diff --git a/ceilopyter/noise.py b/ceilopyter/noise.py
index cba329c..a7a26a7 100644
--- a/ceilopyter/noise.py
+++ b/ceilopyter/noise.py
@@ -5,7 +5,7 @@
 
 def remove_noise(
     beta_uncorr: npt.NDArray[np.floating], noise_floor: float, snr_limit: float = 5
-) -> npt.NDArray[np.bool]:
+) -> npt.NDArray[np.bool_]:
     zero_ranges = np.all(beta_uncorr == 0, axis=0)
     n_zeros = np.argmax(~zero_ranges[::-1])