diff --git a/requirements.txt b/requirements.txt
index 461cebf0..6cf2915d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 mpi4py
 h5py
-numpy>=2
+numpy>=2,<2.4
 unyt>=3
 astropy>=6
 scipy