diff --git a/pyproject.toml b/pyproject.toml
index 0bb3f68..e145955 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest==9.1.1",
-    "ruff==0.15.20",
+    "ruff==0.15.21",
 ]
 
 [tool.setuptools.packages.find]
diff --git a/requirements.txt b/requirements.txt
index a8a38ef..da17f1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,6 @@ slack-cli-hooks<1.0.0
 openai==2.44.0
 
 pytest==9.1.1
-ruff==0.15.20
+ruff==0.15.21
 python-dotenv==1.2.2
 slack-cli-hooks<1.0.0