diff --git a/pyssp/modeling.py b/pyssp/modeling.py
index 9324ddd..7f4eda8 100644
--- a/pyssp/modeling.py
+++ b/pyssp/modeling.py
@@ -4,13 +4,11 @@
 from typing import NoReturn
 
 import numpy as np
-import scipy as sp
-import scipy.signal as signal
 from numpy.typing import ArrayLike
+from scipy import signal
 
 from .state import convm
 
-
 logger = logging.getLogger(__name__)