diff --git a/pyproject.toml b/pyproject.toml
index 7c48b07..efcbce2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 build-backend = 'mesonpy'
-requires = ['meson-python>=0.14.0', 'numpy']
+requires = ['meson-python>=0.14.0', 'numpy<2.0']
 
 [project]
 name = "pycdfpp"
@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
 ]
-dependencies = ['numpy', 'pyyaml']
+dependencies = ['numpy<2.0', 'pyyaml']
 dynamic = [
   'version',
 ]