diff --git a/CHANGES.rst b/CHANGES.rst
index 686501f..37631c3 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,7 @@
 3.0.2 (unreleased)
 ==================
 
+- Packaging: Add a minimal ``pyproject.toml`` to sdists.
 - Fix a test case on Arm32. Note that this is not a supported platform
   (there is no CI for it) and support is best effort; there may be
   other issues lurking. See `issue 385 <https://github.com/python-greenlet/greenlet/issues/385>`_
diff --git a/MANIFEST.in b/MANIFEST.in
index eaecf3a..f9b94e8 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -34,6 +34,7 @@ include *.rst
 include *.cfg
 include *.py
 include *.ini
+include *.toml
 include .clang-format
 include .pylintrc
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..5281d64
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,5 @@
+[build-system]
+build-backend = "setuptools.build_meta"
+requires = [
+     "setuptools >= 40.8.0"
+]