diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 0fc1568af..4cfc90526 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -10,7 +10,7 @@ dependencies:
 - nglview =3.1.4
 - notebook
 - numpy =1.26.4
-- phonopy =2.26.6
+- phonopy =2.33.3
 - plotly =5.24.1
 - pymatgen =2024.11.13
 - pyscal3 =3.2.7