diff --git a/pyproject.toml b/pyproject.toml
index 9060385232..b184257ea0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -98,7 +98,7 @@ strict = [
     "monty==2024.5.24",
     "mp-api==0.41.2",
     "numpy",
-    "phonopy==2.26.5",
+    "phonopy==2.26.6",
     "pydantic-settings==2.3.4",
     "pydantic==2.8.2",
     "pymatgen-analysis-defects==2024.5.11",