diff --git a/pyproject.toml b/pyproject.toml
index 4718e1493..8dde45c5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "black==23.7.0",
+    "black==23.9.1",
     "coverage>=4.5.4",
     "build>=0.10.0",
     "fixit==2.0.0.post1",