diff --git a/.github/workflows/ci-lint.yaml b/.github/workflows/ci-lint.yaml
index 4ef84f8cbb..677ec10c25 100644
--- a/.github/workflows/ci-lint.yaml
+++ b/.github/workflows/ci-lint.yaml
@@ -30,7 +30,7 @@ jobs:
           uv tool install ruff
           uv tool install black
           uv tool install poethepoet
-          uv tool install ty
+          uv tool install ty==0.0.34
 
       # black doesn't catch all syntax errors, so we check them explicitly.
       - name: Check syntax errors
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0580a4b061..2084496669 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,7 +51,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install xmlschema xsdata numpy lxml pytest isodate lark networkx tabulate python-dateutil shapely
+          pip install xmlschema xsdata numpy lxml pytest isodate lark networkx tabulate python-dateutil shapely pyparsing
           pip install src/bcf --no-deps
           pip install pytest-xdist==3.8.0
 
diff --git a/nix/build-all.py b/nix/build-all.py
index cc7978d9b1..cd04bc5f24 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -125,9 +125,8 @@ ssl._create_default_https_context = ssl._create_unverified_context
 import time
 from collections.abc import Generator, Sequence
 from pathlib import Path
-from urllib.request import urlretrieve
-
 from typing import Literal, Union
+from urllib.request import urlretrieve
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
diff --git a/src/bonsai/bonsai/bim/module/model/wall.py b/src/bonsai/bonsai/bim/module/model/wall.py
index b5d2f5fa77..dd900f4a23 100644
--- a/src/bonsai/bonsai/bim/module/model/wall.py
+++ b/src/bonsai/bonsai/bim/module/model/wall.py
@@ -468,7 +468,11 @@ class ChangeExtrusionXAngle(bpy.types.Operator, tool.Ifc.Operator):
                     existing_x_angle = 0 if tool.Cad.is_x(existing_x_angle, 0, tolerance=0.001) else existing_x_angle
                     existing_x_angle = 0 if tool.Cad.is_x(existing_x_angle, pi, tolerance=0.001) else existing_x_angle
 
-                    profiles = extrusion.SweptArea.Profiles if extrusion.SweptArea.is_a("IfcCompositeProfileDef") else [extrusion.SweptArea]
+                    profiles = (
+                        extrusion.SweptArea.Profiles
+                        if extrusion.SweptArea.is_a("IfcCompositeProfileDef")
+                        else [extrusion.SweptArea]
+                    )
                     for profile in profiles:
                         coord_list = builder.get_polyline_coords(profile.OuterCurve)
                         coord_list = [
diff --git a/src/bonsai/test/tool/test_cost.py b/src/bonsai/test/tool/test_cost.py
index 3cfbe03c91..564337a8d4 100644
--- a/src/bonsai/test/tool/test_cost.py
+++ b/src/bonsai/test/tool/test_cost.py
@@ -17,20 +17,20 @@
 # along with Bonsai.  If not, see <http://www.gnu.org/licenses/>.
 
 
-import test.bim.bootstrap
 import ifcopenshell.api.cost
 
 import bonsai.core.tool
 import bonsai.tool as tool
 import test.bim.bootstrap
+from bonsai.tool.cost import Cost as subject
 from test.bim.bootstrap import NewFile
 
-from bonsai.tool.cost import Cost as subject
 
 class TestImplementsTool(NewFile):
     def test_run(self):
         assert isinstance(subject(), bonsai.core.tool.Cost)
 
+
 class TestDisableEditingCostItemParent(NewFile):
     def test_avoid_recursion_error(newfile, monkeypatch):
         class DummyProps:
@@ -39,11 +39,7 @@ class TestDisableEditingCostItemParent(NewFile):
                 self.active_cost_item_id = 5
 
         props = DummyProps()
-        monkeypatch.setattr(
-            "bonsai.tool.Cost.get_cost_props",
-            lambda: props
-        )
+        monkeypatch.setattr("bonsai.tool.Cost.get_cost_props", lambda: props)
         subject.disable_editing_cost_item_parent()
         assert props.active_cost_item_id == 0
         assert props.change_cost_item_parent is not False
-
diff --git a/src/ifcopenshell-python/ifcopenshell/draw.py b/src/ifcopenshell-python/ifcopenshell/draw.py
index c37457d80e..7ea766ebe6 100644
--- a/src/ifcopenshell-python/ifcopenshell/draw.py
+++ b/src/ifcopenshell-python/ifcopenshell/draw.py
@@ -528,7 +528,10 @@ def main(
                     *(tup for i, tup in enumerate(zip(path_objects, section_polies, polies)) if has_relevant_zone(i))
                 )
 
-            arranged = W.arrange_polygons(*filter(None, (ARRANGE_POLYGON_SETTINGS,)), polies)
+            arranged = W.arrange_polygons(
+                *filter(None, (ARRANGE_POLYGON_SETTINGS,)),
+                polies,  # ty: ignore[too-many-positional-arguments]
+            )
             svg_data_3 = W.polygons_to_svg(arranged, False)
             dom3 = parseString(svg_data_3)
             svg3 = dom3.childNodes[0]
diff --git a/src/ifcopenshell-python/ifcopenshell/ifcopenshell_wrapper.pyi b/src/ifcopenshell-python/ifcopenshell/ifcopenshell_wrapper.pyi
index 777c00d106..84f0b5aa2d 100644
--- a/src/ifcopenshell-python/ifcopenshell/ifcopenshell_wrapper.pyi
+++ b/src/ifcopenshell-python/ifcopenshell/ifcopenshell_wrapper.pyi
@@ -1687,7 +1687,7 @@ class type_declaration(declaration):
 
 class uninitialized_tag: ...
 
-def arrange_polygons(polygons): ...
+def arrange_polygons(settings, polygons): ...
 def clear_plugin_search_paths() -> None: ...
 def clear_schemas(): ...
 def construct_iterator(geometry_library, settings, file, num_threads): ...
diff --git a/src/ifcopenshell-python/pyproject.toml b/src/ifcopenshell-python/pyproject.toml
index 9bcaeeebaa..288e3e3585 100644
--- a/src/ifcopenshell-python/pyproject.toml
+++ b/src/ifcopenshell-python/pyproject.toml
@@ -21,6 +21,7 @@ dependencies = [
     "isodate",
     "python-dateutil",
     "lark",
+    "pyparsing",
     "typing-extensions",
 ]
 
diff --git a/src/ifcopenshell-python/test/util/test_cost.py b/src/ifcopenshell-python/test/util/test_cost.py
index 516a69edd0..d0f9612673 100644
--- a/src/ifcopenshell-python/test/util/test_cost.py
+++ b/src/ifcopenshell-python/test/util/test_cost.py
@@ -16,7 +16,6 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
-import pytest
 
 import ifcopenshell.api.control
 import ifcopenshell.api.cost
@@ -25,6 +24,7 @@ import ifcopenshell.api.root
 
 import ifcopenshell.util.cost as subject
 
+
 class TestGetCostItemForProduct(test.bootstrap.IFC4):
     def test_run(self):
         model = self.file
@@ -40,7 +40,7 @@ class TestGetCostItemForProduct(test.bootstrap.IFC4):
         cost_schedule = ifcopenshell.api.cost.add_cost_schedule(model)
         item1 = ifcopenshell.api.cost.add_cost_item(model, cost_schedule=cost_schedule)
         ifcopenshell.api.control.assign_control(model, related_objects=[element], relating_control=item1)
-        ifcopenshell.api.cost.remove_cost_item(model, cost_item = item1)
+        ifcopenshell.api.cost.remove_cost_item(model, cost_item=item1)
         assert list(subject.get_cost_items_for_product(element)) == []
 
     def test_no_assigned_cost_items(self):
@@ -49,4 +49,3 @@ class TestGetCostItemForProduct(test.bootstrap.IFC4):
         cost_schedule = ifcopenshell.api.cost.add_cost_schedule(model)
         item1 = ifcopenshell.api.cost.add_cost_item(model, cost_schedule=cost_schedule)
         assert list(subject.get_cost_items_for_product(element)) == []
-