diff --git a/ai/slackbot-mcp-client/rich-responses/mcp-apps/requirements.txt b/ai/slackbot-mcp-client/rich-responses/mcp-apps/requirements.txt
index ae27718..a7b3cce 100644
--- a/ai/slackbot-mcp-client/rich-responses/mcp-apps/requirements.txt
+++ b/ai/slackbot-mcp-client/rich-responses/mcp-apps/requirements.txt
@@ -2,7 +2,7 @@ httpx2==2.5.0
 mcp==1.28.1
 mypy==2.2.0
 pytest==9.1.1
-ruff==0.15.20
+ruff==0.15.21
 slack_bolt==1.29.0
 slack_cli_hooks==0.3.0
 slack_sdk==3.43.0