diff --git a/pyproject.toml b/pyproject.toml
index 6e69ef93..b9057541 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
     "its_preselector @ git+https://github.com/NTIA/Preselector@3.1.0",
     "msgspec>=0.16.0,<1.0.0",
     "numexpr>=2.8.3",
-    "numpy>=1.25.0",
+    "numpy>=1.25.0,<2",
     "psutil>=5.9.4",
     "python-dateutil>=2.0",
     "ray>=2.10.0",