diff --git a/setup.cfg b/setup.cfg
index cb21a27d..dc10a76f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,6 +30,7 @@ install_requires =
     optuna>=2.4
     bottle
     typing-extensions;python_version<'3.8'
+    scikit-learn
 
 [options.extras_require]
 lint =