diff --git a/pyproject.toml b/pyproject.toml
index 737ff6f0..64e97f97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ langgraph = [
     "langgraph-checkpoint>=3.0.0, <3.1.0"
 ]
 test = [
-    "black[jupyter]==25.12.0",
+    "black[jupyter]==26.1.0",
     "isort==7.0.0",
     "mypy==1.19.1",
     "pytest-asyncio==0.26.0",