diff --git a/pyproject.toml b/pyproject.toml
index 84fe22f..6651f00 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,8 @@
 [build-system]
 requires = [
-    "setuptools",
+    # pin setuptools on pypy to workaround this bug: https://github.com/pypa/distutils/issues/283
+    "setuptools<72.2.0; platform_python_implementation == 'PyPy'",
+    "setuptools; platform_python_implementation != 'PyPy'",
     "wheel",
     "setuptools_scm",
     "cython >= 0.28.4",