diff --git a/pyproject.toml b/pyproject.toml
index 93357367..7c513c6e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,10 +45,10 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "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",
   "mike == 2.1.3",
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.2",
diff --git a/src/frequenz/client/common/metrics/_metric.py b/src/frequenz/client/common/metrics/_metric.py
index e1802963..19739fcd 100644
--- a/src/frequenz/client/common/metrics/_metric.py
+++ b/src/frequenz/client/common/metrics/_metric.py
@@ -3,7 +3,6 @@
 
 """Supported metrics for microgrid components."""
 
-
 import enum
 
 from frequenz.api.common.v1alpha8.metrics import metrics_pb2
diff --git a/src/frequenz/client/common/metrics/proto/_bounds.py b/src/frequenz/client/common/metrics/proto/_bounds.py
index 835aaedb..0a738f3e 100644
--- a/src/frequenz/client/common/metrics/proto/_bounds.py
+++ b/src/frequenz/client/common/metrics/proto/_bounds.py
@@ -3,7 +3,6 @@
 
 """Loading of Bounds objects from protobuf messages."""
 
-
 from frequenz.api.common.v1alpha8.metrics import bounds_pb2
 
 from .._bounds import Bounds
diff --git a/src/frequenz/client/common/microgrid/electrical_components/__init__.py b/src/frequenz/client/common/microgrid/electrical_components/__init__.py
index d0091cf2..daed78ca 100644
--- a/src/frequenz/client/common/microgrid/electrical_components/__init__.py
+++ b/src/frequenz/client/common/microgrid/electrical_components/__init__.py
@@ -2,6 +2,7 @@
 # Copyright © 2022 Frequenz Energy-as-a-Service GmbH
 
 """Defines the electrical components that can be used in a microgrid."""
+
 from __future__ import annotations
 
 import enum
diff --git a/src/frequenz/client/common/streaming/__init__.py b/src/frequenz/client/common/streaming/__init__.py
index c0981558..ec412c54 100644
--- a/src/frequenz/client/common/streaming/__init__.py
+++ b/src/frequenz/client/common/streaming/__init__.py
@@ -3,7 +3,6 @@
 
 """Type wrappers for the generated protobuf messages."""
 
-
 from enum import Enum
 
 # pylint: disable-next=no-name-in-module