diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 41eb920..b3eb11e 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: 'v0.1.11'
+    rev: 'v0.1.14'
     hooks:
       - id: ruff
         args: ["--fix"]
 
   - repo: https://github.com/psf/black
-    rev: 23.12.1
+    rev: 24.1.1
     hooks:
     - id: black
 
diff --git a/notebooks/remo-cmor-dev-json.ipynb b/notebooks/remo-cmor-dev-json.ipynb
index 386631c..a5be9f4 100644
--- a/notebooks/remo-cmor-dev-json.ipynb
+++ b/notebooks/remo-cmor-dev-json.ipynb
@@ -103,7 +103,7 @@
     "    CORDEX_domain=\"EUR-11\",\n",
     "    time_units=None,\n",
     "    allow_units_convert=True,\n",
-    "    allow_derive=True\n",
+    "    allow_derive=True,\n",
     "    # inpath = cx.tables.cmor_tables_inpath,\n",
     "    # inpath=\"/Users/lars/.cordex-cmor-tables\",\n",
     "    # inpath=\"/Users/lars/python/euro-cordex/tables/cordex-cmor-tables/CORDEX-CMIP5\"\n",
diff --git a/pyremo/cli.py b/pyremo/cli.py
index f39b608..e57a2b1 100644
--- a/pyremo/cli.py
+++ b/pyremo/cli.py
@@ -1,4 +1,5 @@
 """Console script for pyremo."""
+
 import argparse
 import os
 from os import path as op
diff --git a/pyremo/cmor/derived.py b/pyremo/cmor/derived.py
index abd3162..80d3040 100644
--- a/pyremo/cmor/derived.py
+++ b/pyremo/cmor/derived.py
@@ -1,7 +1,6 @@
 """Compute derived variables for cmorization.
 """
 
-
 import inspect
 from warnings import warn
 
diff --git a/pyremo/core/exp.py b/pyremo/core/exp.py
index f741793..87f63b0 100644
--- a/pyremo/core/exp.py
+++ b/pyremo/core/exp.py
@@ -1,5 +1,6 @@
 """Module for working and parsing Remo output files.
 """
+
 import os
 from pathlib import Path
 
diff --git a/pyremo/tutorial.py b/pyremo/tutorial.py
index b12adc4..cb199ab 100644
--- a/pyremo/tutorial.py
+++ b/pyremo/tutorial.py
@@ -4,6 +4,7 @@
 * building tutorials in the documentation.
 * stolen from xarray!
 """
+
 # code stolen from xarray, I am sorry!
 import os
 import pathlib