diff --git a/pyproject.toml b/pyproject.toml
index fe9d222..1701770 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ packages = [
 dependencies = [
     "retrying>=1.3.4",
     "tenacity>=8.1.0",
-    "numpy>=1.24.1",
+    "numpy>=1.24.1,<2.0.0",
     "pandas>=1.5.3",
     "astropy>=5.2.1",
     "astroquery>=0.4.6",