diff --git a/requirements.txt b/requirements.txt
index bd7f011..0124463 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ myst-parser>=5.1.0
 nbsphinx>=0.9.8
 numba>=0.67.0
 numpy>=2.5.2,<2.6
-optuna>=4.9.0,<5
+optuna>=5.0.0,<6
 pandas>=3.0.5
 progressbar2>=4.6.0
 pytest>=9.1.1
diff --git a/setup.cfg b/setup.cfg
index 362d107..f6ed6fc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,7 +18,7 @@ packages = find:
 include_package_data = True
 python_requires = >=3.11
 install_requires =
-    optuna>=3.4,<5
+    optuna>=3.4,<6
     alpaca-py>=0.10.0,<1
     diskcache>=5.4.0,<6
     joblib>=1.2.0,<2