,2021-12-20 06:30:00
+2021-12-21,2021-12-21 00:01:00,2021-12-21 06:30:00
+2021-12-22,2021-12-22 00:01:00,2021-12-22 06:30:00
+2021-12-23,2021-12-23 00:01:00,2021-12-23 06:30:00
+2021-12-24,2021-12-24 00:01:00,2021-12-24 06:30:00
+2021-12-27,2021-12-27 00:01:00,2021-12-27 06:30:00
+2021-12-28,2021-12-28 00:01:00,2021-12-28 06:30:00
+2021-12-29,2021-12-29 00:01:00,2021-12-29 06:30:00
+2021-12-30,2021-12-30 00:01:00,2021-12-30 06:30:00
\ No newline at end of file
diff --git a/tests/test_xkrx_calendar.py b/tests/test_xkrx_calendar.py
index 14e3d883..4eee382f 100644
--- a/tests/test_xkrx_calendar.py
+++ b/tests/test_xkrx_calendar.py
@@ -40,7 +40,7 @@ def test_normal_year(self):
             self.assertNotIn(session_label, self.calendar.all_sessions)
 
     def test_constrain_construction_dates(self):
-        # the XKRX calendar currently goes from 1986 to 2020, inclusive.
+        # the XKRX calendar currently goes from 1986 to 2021, inclusive.
         with self.assertRaises(ValueError) as e:
             self.calendar_class(T('1985-12-31'), T('2005-01-01'))
 
@@ -53,13 +53,13 @@ def test_constrain_construction_dates(self):
         )
 
         with self.assertRaises(ValueError) as e:
-            self.calendar_class(T('2005-01-01'), T('2021-01-01'))
+            self.calendar_class(T('2005-01-01'), T('2022-01-03'))
 
         self.assertEqual(
             str(e.exception),
             (
-                'The XKRX holidays are only recorded to 2020,'
-                ' cannot instantiate the XKRX calendar for 2021.'
+                'The XKRX holidays are only recorded to 2021,'
+                ' cannot instantiate the XKRX calendar for 2022.'
             )
         )
 
diff --git a/trading_calendars/exchange_calendar_xkrx.py b/trading_calendars/exchange_calendar_xkrx.py
index 9979fa6f..2c7005c8 100644
--- a/trading_calendars/exchange_calendar_xkrx.py
+++ b/trading_calendars/exchange_calendar_xkrx.py
@@ -523,7 +523,17 @@
     "2020-10-02",
     "2020-10-09",
     "2020-12-25",
-    "2020-12-31"
+    "2020-12-31",
+    "2021-01-01",
+    "2021-02-11",
+    "2021-02-12",
+    "2021-03-01",
+    "2021-05-05",
+    "2021-05-19",
+    "2021-09-20",
+    "2021-09-21",
+    "2021-09-22",
+    "2021-12-31",
 ])
 
 
diff --git a/trading_calendars/precomputed_trading_calendar.py b/trading_calendars/precomputed_trading_calendar.py
index dfb95a2a..321a0e6e 100644
--- a/trading_calendars/precomputed_trading_calendar.py
+++ b/trading_calendars/precomputed_trading_calendar.py
@@ -23,7 +23,6 @@ def __init__(self, start=None, end=None):
             end = pd.Timestamp(
                 '{}-12-31'.format(latest_precomputed_year), tz=UTC
             )
-
         super(PrecomputedTradingCalendar, self).__init__(start=start, end=end)
 
         if earliest_precomputed_year > self.first_trading_session.year: