diff --git a/py_gnome/conda_requirements.txt b/py_gnome/conda_requirements.txt
index 246359c56..487f99afd 100644
--- a/py_gnome/conda_requirements.txt
+++ b/py_gnome/conda_requirements.txt
@@ -38,7 +38,7 @@ pyzmq
 # tblib
 
 ## Base numerical libs
-numpy
+numpy <2
 scipy
 
 ## Modeling libs