diff --git a/sub_windows/sub_window_4.py b/sub_windows/sub_window_4.py
index efb7965..4b5e80d 100644
--- a/sub_windows/sub_window_4.py
+++ b/sub_windows/sub_window_4.py
@@ -140,7 +140,7 @@ class SubWindow(QMainWindow):
         def _custom_filter(image, custom_kernel=None):
             if custom_kernel is None:
                 kernel = np.array(
-                    [[0, -1.5, 0], [-1.5, 7, -1.5], [0, -1.5, 0]], np.float
+                    [[0, -1.5, 0], [-1.5, 7, -1.5], [0, -1.5, 0]], np.float64
                 )
             else:
                 kernel = np.array(
@@ -149,7 +149,7 @@ class SubWindow(QMainWindow):
                         [custom_kernel[3], custom_kernel[4], custom_kernel[5]],
                         [custom_kernel[6], custom_kernel[7], custom_kernel[8]],
                     ],
-                    np.float,
+                    np.float64,
                 )
             dst = cv2.filter2D(src=image, ddepth=cv2.CV_16S, kernel=kernel)
             dst = cv2.convertScaleAbs(dst)