diff --git a/pyproject.toml b/pyproject.toml
index 6072a24..8467c9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,7 @@ authors = [
 ]
 readme = "README.md"
 dependencies = [
+    "numpy<2.0.0",
     "httpx",
     "osm2geojson",
     "shapely",