diff --git a/pyproject.toml b/pyproject.toml
index 62c8bb0d7d..f5cac430f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     "scikit-build-core",
-    "pybind11",
+    "pybind11<3",
     "numpy>=2.0.1"
 ]
 build-backend = "scikit_build_core.build"