diff --git a/pyproject.toml b/pyproject.toml
index dc7b2e1..9d0bf1c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,10 +45,10 @@ dev-flake8 = [
   "pydoclint == 0.8.5",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 26.3.1", "isort == 8.0.1"]
+dev-formatting = ["black == 26.5.1", "isort == 8.0.1"]
 dev-mkdocs = [
   "Markdown == 3.10.2",
-  "black == 26.3.1",
+  "black == 26.5.1",
   "mike == 2.2.0",
   "mkdocs-gen-files == 0.6.1",
   "mkdocs-literate-nav == 0.6.3",