Require cffi 2.0.0b1 as minimum version

Author: clin1234

pyproject.toml

@@ -25,7 +25,7 @@ dependencies = []
 
 [project.optional-dependencies]
 cffi = [
-    'cffi>=1.17 ; python_version >= "3.13" and platform_python_implementation != "PyPy"',
+    'cffi>=2.0.0b1 ; python_version >= "3.13" and platform_python_implementation != "PyPy"',
 ]
 
 [project.urls]
@@ -34,7 +34,7 @@ Documentation = "https://python-zstandard.readthedocs.io/en/latest/"
 
 [build-system]
 requires = [
-    "cffi>=1.17.0 ; platform_python_implementation != 'PyPy'",
+    "cffi>=2.0.0b1 ; platform_python_implementation != 'PyPy'",
     "packaging",
     "setuptools",
 ]

setup.py

@@ -30,7 +30,8 @@
 # garbage collection pitfalls.
 # Require 1.17 everywhere so we don't have to think about supporting older
 # versions.
-MINIMUM_CFFI_VERSION = "1.17"
+# Require 2.0 for improved free-threading support
+MINIMUM_CFFI_VERSION = "2.0"
 
 ext_suffix = os.environ.get("SETUPTOOLS_EXT_SUFFIX")
 if ext_suffix: