diff --git a/ixmp/backend/io.py b/ixmp/backend/io.py
index e4461e777..92b6e2c1a 100644
--- a/ixmp/backend/io.py
+++ b/ixmp/backend/io.py
@@ -174,7 +174,7 @@ def maybe_init_item(scenario, ix_type, name, new_idx, path):
             raise ValueError from None
 
 
-# FIXME reduce complexity from 26 to <=15
+# FIXME reduce complexity 22 → ≤13
 def s_read_excel(  # noqa: C901
     be, s, path, add_units=False, init_items=False, commit_steps=False
 ):
diff --git a/ixmp/backend/jdbc.py b/ixmp/backend/jdbc.py
index f93b4069b..671276168 100644
--- a/ixmp/backend/jdbc.py
+++ b/ixmp/backend/jdbc.py
@@ -965,7 +965,7 @@ def item_index(self, s, name, sets_or_names):
         jitem = self._get_item(s, "item", name, load=False)
         return list(getattr(jitem, f"getIdx{sets_or_names.title()}")())
 
-    # FIXME reduce complexity from 19 to <=15
+    # FIXME reduce complexity 18 → ≤13
     def item_get_elements(self, s, type, name, filters=None):  # noqa: C901
         if filters:
             # Convert filter elements to strings
diff --git a/ixmp/core/scenario.py b/ixmp/core/scenario.py
index 97836e777..26de09b20 100644
--- a/ixmp/core/scenario.py
+++ b/ixmp/core/scenario.py
@@ -186,7 +186,7 @@ def set(
         """
         return self._backend("item_get_elements", "set", name, filters)
 
-    # FIXME reduce complexity from 17 to <=15
+    # FIXME reduce complexity 18 → ≤13
     def add_set(  # noqa: C901
         self,
         name: str,
@@ -535,7 +535,8 @@ def list_items(
     #: List all defined variables. See :meth:`list_items`.
     var_list = partialmethod(list_items, ItemType.VAR)
 
-    def add_par(
+    # FIXME reduce complexity 15 → ≤13
+    def add_par(  # noqa: C901
         self,
         name: str,
         key_or_data: Optional[Union[str, Sequence[str], Dict, pd.DataFrame]] = None,
diff --git a/pyproject.toml b/pyproject.toml
index 921e71973..421a53896 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -109,10 +109,11 @@ markers = [
 [tool.ruff.lint]
 select = ["C9", "E", "F", "I", "W"]
 # FIXME the following exceed this limit
-# .backend.io.s_read_excel: 26
-# .backend.jdbc.JDBCBackend.item_get_elements: 19
-# .core.scenario.Scenario.add_set: 17
-mccabe.max-complexity = 15
+# .backend.io.s_read_excel: 22
+# .backend.jdbc.JDBCBackend.item_get_elements: 18
+# .core.scenario.Scenario.add_par: 15
+# .core.scenario.Scenario.add_set: 18
+mccabe.max-complexity = 13
 
 [tool.setuptools.packages]
 find = {}