diff --git a/pyproject.toml b/pyproject.toml
index 3129535..16ffd97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ prometheus-xmpp-alerts = "prometheus_xmpp.__main__:main"
 
 [project.optional-dependencies]
 testing = ["pytz"]
-dev = ["ruff==0.6.8"]
+dev = ["ruff==0.6.9"]
 
 [tool.setuptools]
 packages = ["prometheus_xmpp"]