diff --git a/setup.py b/setup.py
index 1c2ffe2..3b3b319 100644
--- a/setup.py
+++ b/setup.py
@@ -6,13 +6,14 @@ from setuptools.command.develop import develop as _develop
 from setuptools.command.bdist_wheel import bdist_wheel as _bdist_wheel
 from packaging.specifiers import SpecifierSet
 from packaging.version import Version
-from pyproject_parser import PyProject
 from setuptools import Distribution
 from setuptools import setup, Command
 
 import os
 import sys
 
+import tomllib
+
 # Disable SourceLink during the build until it can read repo-format v1, #1613
 os.environ["EnableSourceControlManagerQueries"] = "false"
 
@@ -127,8 +128,9 @@ class bdist_wheel(_bdist_wheel):
         return python_tag, abi_tag, platform_tag
 
     def _get_python_tag(self) -> str:
-        pyproject = PyProject.load("pyproject.toml")
-        project = pyproject.project or {}
+        with open("pyproject.toml", "rb") as f:
+            pyproject = tomllib.load(f)
+        project = pyproject.get("project") or {}
 
         requires_python = project.get("requires-python")
         if not requires_python: