diff --git a/pyproject.toml b/pyproject.toml
index 2f593c3..488ce19 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ docs = [
     "docutils==0.20.1",
 ]
 dev = ["pre-commit>=2.12.1"]
-tests = ["pytest==9.0.3"]
+tests = ["pytest==9.1.1"]
 strict = [
     "matplotlib==3.10.9",
     "pymatgen==2025.10.7",