diff --git a/services/agent/requirements-dev.txt b/services/agent/requirements-dev.txt
index 4f0161d..3e7608d 100644
--- a/services/agent/requirements-dev.txt
+++ b/services/agent/requirements-dev.txt
@@ -1,6 +1,6 @@
 -r requirements.txt
 pytest>=8.0,<9
-ruff>=0.15.22,<1
+ruff>=0.16.4,<1
 httpx>=0.28.1,<1
 
 # Local graph debugging: `langgraph dev` + free LangGraph Studio (Epic 1).