diff --git a/setup.py b/setup.py
index 7e0559a..9e7e8c8 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
         "pyupgrade",
         "pydocstyle",
         "nbqa",
-        "phonopy==2.22.1",
+        "phonopy==2.23.1",
         # Jupyter notebook
         "notebook",
         "matplotlib",