diff --git a/requirements.txt b/requirements.txt
index 1587d5f..5692259 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ dash-mantine-components>=2.8.0
 dash-ag-grid
 
 # Default backend (Flask is bundled but pinned here for clarity)
-flask>=3.0.0
+flask>=3.1.3
 
 # Optional backends (uncomment / install to use):
 #   pip install "dash[fastapi]"   -> FastAPI backend (async, websockets, MCP-friendly)