diff --git a/pyproject.toml b/pyproject.toml
index 6ab44b9d..3112a481 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,10 +44,10 @@ dev-flake8 = [
   "pydoclint == 0.7.6",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.9.0", "isort == 8.0.1"]
+dev-formatting = ["black == 26.3.1", "isort == 8.0.1"]
 dev-mkdocs = [
   "Markdown == 3.10.2",
-  "black == 25.9.0",
+  "black == 26.3.1",
   "frequenz-repo-config[lib] == 0.17.0",
   "markdown-callouts == 0.4.0",
   "markdown-svgbob == 202406.1023",
diff --git a/src/frequenz/channels/experimental/_grouping_latest_value_cache.py b/src/frequenz/channels/experimental/_grouping_latest_value_cache.py
index 2c22093b..0606c520 100644
--- a/src/frequenz/channels/experimental/_grouping_latest_value_cache.py
+++ b/src/frequenz/channels/experimental/_grouping_latest_value_cache.py
@@ -3,7 +3,6 @@
 
 """The GroupingLatestValueCache caches the latest values in a receiver grouped by key."""
 
-
 import asyncio
 from collections.abc import (
     Callable,
diff --git a/src/frequenz/channels/experimental/_with_previous.py b/src/frequenz/channels/experimental/_with_previous.py
index 5df2b124..75d418ad 100644
--- a/src/frequenz/channels/experimental/_with_previous.py
+++ b/src/frequenz/channels/experimental/_with_previous.py
@@ -3,7 +3,6 @@
 
 """Composable predicate to cache and compare with the previous message."""
 
-
 from collections.abc import Callable
 from typing import Final, Generic, TypeGuard
 
diff --git a/tests/experimental/test_pipe.py b/tests/experimental/test_pipe.py
index 6775a4d8..f0158e14 100644
--- a/tests/experimental/test_pipe.py
+++ b/tests/experimental/test_pipe.py
@@ -3,7 +3,6 @@
 
 """Tests for the Pipe class."""
 
-
 import asyncio
 import typing
 from contextlib import AsyncExitStack, aclosing, closing
diff --git a/tests/test_anycast.py b/tests/test_anycast.py
index 140a122f..38da03d6 100644
--- a/tests/test_anycast.py
+++ b/tests/test_anycast.py
@@ -3,7 +3,6 @@
 
 """Tests for the Channel implementation."""
 
-
 import asyncio
 
 import pytest
diff --git a/tests/test_broadcast.py b/tests/test_broadcast.py
index 457e0659..7035250b 100644
--- a/tests/test_broadcast.py
+++ b/tests/test_broadcast.py
@@ -3,7 +3,6 @@
 
 """Tests for the Broadcast implementation."""
 
-
 import asyncio
 from dataclasses import dataclass
 from typing import TypeGuard, assert_never
diff --git a/tests/test_file_watcher.py b/tests/test_file_watcher.py
index 720de807..b7cf1ef5 100644
--- a/tests/test_file_watcher.py
+++ b/tests/test_file_watcher.py
@@ -3,7 +3,6 @@
 
 """Tests for `channel.FileWatcher`."""
 
-
 import pathlib
 from collections.abc import AsyncGenerator, Iterator, Sequence
 from typing import Any
diff --git a/tests/test_timer.py b/tests/test_timer.py
index f0909db0..3b052aa1 100644
--- a/tests/test_timer.py
+++ b/tests/test_timer.py
@@ -3,7 +3,6 @@
 
 """Tests for the timer."""
 
-
 import asyncio
 import enum
 import re
diff --git a/tests/test_timer_integration.py b/tests/test_timer_integration.py
index 92f248f4..6f99e252 100644
--- a/tests/test_timer_integration.py
+++ b/tests/test_timer_integration.py
@@ -3,7 +3,6 @@
 
 """Integration tests for the timer."""
 
-
 import asyncio
 from datetime import timedelta