diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5bae7da..667d84b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 24.8.0
+    rev: 25.1.0
     hooks:
     -   id: black
 
diff --git a/clusterking_physics/models/bdlnu/inputs.py b/clusterking_physics/models/bdlnu/inputs.py
index 10d347c..a8e9276 100644
--- a/clusterking_physics/models/bdlnu/inputs.py
+++ b/clusterking_physics/models/bdlnu/inputs.py
@@ -1,4 +1,4 @@
-""" Input parameters/physical constants. """
+"""Input parameters/physical constants."""
 
 import flavio
 from flavio.parameters import default_parameters as par