diff --git a/.github/workflows/test_runner.yml b/.github/workflows/test_runner.yml
index 906624c..0eefb23 100644
--- a/.github/workflows/test_runner.yml
+++ b/.github/workflows/test_runner.yml
@@ -25,7 +25,7 @@ jobs:
       - name: install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest coveralls black===24.1.1
+          pip install pytest coveralls black===24.3.0
           pip install .
 
 #      - name: ensure black format
diff --git a/pandas_market_calendars/calendar_utils.py b/pandas_market_calendars/calendar_utils.py
index 574b1e6..42a77e8 100644
--- a/pandas_market_calendars/calendar_utils.py
+++ b/pandas_market_calendars/calendar_utils.py
@@ -1,6 +1,7 @@
 """
 Utilities to use with market_calendars
 """
+
 import itertools
 import warnings
 
diff --git a/pandas_market_calendars/holidays/jpx_equinox.py b/pandas_market_calendars/holidays/jpx_equinox.py
index e36b4dc..785a22c 100644
--- a/pandas_market_calendars/holidays/jpx_equinox.py
+++ b/pandas_market_calendars/holidays/jpx_equinox.py
@@ -11,6 +11,7 @@
 using pyephem (http://rhodesmill.org/pyephem/quick.html#equinoxes-solstices).
 For a double check, see:  https://aa.usno.navy.mil/data/docs/EarthSeasons.php
 """
+
 import pandas as pd
 from pandas.tseries.holiday import sunday_to_monday