diff --git a/pyproject.toml b/pyproject.toml
index c568e79d..0cfac9f4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,9 +73,9 @@ dev-flake8 = [
   "pydoclint == 0.6.0",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 24.10.0", "isort == 6.0.0"]
+dev-formatting = ["black == 25.1.0", "isort == 6.0.0"]
 dev-mkdocs = [
-  "black == 24.10.0",
+  "black == 25.1.0",
   "Markdown == 3.7",
   "mike == 2.1.3",
   "mkdocs-gen-files == 0.5.0",
diff --git a/src/frequenz/repo/config/version.py b/src/frequenz/repo/config/version.py
index 605ad94d..39fed3ba 100644
--- a/src/frequenz/repo/config/version.py
+++ b/src/frequenz/repo/config/version.py
@@ -99,7 +99,7 @@ def _build_tags(tags: list[str]) -> dict[str, semver.Version]:
     """
 
     def tag_not_none(
-        tag: tuple[str, semver.Version | None]
+        tag: tuple[str, semver.Version | None],
     ) -> TypeGuard[tuple[str, semver.Version]]:
         return tag[1] is not None
 
@@ -126,7 +126,7 @@ def _build_branches(branches: list[str]) -> dict[str, BranchVersion]:
     """
 
     def branch_not_none(
-        branch: tuple[str, BranchVersion | None]
+        branch: tuple[str, BranchVersion | None],
     ) -> TypeGuard[tuple[str, BranchVersion]]:
         return branch[1] is not None