diff --git a/pyproject.toml b/pyproject.toml
index 4a88dd709..93d994ada 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,7 @@ dependencies = [
     "packaging>=21.0",
     "tqdm>=4.29.0",
     "joblib>=1.3.0",
+    "numpy<2.0.0" # some of our dependencies are not yet compatible with numpy 2.0
 ]