diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b72d055..7a3d9c3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,12 +20,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
       - name: setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.14"
           check-latest: true
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 7f48ffb..52815d0 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -13,12 +13,12 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
       - name: setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.14"
           check-latest: true
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index ce146b2..d31ca34 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -9,12 +9,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
       with:
         fetch-depth: 0
 
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: "3.14"
         check-latest: true
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4e9523d..97ef7f7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,12 +20,12 @@ jobs:
           - "3.14"
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
       with:
         fetch-depth: 0
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
         check-latest: true
diff --git a/src/spectrumkit/dielectricspectrum.py b/src/spectrumkit/dielectricspectrum.py
index efc49ac..9731636 100755
--- a/src/spectrumkit/dielectricspectrum.py
+++ b/src/spectrumkit/dielectricspectrum.py
@@ -121,7 +121,7 @@ def calculate_spectrum_from_dipole(
     dsusc = np.zeros(seglen, dtype=complex)
 
     # Loop over segments
-    for s in range(0, segs):
+    for s in range(segs):
         logging.info(f"\rSegment {s + 1} of {segs}")
         ss = 0 + 0j
 
@@ -198,7 +198,6 @@ def calculate_spectrum_from_dipole(
         logging.info(f"Binned data consists of {len(susc)} datapoints")
     else:
         logging.info(f"Not binning data: there are {len(susc)} datapoints")
-        pass
 
     return results
 
@@ -290,7 +289,7 @@ def calculate_spectrum_from_current(
     dsusc = np.zeros(seglen, dtype=complex)
 
     # Loop over segments
-    for s in range(0, segs):
+    for s in range(segs):
         logging.info(f"\rSegment {s + 1} of {segs}")
         ss = 0 + 0j
 
@@ -777,7 +776,6 @@ def _conclude(self) -> None: ...
     @render_docs
     def save(self) -> None:
         """${SAVE_METHOD_DESCRIPTION}"""  # noqa: D415
-        ...
 
 
 def WienerKhinchin(time, timeseries, volume, temperature, spectrum_type="dipole"):
diff --git a/src/spectrumkit/lib/preprocessing.py b/src/spectrumkit/lib/preprocessing.py
index 0c6ca4f..85da39b 100644
--- a/src/spectrumkit/lib/preprocessing.py
+++ b/src/spectrumkit/lib/preprocessing.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-#
 # Copyright (c) 2026 Authors and contributors
 # (see the AUTHORS.rst file for the full list of names)
 #
diff --git a/src/spectrumkit/lib/util.py b/src/spectrumkit/lib/util.py
index f12d964..46786ba 100644
--- a/src/spectrumkit/lib/util.py
+++ b/src/spectrumkit/lib/util.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-#
 # Copyright (c) 2025 Authors and contributors
 # (see the AUTHORS.rst file for the full list of names)
 #
@@ -38,7 +36,7 @@ def bin(a: np.ndarray, bins: np.ndarray) -> np.ndarray:
     count = np.zeros(len(bins), dtype=int)
     ic = -1
 
-    for i in range(0, len(a)):
+    for i in range(len(a)):
         if i in bins:
             ic += 1  # index for new average
         avg[ic] += a[i]
diff --git a/tests/data/__init__.py b/tests/data/__init__.py
index 3f398a8..111d757 100644
--- a/tests/data/__init__.py
+++ b/tests/data/__init__.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 """init file for datafiles."""
 # -*- Mode: python; tab-width: 4; indent-tabs-mode:nil; coding:utf-8 -*-
 #
diff --git a/tests/lib/test_math.py b/tests/lib/test_math.py
index 3fa00c7..3a79fbb 100644
--- a/tests/lib/test_math.py
+++ b/tests/lib/test_math.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-#
 # Copyright (c) 2025 Authors and contributors
 # (see the AUTHORS.rst file for the full list of names)
 #
diff --git a/tests/tests.py b/tests/tests.py
index bae86a5..acaf8dc 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-#
 # Copyright (c) 2025 Authors and contributors
 # (see the AUTHORS.rst file for the full list of names)
 #
@@ -18,7 +16,7 @@
 from spectrumkit import DielectricSpectrum, calculate_spectrum_from_dipole
 
 sys.path.append(str(Path(__file__).parents[1]))
-from data import WATER_TPR_NPT, WATER_TRR_NPT  # noqa: E402
+from data import WATER_TPR_NPT, WATER_TRR_NPT
 
 
 class TestDielectricSpectrum: