diff --git a/pymatgen/core/periodic_table.py b/pymatgen/core/periodic_table.py
index 0dc1cf08641..a70aa046fe5 100644
--- a/pymatgen/core/periodic_table.py
+++ b/pymatgen/core/periodic_table.py
@@ -14,6 +14,7 @@
 from typing import TYPE_CHECKING
 
 import numpy as np
+from monty.dev import deprecated
 from monty.json import MSONable
 
 from pymatgen.core.units import SUPPORTED_UNIT_NAMES, FloatWithUnit, Ha_to_eV, Length, Mass, Unit
@@ -696,10 +697,23 @@ def is_post_transition_metal(self) -> bool:
         return self.symbol in ("Al", "Ga", "In", "Tl", "Sn", "Pb", "Bi")
 
     @property
+    @deprecated(
+        message="Please use is_rare_earth instead, which is corrected to include Y and Sc.", deadline=(2025, 1, 1)
+    )
     def is_rare_earth_metal(self) -> bool:
-        """True if element is a rare earth metal."""
+        """True if element is a rare earth metal, Lanthanides (La) series and Actinides (Ac) series.
+
+        This property is Deprecated, and scheduled for removal after 2025-01-01.
+        """
         return self.is_lanthanoid or self.is_actinoid
 
+    @property
+    def is_rare_earth(self) -> bool:
+        """True if element is a rare earth element, including Lanthanides (La)
+        series, Actinides (Ac) series, Scandium (Sc) and Yttrium (Y).
+        """
+        return self.is_lanthanoid or self.is_actinoid or self.symbol in {"Sc", "Y"}
+
     @property
     def is_metal(self) -> bool:
         """True if is a metal."""
diff --git a/requirements.txt b/requirements.txt
index 89b7dd125d7..787b6b1c803 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 numpy==1.26.0
 sympy==1.12
 requests==2.32.0
-monty==2024.2.26
+monty==2024.5.24
 ruamel.yaml==0.18.6
 scipy==1.11.3
 tabulate==0.9.0