diff --git a/pyproject.toml b/pyproject.toml
index 53cf889..d99e7a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dynamic = ["version"]
 dependencies = [
     "deprecated",
     "pyyaml",
-    "numpy",
+    "numpy<2.0.0",
     "click",
     "ceci>=2.0.1",
     "qp-prob>=0.8.3",