diff --git a/src/tomli/_parser.py b/src/tomli/_parser.py
index 1151c8e..2e4644f 100644
--- a/src/tomli/_parser.py
+++ b/src/tomli/_parser.py
@@ -9,7 +9,6 @@
 __lazy_modules__ = ["tomli._re"]
 
 import sys
-from types import MappingProxyType
 
 from ._re import (
     RE_DATETIME,
@@ -20,6 +19,9 @@
     match_to_number,
 )
 
+if sys.version_info < (3, 15):  # pragma: no cover
+    from types import MappingProxyType as frozendict
+
 TYPE_CHECKING = False
 if TYPE_CHECKING:
     from collections.abc import Iterable
@@ -65,7 +67,7 @@
 KEY_INITIAL_CHARS: Final = BARE_KEY_CHARS | frozenset("\"'")
 HEXDIGIT_CHARS: Final = frozenset("abcdef" "ABCDEF" "0123456789")
 
-BASIC_STR_ESCAPE_REPLACEMENTS: Final = MappingProxyType(
+BASIC_STR_ESCAPE_REPLACEMENTS: Final = frozendict(
     {
         "\\b": "\u0008",  # backspace
         "\\t": "\u0009",  # tab