diff --git a/pyproject.toml b/pyproject.toml
index 61ed8c3e..feb629db 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ quote-style = "preserve"
 [tool.ruff.lint]
 # Enable pycodestyle (`E`) and Pyflakes (`F`) codes by default.
 select = [
-#    "C90", # mccabe
+    "C90", # mccabe
     "E", # pycodestyle
     "F", # Pyflakes
     "I", # isort
@@ -63,4 +63,4 @@ dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 
 [tool.ruff.lint.mccabe]
 # Unlike Flake8, default to a complexity level of 10.
-max-complexity = 18
\ No newline at end of file
+max-complexity = 21
\ No newline at end of file