diff --git a/pyproject.toml b/pyproject.toml
index 1578d3361..df15081b2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -288,7 +288,7 @@ dev = [
     "Sphinx-Substitution-Extensions==2022.2.16",
     "Sphinx==7.2.5",
     "VWS-Test-Fixtures==2023.3.5",
-    "black==23.7.0",
+    "black==23.9.1",
     "check-manifest==0.49",
     "dirty-equals==0.6.0",
     # We pin to an old doc8 to avoid version conflicts with sphinx_toolbox.