diff --git a/claude-agent-sdk/pyproject.toml b/claude-agent-sdk/pyproject.toml
index 5b5d18d..fcb5b2f 100644
--- a/claude-agent-sdk/pyproject.toml
+++ b/claude-agent-sdk/pyproject.toml
@@ -18,7 +18,7 @@ test = [
 ]
 dev = [
     "bolt-python-support-agent-claude[test]",
-    "ruff==0.16.3",
+    "ruff==0.16.4",
 ]
 
 [tool.setuptools.packages.find]