diff --git a/weldx_widgets/generic.py b/weldx_widgets/generic.py
index a548fe0..bc004a8 100644
--- a/weldx_widgets/generic.py
+++ b/weldx_widgets/generic.py
@@ -1,4 +1,5 @@
 """Generic widgets."""
+
 import base64
 import contextlib
 import hashlib
diff --git a/weldx_widgets/tests/conftest.py b/weldx_widgets/tests/conftest.py
index 0529201..80d31f3 100644
--- a/weldx_widgets/tests/conftest.py
+++ b/weldx_widgets/tests/conftest.py
@@ -1,4 +1,5 @@
 """Pytest configuration."""
+
 import pytest
 
 
diff --git a/weldx_widgets/tests/test_eval.py b/weldx_widgets/tests/test_eval.py
index 86a74c8..f66ec2f 100644
--- a/weldx_widgets/tests/test_eval.py
+++ b/weldx_widgets/tests/test_eval.py
@@ -1,4 +1,5 @@
 """Test for WidgetEvaluateSinglePassWeld."""
+
 from weldx import WeldxFile
 from weldx.asdf.cli.welding_schema import single_pass_weld_example
 from weldx_widgets.widget_evaluate import WidgetEvaluateSinglePassWeld
diff --git a/weldx_widgets/tests/test_gas.py b/weldx_widgets/tests/test_gas.py
index e241a58..c4581b3 100644
--- a/weldx_widgets/tests/test_gas.py
+++ b/weldx_widgets/tests/test_gas.py
@@ -1,4 +1,5 @@
 """Tests for WidgetShieldingGas."""
+
 import pytest
 
 from weldx import WeldxFile
diff --git a/weldx_widgets/tests/test_generic.py b/weldx_widgets/tests/test_generic.py
index 5836a90..b7b6cdf 100644
--- a/weldx_widgets/tests/test_generic.py
+++ b/weldx_widgets/tests/test_generic.py
@@ -1,4 +1,5 @@
 """Tests for generic widgets."""
+
 import pandas as pd
 
 import weldx
diff --git a/weldx_widgets/tests/test_groove_sel.py b/weldx_widgets/tests/test_groove_sel.py
index 60fa7d7..ed99149 100644
--- a/weldx_widgets/tests/test_groove_sel.py
+++ b/weldx_widgets/tests/test_groove_sel.py
@@ -1,4 +1,5 @@
 """Tests for groove selection widget."""
+
 import pytest
 
 import weldx
diff --git a/weldx_widgets/tests/test_process.py b/weldx_widgets/tests/test_process.py
index 6463cf0..ea7371b 100644
--- a/weldx_widgets/tests/test_process.py
+++ b/weldx_widgets/tests/test_process.py
@@ -1,4 +1,5 @@
 """Tests for GMAW widgets."""
+
 import pytest
 
 import weldx
diff --git a/weldx_widgets/tests/util.py b/weldx_widgets/tests/util.py
index 6be1644..878ac1e 100644
--- a/weldx_widgets/tests/util.py
+++ b/weldx_widgets/tests/util.py
@@ -1,4 +1,5 @@
 """Testing utils."""
+
 import contextlib
 import os
 
diff --git a/weldx_widgets/visualization/types.py b/weldx_widgets/visualization/types.py
index da812d6..3e0080b 100644
--- a/weldx_widgets/visualization/types.py
+++ b/weldx_widgets/visualization/types.py
@@ -1,4 +1,5 @@
 """Type aliases shared in visualization package."""
+
 from typing import List, Tuple, Union
 
 import pandas as pd
diff --git a/weldx_widgets/widget_base.py b/weldx_widgets/widget_base.py
index b9f4572..2abe94b 100644
--- a/weldx_widgets/widget_base.py
+++ b/weldx_widgets/widget_base.py
@@ -1,4 +1,5 @@
 """Base classes for widgets."""
+
 import abc
 
 from ipywidgets import HBox, Layout, Output, VBox
diff --git a/weldx_widgets/widget_evaluate.py b/weldx_widgets/widget_evaluate.py
index e04328c..97de893 100644
--- a/weldx_widgets/widget_evaluate.py
+++ b/weldx_widgets/widget_evaluate.py
@@ -9,6 +9,7 @@
 5. Parameters for the power source.
 
 """
+
 from collections import defaultdict
 
 import matplotlib.pyplot as plt
diff --git a/weldx_widgets/widget_factory.py b/weldx_widgets/widget_factory.py
index 8ed3224..3e2e8be 100644
--- a/weldx_widgets/widget_factory.py
+++ b/weldx_widgets/widget_factory.py
@@ -1,4 +1,5 @@
 """Factory for commonly used widget elements."""
+
 import contextlib
 
 from ipywidgets import HTML, BoundedFloatText, Label, Layout, Text
diff --git a/weldx_widgets/widget_gas.py b/weldx_widgets/widget_gas.py
index b6ef176..6bfa93d 100644
--- a/weldx_widgets/widget_gas.py
+++ b/weldx_widgets/widget_gas.py
@@ -1,4 +1,5 @@
 """Widgets to handle shielding gas selection."""
+
 from typing import List
 
 from bidict import bidict
diff --git a/weldx_widgets/widget_gmaw.py b/weldx_widgets/widget_gmaw.py
index 663d694..07e9af1 100644
--- a/weldx_widgets/widget_gmaw.py
+++ b/weldx_widgets/widget_gmaw.py
@@ -1,4 +1,5 @@
 """Widget to edit weldx.GMAW process data."""
+
 from functools import lru_cache
 from typing import Union
 
diff --git a/weldx_widgets/widget_groove_sel.py b/weldx_widgets/widget_groove_sel.py
index 8d91631..03cd3aa 100644
--- a/weldx_widgets/widget_groove_sel.py
+++ b/weldx_widgets/widget_groove_sel.py
@@ -1,4 +1,5 @@
 """Widgets to select groove type and tcp movement."""
+
 from __future__ import annotations
 
 import contextlib
diff --git a/weldx_widgets/widget_measurement.py b/weldx_widgets/widget_measurement.py
index 68cb1ea..d67fca1 100644
--- a/weldx_widgets/widget_measurement.py
+++ b/weldx_widgets/widget_measurement.py
@@ -1,4 +1,5 @@
 """Widget to wrap around a measurement."""
+
 from typing import List
 
 from matplotlib import pylab as plt
diff --git a/weldx_widgets/widget_weldx_file.py b/weldx_widgets/widget_weldx_file.py
index 634b92f..3ee3b8b 100644
--- a/weldx_widgets/widget_weldx_file.py
+++ b/weldx_widgets/widget_weldx_file.py
@@ -1,4 +1,5 @@
 """Widget to handle a WeldxFile."""
+
 from weldx import WeldxFile
 
 __all__ = ["WidgetWeldxFile"]