diff --git a/pyproject.toml b/pyproject.toml
index 0402e67..dd23208 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ classifiers = [
     "Programming Language :: Python :: 3",
 ]
 dependencies = [
-    "numpy",
+    "numpy<2",
     "numba",
 ]
 dynamic = ["version"]