diff --git a/pyproject.toml b/pyproject.toml
index 13c5a532..8d688672 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,7 @@ version = { attr = "subsearch.data.__version__" }
 
 [project.optional-dependencies]
 optional = [
-    "black==23.11.0",
+    "black==23.12.0",
     "isort==5.13.0",
     "twine==4.0.2",
     "build==1.0.3",