diff --git a/pyproject.toml b/pyproject.toml
index 6609f0e..250a37b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ dependencies    = [
 
 [project.optional-dependencies]
 black = [
-    "black==25.11.0",
+    "black==25.12.0",
 ]
 ruff = [
     "ruff==0.14.8",
diff --git a/requirements_black.txt b/requirements_black.txt
index d653a60..edfc3ef 100644
--- a/requirements_black.txt
+++ b/requirements_black.txt
@@ -1 +1 @@
-black==25.11.0
+black==25.12.0