diff --git a/pyproject.toml b/pyproject.toml
index 058e6de..ea65acd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,10 +62,10 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.9.0", "isort == 6.1.0"]
+dev-formatting = ["black == 26.3.1", "isort == 6.1.0"]
 dev-mkdocs = [
   "Markdown == 3.10.2",
-  "black == 25.9.0",
+  "black == 26.3.1",
   "mike == 2.1.4",
   "mkdocs-gen-files == 0.6.0",
   "mkdocs-literate-nav == 0.6.2",
diff --git a/src/frequenz/client/assets/_lifetime.py b/src/frequenz/client/assets/_lifetime.py
index f47ac7a..ac320d5 100644
--- a/src/frequenz/client/assets/_lifetime.py
+++ b/src/frequenz/client/assets/_lifetime.py
@@ -3,7 +3,6 @@
 
 """Lifetime of a microgrid asset."""
 
-
 from dataclasses import dataclass
 from datetime import datetime, timezone
 
diff --git a/src/frequenz/client/assets/_location.py b/src/frequenz/client/assets/_location.py
index fea238e..5327f7f 100644
--- a/src/frequenz/client/assets/_location.py
+++ b/src/frequenz/client/assets/_location.py
@@ -3,7 +3,6 @@
 
 """Location information for a microgrid."""
 
-
 from dataclasses import dataclass
 
 
diff --git a/src/frequenz/client/assets/_microgrid_proto.py b/src/frequenz/client/assets/_microgrid_proto.py
index 7e59682..4eb8098 100644
--- a/src/frequenz/client/assets/_microgrid_proto.py
+++ b/src/frequenz/client/assets/_microgrid_proto.py
@@ -3,7 +3,6 @@
 
 """Loading of MicrogridInfo objects from protobuf messages."""
 
-
 import logging
 
 from frequenz.api.common.v1alpha8.microgrid import microgrid_pb2
diff --git a/src/frequenz/client/assets/metrics/_bounds_proto.py b/src/frequenz/client/assets/metrics/_bounds_proto.py
index a2b546f..ef6cfd7 100644
--- a/src/frequenz/client/assets/metrics/_bounds_proto.py
+++ b/src/frequenz/client/assets/metrics/_bounds_proto.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