diff --git a/pyproject.toml b/pyproject.toml
index eb9c466c72..071454941c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -104,7 +104,7 @@ strict = [
     "numpy",
     "phonopy==2.27.0",
     "pydantic-settings==2.3.4",
-    "pydantic==2.8.2",
+    "pydantic==2.9.0",
     "pymatgen-analysis-defects==2024.7.19",
     "pymatgen==2024.6.10",
     "python-ulid==2.7.0",