diff --git a/pyproject.toml b/pyproject.toml
index eb6fd10..90fb5a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 dev = [
     "click==8.1.8",  # pinning until mypy issues blow over
-    "black==25.9.0",
+    "black==25.12.0",
     "coverage==7.11.0",
     "flake8==7.3.0",
     "hatch==1.15.1",