diff --git a/requirements.txt b/requirements.txt
index 11e922e..439c065 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,6 @@ pymatgen==2024.2.20
 ase==3.23.0
 joblib==1.3.1
 phonopy==2.20.0
-phono3py==3.3.4
 scikit-learn>=1.3.0
 seekpath==2.1.0
 numpy==1.26.4