diff --git a/frontends/PyCDE/pyproject.toml b/frontends/PyCDE/pyproject.toml
index f4847d12b622..72462cda5ab1 100644
--- a/frontends/PyCDE/pyproject.toml
+++ b/frontends/PyCDE/pyproject.toml
@@ -7,7 +7,8 @@ requires = [
 
   # MLIR build depends.
   "numpy",
-  "pybind11>=2.9",
+  "pybind11>=2.11,<=2.12",
+  "nanobind==2.4.0",
   "PyYAML",
 
   # PyCDE depends