diff --git a/pyproject.toml b/pyproject.toml
index eb027504b21865e0d98b025f96814b4dc997a2c1..36af2d731edb08aa9f4735d31a914fcb2d32bd29 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ packages = ["GeoSpatialTools"]
 name = "GeoSpatialTools"
 version = "0.1.1"
 dependencies = [
+    "numpy",
 ]
 requires-python = ">=3.11"
 authors = [