diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 88d864aec..e9f0c9f0f 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -10,7 +10,7 @@ dependencies:
 - nglview =3.1.4
 - notebook
 - numpy =2.3.4
-- phonopy =2.43.2
+- phonopy =2.43.5
 - plotly =6.3.1
 - pymatgen =2025.6.14
 - pyscal3 =3.3.0
diff --git a/pyproject.toml b/pyproject.toml
index a6afe0551..ed9646ba9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ surface = [
     "pymatgen==2025.6.14",
 ]
 phonopy = [
-    "phonopy==2.43.2",
+    "phonopy==2.43.5",
     "spglib==2.6.0",
 ]