diff --git a/.ruff.toml b/.ruff.toml
index 273282b9..89f99f90 100644
--- a/.ruff.toml
+++ b/.ruff.toml
@@ -1,4 +1,5 @@
 select = [
+  "C90", # mccabe
   "E", # pycodestyle errors
   "F", # pyflakes errors
   "I", # isort