diff --git a/ci.sh b/ci.sh
index aae8b3c..1d13161 100755
--- a/ci.sh
+++ b/ci.sh
@@ -23,11 +23,11 @@ function curl-harder() {
 }
 
 
-python -m pip install -U pip setuptools wheel
+python -m pip install -U pip setuptools wheel pep517
 python -m pip --version
 
-python setup.py sdist --formats=zip
-python -m pip install dist/*.zip
+python -m pep517.build --source --out-dir dist/ .
+python -m pip install dist/*.tar.gz
 
 if [ "$CHECK_FORMATTING" = "1" ]; then
     pip install black
diff --git a/pyproject.toml b/pyproject.toml
index 407fb8b..86cce2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,3 +5,10 @@ directory = "newsfragments"
 title_format = "pytest-trio {version} ({project_date})"
 underlines = ["-", "~", "^"]
 issue_format = "`#{issue} <https://github.com/python-trio/pytest-trio/issues/{issue}>`__"
+
+[build-system]
+requires = [
+    "setuptools >= 50.0.3",
+    "wheel >= 0.35.1",
+]
+build-backend = "setuptools.build_meta"