diff --git a/pyproject.toml b/pyproject.toml
index b8f30ea..3a62c17 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,10 +54,10 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.12.0", "isort == 8.0.1"]
+dev-formatting = ["black == 26.3.1", "isort == 8.0.1"]
 dev-mkdocs = [
   "Markdown == 3.10.2",
-  "black == 25.12.0",
+  "black == 26.3.1",
   "mike == 2.2.0",
   "mkdocs-gen-files == 0.6.1",
   "mkdocs-literate-nav == 0.6.3",
diff --git a/tests/test_frequenz_reporting.py b/tests/test_frequenz_reporting.py
index a76f895..e4e0a42 100644
--- a/tests/test_frequenz_reporting.py
+++ b/tests/test_frequenz_reporting.py
@@ -2,6 +2,7 @@
 # Copyright © 2024 Frequenz Energy-as-a-Service GmbH
 
 """Tests for the frequenz.reporting package."""
+
 import pytest
 
 from frequenz.reporting import delete_me