diff --git a/python/setup.py b/python/setup.py
index bfe63589f..4bbc82283 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -36,7 +36,7 @@ def get_long_description():
     packages = ['dlisio', 'dlisio.dlis', 'dlisio.lis', 'dlisio.common', 'dlisio.dlis.utils'],
     license = 'LGPL-3.0',
     platforms = 'any',
-    install_requires = ['numpy'],
+    install_requires = ['numpy < 2.0'],
     setup_requires = ['setuptools >= 28',
                       'pybind11 >= 2.3',
                       'setuptools_scm',