diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 0b9f53f..b29ede2 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -75,7 +75,7 @@ jobs:
             export PATH="$PYENV_ROOT/bin:$PATH"
             eval "$(pyenv init --path)"
           fi
-          maturin build --release --strip -i "$(which python)"
+          maturin build --release --sdist --strip -i "$(which python)"
           if [[ "$GITHUB_REF" == refs/tags/v* ]]; then
             # For idempotency, ignore any existing built wheels that have already been successfully uploaded.
             twine upload --skip-existing target/wheels/*
diff --git a/python/main/pyproject.toml b/python/main/pyproject.toml
new file mode 100644
index 0000000..573adf8
--- /dev/null
+++ b/python/main/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["maturin>=0.13"]
+build-backend = "maturin"
diff --git a/python/onepass/pyproject.toml b/python/onepass/pyproject.toml
new file mode 100644
index 0000000..573adf8
--- /dev/null
+++ b/python/onepass/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["maturin>=0.13"]
+build-backend = "maturin"