diff --git a/requirements.txt b/requirements.txt
index b7fdc84d..146789f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ numpy >= 1.17.0
 PyYAML >= 5.3
 matplotlib >= 2.2.2
 h5py >= 3.0
-phonopy >=2.24,<2.25
+phonopy >=2.25,<2.26
diff --git a/setup.py b/setup.py
index d08cc8b5..1784f761 100644
--- a/setup.py
+++ b/setup.py
@@ -326,7 +326,7 @@ def main(build_dir):
             "matplotlib>=2.2.2",
             "h5py>=3.0",
             "spglib>=2.0",
-            "phonopy>=2.24,<2.25",
+            "phonopy>=2.25,<2.26",
         ],
         provides=["phono3py"],
         scripts=scripts_phono3py,