diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000000000000000000000000000000000000..50864b6ad4f3ffea7135e9683a53859147c0c16d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,13 @@
+[build-system]
+
+# For each Python version, build against the oldest numpy C_API_VERSION for
+# which binary numpy wheels exist, and then the newest version of numpy
+# implementing that C_API_VERSION.
+requires = [
+    "setuptools",
+    "wheel",
+    "numpy; python_version >= '3.10'",
+    "numpy==1.19.5; python_version >= '3.8' and python_version < '3.10'",
+    "numpy==1.15.4; python_version >= '3.7' and python_version < '3.8'",
+    "numpy==1.12.1; python_version < '3.7'",
+]