diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 94a73ba6b..e61f50b72 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -8,7 +8,7 @@ dependencies:
 - codacy-coverage
 - matplotlib-base =3.7.1
 - numpy =1.24.3
-- phonopy =2.19.1
+- phonopy =2.20.0
 - pymatgen =2023.5.31
 - pyscal =2.10.18
 - scikit-learn =1.2.2
diff --git a/setup.py b/setup.py
index 0d034a3d4..f435bdd5c 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@
         "clusters": ['scikit-learn==1.2.2'],
         "symmetry": ['spglib==2.0.2'],
         "surface": ['spglib==2.0.2', 'pymatgen==2023.5.31'],
-        "phonopy": ['phonopy==2.19.1', 'spglib==2.0.2'],
+        "phonopy": ['phonopy==2.20.0', 'spglib==2.0.2'],
     },
     cmdclass=versioneer.get_cmdclass(),
 )