diff --git a/requirements.txt b/requirements.txt
index c57a55f..546ca4c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # lint
-black==22.12.0
+black==23.1.0
 
 # atcoder
 online-judge-tools==11.5.1