diff --git a/services/flask-backend/requirements.txt b/services/flask-backend/requirements.txt
index f2f04a8f..1e13735d 100644
--- a/services/flask-backend/requirements.txt
+++ b/services/flask-backend/requirements.txt
@@ -45,6 +45,6 @@ httpx==0.28.1
 pytest==8.3.4
 pytest-cov==6.0.0
 pytest-asyncio==0.25.0
-black==24.10.0
+black==26.3.1
 flake8==7.1.1
 mypy==1.14.0