diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6ded469..4827e9f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,5 +6,5 @@ pydocstyle==6.1.1
 flake8==7.3.0
 pylint==3.3.8
 black==25.1.0
-pydantic==2.11.7
+pydantic==2.11.9
 pydantic-settings==2.10.1
diff --git a/requirements.txt b/requirements.txt
index 9065e24..9e78f8c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 pymatgen==2025.4.17
-pydantic==2.11.7
+pydantic==2.11.9
 pydantic-settings==2.10.1
 typing-extensions==4.15.0
 monty==2025.3.3