numpy 2 is out!

pyproject.toml

@@ -6,21 +6,13 @@ requires = [
     "Cython>=3.0.8",
     # Below copied from scipy https://github.com/scipy/scipy/blob/main/pyproject.toml
 
-    # default numpy requirements
-    "numpy==1.22.4; python_version<='3.10' and platform_python_implementation != 'PyPy'",
-    "numpy==1.23.2; python_version=='3.11' and platform_python_implementation != 'PyPy'",
-    "numpy>=1.26.0,<1.27; python_version=='3.12'",
-
-    # PyPy requirements; 1.25.0 was the first version to have pypy-3.9 wheels,
-    # and 1.25.0 also changed the C API target to 1.19.x, so no longer a need
-    # for an exact pin.
-    "numpy>=1.25.0; python_version>='3.9' and platform_python_implementation=='PyPy'",
-
-    # For Python versions which aren't yet officially supported, we specify an
-    # unpinned NumPy which allows source distributions to be used and allows
-    # wheels to be used as soon as they become available.
-    # Python 3.13 has known issues that are only fixed in numpy 2.0.0.dev0
-    "numpy>=2.0.0.dev0; python_version>='3.13'",
+    # numpy requirement for wheel builds for distribution on PyPI - building
+    # against 2.x yields wheels that are also compatible with numpy 1.x at
+    # runtime.
+    # Note that building against numpy 1.x works fine too - users and
+    # redistributors can do this by installing the numpy version they like and
+    # disabling build isolation.
+    "numpy>=2.0.0rc1",
 ]
 build-backend = "setuptools.build_meta"