diff --git a/pyproject.toml b/pyproject.toml
index cc3b000..482cc8d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,6 +3,7 @@ requires = [
     "wheel",
     "setuptools<60.0.0",
     "numpy>=1.12",
-    "Cython>=0.21.1"
+    "Cython>=0.21.1",
+    "scipy",
 ]
-build-backend = "setuptools.build_meta"
\ No newline at end of file
+build-backend = "setuptools.build_meta"