diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e5b975d..b54b486 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,15 +11,15 @@ repos:
     -   id: check-case-conflict
     -   id: check-merge-conflict
 -   repo: https://github.com/psf/black
-    rev: 23.11.0
+    rev: 24.2.0
     hooks:
     -   id: black
 -   repo: https://github.com/pycqa/isort
-    rev: 5.13.0
+    rev: 5.13.2
     hooks:
     -   id: isort
 -   repo: https://github.com/pycqa/flake8
-    rev: 6.1.0
+    rev: 7.0.0
     hooks:
     -   id: flake8
 -   repo: https://github.com/pycqa/pydocstyle
diff --git a/nigsp/operations/__init__.py b/nigsp/operations/__init__.py
index f8a9516..ccc38fa 100644
--- a/nigsp/operations/__init__.py
+++ b/nigsp/operations/__init__.py
@@ -11,7 +11,6 @@
 `nigsp.operations.sdi` or `nigsp.metrisc.sdi`.
 """
 
-
 # Import all operations.
 from .graph import nodestrength, zerocross
 from .laplacian import (
diff --git a/nigsp/references.py b/nigsp/references.py
index 305e06e..be7a297 100644
--- a/nigsp/references.py
+++ b/nigsp/references.py
@@ -1,4 +1,5 @@
 """References to be imported and injected throughout the package."""
+
 from nigsp.due import Doi
 
 PRETI_2019 = Doi("10.1038/s41467-019-12765-7")