diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e93b16a69..61d424105 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,19 +2,19 @@
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
   - repo: https://github.com/PyCQA/isort
-    rev: 5.9.3
+    rev: 5.10.1
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 21.9b0
+    rev: 22.1.0
     hooks:
       - id: black
   - repo: https://github.com/PyCQA/flake8
-    rev: 3.9.2
+    rev: 4.0.1
     hooks:
       - id: flake8
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.1.0
     hooks:
       - id: check-docstring-first
       - id: check-merge-conflict
diff --git a/safe_transaction_service/history/services/balance_service.py b/safe_transaction_service/history/services/balance_service.py
index 473d93372..e2fb092ad 100644
--- a/safe_transaction_service/history/services/balance_service.py
+++ b/safe_transaction_service/history/services/balance_service.py
@@ -269,10 +269,10 @@ def get_usd_balances(
             token_address = balance.token_address
             if not token_address:  # Ether
                 fiat_conversion = eth_price
-                fiat_balance = fiat_conversion * (balance.balance / 10 ** 18)
+                fiat_balance = fiat_conversion * (balance.balance / 10**18)
             else:
                 fiat_conversion = eth_price * token_eth_value
-                balance_with_decimals = balance.balance / 10 ** balance.token.decimals
+                balance_with_decimals = balance.balance / 10**balance.token.decimals
                 fiat_balance = fiat_conversion * balance_with_decimals
 
             balances_with_usd.append(