diff --git a/pyproject.toml b/pyproject.toml
index ef28dca1..37b0592f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ lint = [
   "mypy ~= 1.1",
   # NOTE(ww): 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",
   "types-requests",
   "types-pyOpenSSL",
 ]