diff --git a/python-package/lightgbm/basic.py b/python-package/lightgbm/basic.py
index 8256dc026973..e17e8513f7ca 100644
--- a/python-package/lightgbm/basic.py
+++ b/python-package/lightgbm/basic.py
@@ -1593,7 +1593,7 @@ def __init__(
         self.used_indices: Optional[List[int]] = None
         self._need_slice = True
         self._predictor: Optional[_InnerPredictor] = None
-        self.pandas_categorical = None
+        self.pandas_categorical: Optional[List[List]] = None
         self._params_back_up = None
         self.version = 0
         self._start_row = 0  # Used when pushing rows one by one.
diff --git a/python-package/lightgbm/callback.py b/python-package/lightgbm/callback.py
index 7db3d400ecd6..2f77ee740c75 100644
--- a/python-package/lightgbm/callback.py
+++ b/python-package/lightgbm/callback.py
@@ -164,7 +164,7 @@ def __call__(self, env: CallbackEnv) -> None:
             else:
                 data_name, eval_name = item[1].split()
                 res_mean = item[2]
-                res_stdv = item[4]
+                res_stdv = item[4]  # type: ignore[misc]
                 self.eval_result[data_name][f'{eval_name}-mean'].append(res_mean)
                 self.eval_result[data_name][f'{eval_name}-stdv'].append(res_stdv)