diff --git a/src/west/manifest.py b/src/west/manifest.py
index 6b3b7d6e..93d31ffd 100644
--- a/src/west/manifest.py
+++ b/src/west/manifest.py
@@ -2147,7 +2147,7 @@ def _import_from_self(self, imp: Any) -> None:
         # system) with a fallback on self._ctx.project_importer.
 
         imptype = type(imp)
-        if imptype == bool:
+        if imptype is bool:
             self._malformed(f'got "self: import: {imp}" of boolean')
         elif self._ctx.import_flags & ImportFlag.IGNORE:
             # If we're ignoring imports altogether, this is fine.
@@ -2171,12 +2171,12 @@ def _import_from_self(self, imp: Any) -> None:
         self._assert_imports_ok()
         self.has_imports = True
 
-        if imptype == str:
+        if imptype is str:
             self._import_path_from_self(imp)
-        elif imptype == list:
+        elif imptype is list:
             for subimp in imp:
                 self._import_from_self(subimp)
-        elif imptype == dict:
+        elif imptype is dict:
             self._import_map_from_self(imp)
         else:
             self._malformed(
@@ -2505,16 +2505,16 @@ def _import_from_project(self, project: Project, imp: Any):
         self.has_imports = True
 
         imptype = type(imp)
-        if imptype == bool:
+        if imptype is bool:
             # We should not have been called unless the import was truthy.
             assert imp
             self._import_path_from_project(project, _WEST_YML)
-        elif imptype == str:
+        elif imptype is str:
             self._import_path_from_project(project, imp)
-        elif imptype == list:
+        elif imptype is list:
             for subimp in imp:
                 self._import_from_project(project, subimp)
-        elif imptype == dict:
+        elif imptype is dict:
             self._import_map_from_project(project, imp)
         else:
             self._malformed(f'{project.name_and_path}: invalid import {imp} '
diff --git a/tox.ini b/tox.ini
index d342a56f..4cbe9d35 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,10 +33,12 @@ deps =
     types-PyYAML
     flake8
     mypy
+    ruff
 setenv =
     # For instance: ./.tox/py3/tmp/
     TOXTEMPDIR={envtmpdir}
 commands =
   python -m pytest --cov-report=html --cov=west {posargs:tests} --basetemp='{envtmpdir}/pytest with space/'
   python -m flake8 --config='{toxinidir}'/tox.ini '{toxinidir}'
+  python -m ruff check '{toxinidir}'
   python -m mypy --config-file='{toxinidir}'/tox.ini --package=west