diff -up zstandard-0.23.0/pyproject.toml.orig zstandard-0.23.0/pyproject.toml
--- zstandard-0.23.0/pyproject.toml.orig	2024-07-14 23:58:50.000000000 +0200
+++ zstandard-0.23.0/pyproject.toml	2024-10-03 16:27:20.742934487 +0200
@@ -1,12 +1,12 @@
 [build-system]
 requires = [
     "cffi>=1.16.0; python_version <= '3.12'",
-    "cffi==1.17.0rc1; python_version >= '3.13'",
+    "cffi>=1.17.0; python_version >= '3.13'",
     # 69.0.0 breaks handling of --config-settings=--build-option, which our CI
     # relies on. So constrained to an older version until we figure out a
     # workaround. See comment at
     # https://github.com/pypa/pip/issues/11859#issuecomment-2132287974.
-    "setuptools<69.0.0",
+    "setuptools",
 ]
 # Need to use legacy backend because setup_zstd.py breaks build isolation.
 build-backend = "setuptools.build_meta:__legacy__"