diff --git a/setup.py b/setup.py
index cc5a5b535b..bf1676ecd3 100644
--- a/setup.py
+++ b/setup.py
@@ -135,10 +135,10 @@ def __getitem__(self, key):
         "pyomo >= 6.7.1",
         "pint",  # required to use Pyomo units
         "networkx",  # required to use Pyomo network
-        "numpy",
+        "numpy<2",
         # pandas constraint added on 2023-08-30 b/c bug in v2.1
         # see IDAES/idaes-pse#1253
-        "pandas!=2.1.0",
+        "pandas!=2.1.0,<3",
         "scipy",
         "sympy",  # idaes.core.util.expr_doc
         "matplotlib",