diff --git a/pyproject.toml b/pyproject.toml
index b4817619..264a7731 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ requires-python = ">=3.11"
 lint = [
     # NOTE: ruff is under active development, so we pin conservatively here
     # and let Dependabot periodically perform this update.
-    "ruff < 0.6.3",
+    "ruff < 0.6.4",
     "mypy >= 1.0",
     "types-pyyaml",
     "types-pyOpenSSL",