diff --git a/setup.cfg b/setup.cfg
index cda371c0..849be138 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,6 +35,7 @@ install_requires =
     spglib>=1.14,<3
     vapory~=0.1.2
     pandas~=2.1
+    ipython>=7.33
 python_requires = >=3.9
 include_package_data = True
 zip_safe = False