diff --git a/pyproject.toml b/pyproject.toml
index 7482ed1..7874b80 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ dependencies = [
     "sbpy",
     "matplotlib", # for plotting
     "pandas",
+    "scipy",
 ]
 
 [project.urls]