diff --git a/pyproject.toml b/pyproject.toml
index 4f8b0f72ce..793053ed13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -106,7 +106,7 @@ strict = [
     "numpy",
     "openmm-mdanalysis-reporter==0.1.0",
     "openmm==8.1.1",
-    "phonopy==2.27.0",
+    "phonopy==2.28.0",
     "pydantic-settings==2.5.2",
     "pydantic==2.9.2",
     "pymatgen-analysis-defects==2024.7.19",