diff --git a/zoedepth/data/transforms.py b/zoedepth/data/transforms.py
index 374416dff..0cced1912 100644
--- a/zoedepth/data/transforms.py
+++ b/zoedepth/data/transforms.py
@@ -372,7 +372,7 @@ def __call__(self, sample):
         if self.__use_mask:
             mask = sample["mask"]
         else:
-            mask = np.ones_like(disp, dtype=np.bool)
+            mask = np.ones_like(disp, dtype=bool)
 
         if np.sum(mask) == 0:
             return sample