diff --git a/gokart/parameter.py b/gokart/parameter.py
index c83c4290..7b1d3062 100644
--- a/gokart/parameter.py
+++ b/gokart/parameter.py
@@ -120,7 +120,7 @@ def _warn_on_wrong_param_type(self, param_name, param_value):
 
 class ExplicitBoolParameter(luigi.BoolParameter):
     def __init__(self, *args, **kwargs):
-        luigi.Parameter.__init__(self, *args, **kwargs)
+        super(luigi.BoolParameter, self).__init__(*args, **kwargs)
 
     def _parser_kwargs(self, *args, **kwargs):  # type: ignore
         return luigi.Parameter._parser_kwargs(*args, *kwargs)
diff --git a/gokart/task.py b/gokart/task.py
index c6afc517..0ee838dd 100644
--- a/gokart/task.py
+++ b/gokart/task.py
@@ -402,7 +402,7 @@ def _to_str_params(task):
 
             return task.to_str_params(only_significant=True)
 
-        dependencies = [_to_str_params(task) for task in flatten(self.requires())]
+        dependencies: list[Any] = [_to_str_params(task) for task in flatten(self.requires())]
         dependencies = [d for d in dependencies if d is not None]
         dependencies.append(self.to_str_params(only_significant=True))
         dependencies.append(self.__class__.__name__)
@@ -445,7 +445,7 @@ def get_info(self, only_significant=False):
         for param_name, param_value in self.param_kwargs.items():
             if (not only_significant) or params[param_name].significant:
                 if isinstance(params[param_name], gokart.TaskInstanceParameter):
-                    params_str[param_name] = type(param_value).__name__ + '-' + param_value.make_unique_id()
+                    params_str[param_name] = type(param_value).__name__ + '-' + cast(TaskOnKart[Any], param_value).make_unique_id()
                 else:
                     params_str[param_name] = params[param_name].serialize(param_value)
         return params_str