diff --git a/pyproject.toml b/pyproject.toml
index c87d5a5..037571a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ dependencies = [
     "pipython",
     "pyserial",
     "libximc",
+    "scipy",
     "pyyaml",
     "libby@git+https://github.com/CaltechOpticalObservatories/libby.git",
     "hardware_device_base@git+https://github.com/COO-Utilities/hardware_device_base"