diff --git a/pyproject.toml b/pyproject.toml
index 3823473..f67608a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,3 @@
 [build-system]
-requires = ["packaging", "setuptools", "wheel"]
+requires = ["ninja", "packaging", "setuptools", "wheel"]
 build-backend = "setuptools.build_meta"