diff --git a/pyproject.toml b/pyproject.toml
index fa3da28a..9b475fc1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ classifiers = [
     "Intended Audience :: Science/Research",
 ]
 dependencies = [
-    "bottle",
+    "bottle>=0.13.0",
     "optuna>=3.1.0",
     "packaging",
     "scikit-learn",