diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e7601e9..ca4a131 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,13 +10,13 @@ repos:
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: 'v0.9.3'
+    rev: 'v0.9.4'
     hooks:
       - id: ruff
         args: ["--fix"]
 
   - repo: https://github.com/psf/black
-    rev: 24.10.0
+    rev: 25.1.0
     hooks:
     - id: black
 
diff --git a/pyremo/cal.py b/pyremo/cal.py
index fae0a90..04bee4f 100644
--- a/pyremo/cal.py
+++ b/pyremo/cal.py
@@ -1,5 +1,4 @@
-"""this module handles absolute calendars that occur in REMO datasets.
-"""
+"""this module handles absolute calendars that occur in REMO datasets."""
 
 import datetime as dt
 import math
diff --git a/pyremo/core/exp.py b/pyremo/core/exp.py
index 87f63b0..93690c7 100644
--- a/pyremo/core/exp.py
+++ b/pyremo/core/exp.py
@@ -1,5 +1,4 @@
-"""Module for working and parsing Remo output files.
-"""
+"""Module for working and parsing Remo output files."""
 
 import os
 from pathlib import Path
diff --git a/pyremo/physics/constants.py b/pyremo/physics/constants.py
index f146b6e..81cb836 100644
--- a/pyremo/physics/constants.py
+++ b/pyremo/physics/constants.py
@@ -1,6 +1,5 @@
 # flake8: noqa
-"""collection of common Remo physics constants.
-"""
+"""collection of common Remo physics constants."""
 
 # descritions from REMO
 #!C**
diff --git a/pyremo/physics/core.py b/pyremo/physics/core.py
index ceb1c2c..e2e9e5e 100644
--- a/pyremo/physics/core.py
+++ b/pyremo/physics/core.py
@@ -1,6 +1,5 @@
 # flake8: noqa
-"""physics module that contains some common Remo physics functions.
-"""
+"""physics module that contains some common Remo physics functions."""
 
 import numpy as np
 import xarray as xr
diff --git a/pyremo/prsint/_defaults.py b/pyremo/prsint/_defaults.py
index 119aa8a..ecc3c2b 100644
--- a/pyremo/prsint/_defaults.py
+++ b/pyremo/prsint/_defaults.py
@@ -1,5 +1,4 @@
-"""default values for the command line interface
-"""
+"""default values for the command line interface"""
 
 # RELHUM not yet available
 variables = ["T", "FI", "U", "V", "QD", "QW"]
diff --git a/tests/test_tutorial.py b/tests/test_tutorial.py
index 9e1ccb8..c9fff2d 100644
--- a/tests/test_tutorial.py
+++ b/tests/test_tutorial.py
@@ -1,5 +1,4 @@
-"""Test loading of tutorial data
-"""
+"""Test loading of tutorial data"""
 
 import pyremo as pr