diff --git a/pyproject.toml b/pyproject.toml
index c984562f..673de8e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ requires = [
     "wheel",
     "scikit-build>=0.15",
     "cmake>=3.14",
-    "numpy >= 1.23.1"]
+    "numpy>=1.23.1,<2"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -37,7 +37,7 @@ classifiers = [
 ]
 requires-python = ">=3.10"
 dependencies = [
-    "numpy >= 1.23.1",
+    "numpy>=1.23.1,<2",
 ]
 dynamic = ["version"]