diff --git a/catalog_tools/analysis/estimate_beta.py b/catalog_tools/analysis/estimate_beta.py
index 318fe96..998881b 100644
--- a/catalog_tools/analysis/estimate_beta.py
+++ b/catalog_tools/analysis/estimate_beta.py
@@ -1,7 +1,7 @@
 """This module contains functions for the estimation of beta and the b-value.
 """
+from typing import Optional, Tuple, Union
 import numpy as np
-from typing import Optional, Union, Tuple
 
 
 def estimate_b_tinti(magnitudes: np.ndarray,