diff --git a/README.rst b/README.rst
index 44062ccda..6d3aa3b44 100644
--- a/README.rst
+++ b/README.rst
@@ -612,7 +612,7 @@ All other default values are highlighted with bold:
      -
    * - Malaysia
      - MY
-     - States and federal territories: 01 (Johor), 02 (Kedah), 03 (Kelantan), 04 (Melaka), 05 (Negeri Sembilan), 06 (Pahang), 07 (Pulau Pinang), 08 (Perak), 09 (Perlis), 10 (Selangor), 11 (Terengganu), 12 (Sabah), 13 (Sarawak), 14 (WP Kuala Lumpur), 15 (WP Labuan), 16 (WP Putrajaya)
+     - States and federal territories: 01 (Johor, JHR), 02 (Kedah, KDH), 03 (Kelantan, KTN), 04 (Melaka, MLK), 05 (Negeri Sembilan, NSN), 06 (Pahang, PHG), 07 (Pulau Pinang, PNG), 08 (Perak, PRK), 09 (Perlis, PLS), 10 (Selangor, SGR), 11 (Terengganu, TRG), 12 (Sabah, SBH), 13 (Sarawak, SWK), 14 (WP Kuala Lumpur, KUL), 15 (WP Labuan, LBN), 16 (WP Putrajaya, PJY)
      - en_US, **ms_MY**
      -
    * - Maldives
diff --git a/holidays/countries/malaysia.py b/holidays/countries/malaysia.py
index 74e8f3aa0..9816fb7b2 100644
--- a/holidays/countries/malaysia.py
+++ b/holidays/countries/malaysia.py
@@ -87,41 +87,39 @@ class Malaysia(
         "15",
         "16",
     )
-    _deprecated_subdivisions = (
-        "JHR",
-        "KDH",
-        "KTN",
-        "KUL",
-        "LBN",
-        "MLK",
-        "NSN",
-        "PHG",
-        "PJY",
-        "PLS",
-        "PNG",
-        "PRK",
-        "SBH",
-        "SGR",
-        "SWK",
-        "TRG",
-    )
     subdivisions_aliases = {
         "Johor": "01",
+        "JHR": "01",
         "Kedah": "02",
+        "KDH": "02",
         "Kelantan": "03",
+        "KTN": "03",
         "Melaka": "04",
+        "MLK": "04",
         "Negeri Sembilan": "05",
+        "NSN": "05",
         "Pahang": "06",
+        "PHG": "06",
         "Pulau Pinang": "07",
+        "PNG": "07",
         "Perak": "08",
+        "PRK": "08",
         "Perlis": "09",
+        "PLS": "09",
         "Selangor": "10",
+        "SGR": "10",
         "Terengganu": "11",
+        "TRG": "11",
         "Sabah": "12",
+        "SBH": "12",
         "Sarawak": "13",
+        "SWK": "13",
         "WP Kuala Lumpur": "14",
+        "KUL": "14",
         "WP Labuan": "15",
+        "LBN": "15",
         "WP Putrajaya": "16",
+        "PJY": "16",
     }
     supported_languages = ("en_US", "ms_MY")
 
@@ -216,26 +214,6 @@ def _populate_subdiv_holidays(self):
         if self._year <= 1951:
             return None
 
-        deprecated_mapping = {
-            "JHR": "01",
-            "KDH": "02",
-            "KTN": "03",
-            "KUL": "14",
-            "LBN": "15",
-            "MLK": "04",
-            "NSN": "05",
-            "PHG": "06",
-            "PJY": "16",
-            "PLS": "09",
-            "PNG": "07",
-            "PRK": "08",
-            "SBH": "12",
-            "SGR": "10",
-            "SWK": "13",
-            "TRG": "11",
-        }
-        self.subdiv = deprecated_mapping.get(self.subdiv, self.subdiv)
-
         if self.subdiv and self.subdiv not in {"13", "15"}:
             # Deepavali.
             self.dts_observed.add(self._add_diwali(tr("Hari Deepavali")))
diff --git a/tests/countries/test_malaysia.py b/tests/countries/test_malaysia.py
index 956842f1f..bddd8b71e 100644
--- a/tests/countries/test_malaysia.py
+++ b/tests/countries/test_malaysia.py
@@ -10,7 +10,6 @@
 #  Website: https://github.com/vacanza/python-holidays
 #  License: MIT (see LICENSE file)
 
-import warnings
 from unittest import TestCase
 
 from holidays.countries.malaysia import Malaysia, MY, MYS
@@ -26,40 +25,9 @@ def setUpClass(cls):
             for subdiv in Malaysia.subdivisions
         }
 
-    def setUp(self):
-        super().setUp()
-        warnings.simplefilter("ignore", category=DeprecationWarning)
-
     def test_country_aliases(self):
         self.assertAliases(Malaysia, MY, MYS)
 
-    def test_subdiv_deprecation(self):
-        self.assertDeprecatedSubdivisions("This subdivision is deprecated and will be removed")
-
-    def test_deprecated(self):
-        for subdiv1, subdiv2 in (
-            ("JHR", "01"),
-            ("KDH", "02"),
-            ("KTN", "03"),
-            ("KUL", "14"),
-            ("LBN", "15"),
-            ("MLK", "04"),
-            ("NSN", "05"),
-            ("PHG", "06"),
-            ("PJY", "16"),
-            ("PLS", "09"),
-            ("PNG", "07"),
-            ("PRK", "08"),
-            ("SBH", "12"),
-            ("SGR", "10"),
-            ("SWK", "13"),
-            ("TRG", "11"),
-        ):
-            self.assertEqual(
-                sorted(Malaysia(subdiv=subdiv1, years=2023).keys()),
-                sorted(Malaysia(subdiv=subdiv2, years=2023).keys()),
-            )
-
     def test_no_holidays(self):
         self.assertNoHolidays(Malaysia(years=1951))