diff --git a/pyproject.toml b/pyproject.toml
index 62a787f..88d3c9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,9 +46,9 @@ dev-flake8 = [
   "pydocstyle == 6.3.0",
   "frequenz-client-base",
 ]
-dev-formatting = ["black == 25.12.0", "isort == 7.0.0"]
+dev-formatting = ["black == 26.3.1", "isort == 7.0.0"]
 dev-mkdocs = [
-  "black == 25.12.0",
+  "black == 26.3.1",
   "Markdown==3.10.2",
   "mike == 2.1.4",
   "mkdocs-gen-files == 0.5.0",