diff --git a/claude-agent-sdk/pyproject.toml b/claude-agent-sdk/pyproject.toml
index 8c7b35e..2a628ae 100644
--- a/claude-agent-sdk/pyproject.toml
+++ b/claude-agent-sdk/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest",
-    "ruff==0.15.2",
+    "ruff==0.15.4",
 ]
 
 [tool.setuptools.packages.find]