diff --git a/pyproject.toml b/pyproject.toml
index 1da4339..177c7a1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,7 @@ authors = [
 requires-python = ">=3.8"
 dependencies = [
     "cadquery == 2.3.1",
+    "numpy < 2",  # Dependency of cadquery, but not working with v2.x
 ]
 version = "0.1.0"