diff --git a/pyproject.toml b/pyproject.toml
index 397dcaf..b33bd55 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "mplib"
 dynamic = ["version"]
-dependencies = ["numpy", "toppra >= 0.4.0", "transforms3d >= 0.3.1"]
+dependencies = ["numpy<2.0", "toppra >= 0.4.0", "transforms3d >= 0.3.1"]
 requires-python = ">=3.8"
 authors = [
   {name="Minghua Liu", email = "minghua@ucsd.edu"},