diff --git a/pyproject.toml b/pyproject.toml
index 8cb347206..5a2a7b22d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ dynamic = ["version", "readme"]
 [build-system]
 requires = [
     "scikit-build-core[pyproject]",
-    "pybind11<3.0.0",
+    "pybind11<4.0.0",
     "numpy>=2.0.0",
     #    "mkl-devel; platform_machine in 'x86_64 x86 AMD64'",
     #    "mkl-static; platform_machine in 'x86_64 x86 AMD64'",