diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 3b1b5a136..696bd21cd 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -9,7 +9,7 @@ dependencies:
 - nglview =3.1.1
 - notebook
 - numpy =1.26.4
-- phonopy =2.21.0
+- phonopy =2.21.1
 - plotly =5.18.0
 - pymatgen =2024.2.8
 - pyscal =2.10.18
diff --git a/pyproject.toml b/pyproject.toml
index e2236d253..839580c0e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ surface = [
     "pymatgen==2024.2.8",
 ]
 phonopy = [
-    "phonopy==2.21.0",
+    "phonopy==2.21.1",
     "spglib==2.3.1",
 ]
 pyxtal = ["pyxtal==0.6.2"]