diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1bef46a..9035f09 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -6,7 +6,7 @@ repos:
     - id: end-of-file-fixer
     - id: trailing-whitespace
 - repo: https://github.com/psf/black
-  rev: 23.12.0
+  rev: 24.1.1
   hooks:
     - id: black
       args: [--line-length=80]
diff --git a/grits/__init__.py b/grits/__init__.py
index 64f1d42..bdcac03 100644
--- a/grits/__init__.py
+++ b/grits/__init__.py
@@ -1,4 +1,5 @@
 """GRiTS: A coarse-grain toolkit using chemical grammars."""
+
 from importlib.metadata import PackageNotFoundError, version
 
 from . import utils
diff --git a/grits/coarsegrain.py b/grits/coarsegrain.py
index 2acc810..28e3d72 100644
--- a/grits/coarsegrain.py
+++ b/grits/coarsegrain.py
@@ -1,4 +1,5 @@
 """GRiTS: Coarse-graining tools."""
+
 import json
 import os
 import tempfile
diff --git a/grits/finegrain.py b/grits/finegrain.py
index 7c4e3ec..62fb57a 100644
--- a/grits/finegrain.py
+++ b/grits/finegrain.py
@@ -1,4 +1,5 @@
 """GRiTS: Fine-graining tools."""
+
 __all__ = ["backmap"]
 
 import itertools as it
diff --git a/grits/utils.py b/grits/utils.py
index 32d823f..ce3487b 100644
--- a/grits/utils.py
+++ b/grits/utils.py
@@ -1,4 +1,5 @@
 """Utility functions for GRiTS."""
+
 import json
 import re
 import warnings