diff --git a/pyproject.toml b/pyproject.toml
index c6fcc2bfc..924e26737 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
     "mp-api==0.45.0",
     "numpy==1.26.4",
     "pandas==2.2.3",
-    "phonopy==2.26.6",
+    "phonopy==2.33.3",
     "pint==0.24.4",
     "pyiron_base==0.10.10",
     "pyiron_snippets==0.1.4",