diff --git a/blockchain/proof_of_stake.py b/blockchain/proof_of_stake.py
index 568824921..b988bfe2f 100644
--- a/blockchain/proof_of_stake.py
+++ b/blockchain/proof_of_stake.py
@@ -1,5 +1,6 @@
 import random
 
+
 class Validator:
     def __init__(self, name: str, stake: int) -> None:
         """
@@ -12,6 +13,7 @@ class Validator:
         self.name = name
         self.stake = stake
 
+
 def choose_validator(validators: list[Validator]) -> Validator:
     """
     Selects a validator to create the next block based on the weight of their stake.
@@ -31,11 +33,8 @@ def choose_validator(validators: list[Validator]) -> Validator:
         True
     """
     total_stake = sum(v.stake for v in validators)
-    weighted_validators = [
-        (v, v.stake / total_stake) for v in validators
-    ]
+    weighted_validators = [(v, v.stake / total_stake) for v in validators]
     selected = random.choices(
-        [v[0] for v in weighted_validators],
-        weights=[v[1] for v in weighted_validators]
+        [v[0] for v in weighted_validators], weights=[v[1] for v in weighted_validators]
     )
     return selected[0]