diff --git a/.github/workflows/python_tests.yml b/.github/workflows/python_tests.yml
index f66f3bd..1140ef2 100644
--- a/.github/workflows/python_tests.yml
+++ b/.github/workflows/python_tests.yml
@@ -31,7 +31,7 @@ jobs:
           pip install --editable ".[dev]"
       - run: ./gyp -V && ./gyp --version && gyp -V && gyp --version
       - name: Lint with ruff  # See pyproject.toml for settings
-        run: ruff --output-format=github .
+        run: ruff check --output-format=github .
       - name: Test with pytest  # See pyproject.toml for settings
         run: pytest
       # - name: Run doctests with pytest
diff --git a/pylib/gyp/xcodeproj_file.py b/pylib/gyp/xcodeproj_file.py
index 33c667c..4f92cd0 100644
--- a/pylib/gyp/xcodeproj_file.py
+++ b/pylib/gyp/xcodeproj_file.py
@@ -781,7 +781,7 @@ def UpdateProperties(self, properties, do_copy=False):
             # Make sure the property conforms to the schema.
             (is_list, property_type, is_strong) = self._schema[property][0:3]
             if is_list:
-                if value.__class__ != list:
+                if not isinstance(value.__class__, list):
                     raise TypeError(
                         property
                         + " of "
@@ -791,7 +791,7 @@ def UpdateProperties(self, properties, do_copy=False):
                     )
                 for item in value:
                     if not isinstance(item, property_type) and not (
-                        isinstance(item, str) and property_type == str
+                        isinstance(item, str) and isinstance(property_type, str)
                     ):
                         # Accept unicode where str is specified.  str is treated as
                         # UTF-8-encoded.
@@ -806,7 +806,7 @@ def UpdateProperties(self, properties, do_copy=False):
                             + item.__class__.__name__
                         )
             elif not isinstance(value, property_type) and not (
-                isinstance(value, str) and property_type == str
+                isinstance(value, str) and isinstance(property_type, str)
             ):
                 # Accept unicode where str is specified.  str is treated as
                 # UTF-8-encoded.