diff --git a/package/samplers/auto_sampler/_sampler.py b/package/samplers/auto_sampler/_sampler.py
index 55669274..8815ee8f 100644
--- a/package/samplers/auto_sampler/_sampler.py
+++ b/package/samplers/auto_sampler/_sampler.py
@@ -6,6 +6,7 @@
 from typing import Any
 from typing import TYPE_CHECKING
 
+import cmaes as _  # NOQA
 from optuna.distributions import CategoricalDistribution
 from optuna.logging import get_logger
 from optuna.samplers import BaseSampler
@@ -18,6 +19,8 @@
 from optuna.samplers._lazy_random_state import LazyRandomState
 from optuna.search_space import IntersectionSearchSpace
 from optuna.trial import TrialState
+import scipy as _  # NOQA
+import torch as _  # NOQA
 
 
 if TYPE_CHECKING: