diff --git a/bec_widgets/utils/bec_widget.py b/bec_widgets/utils/bec_widget.py
index bdaefda1..6394c6c1 100644
--- a/bec_widgets/utils/bec_widget.py
+++ b/bec_widgets/utils/bec_widget.py
@@ -83,6 +83,8 @@ class BECWidget(BECConnector):
         if hasattr(qapp, "theme"):
             qapp.theme.theme_changed.connect(self._update_theme)
 
+    @SafeSlot(str)
+    @SafeSlot()
     def _update_theme(self, theme: str | None = None):
         """Update the theme."""
         if theme is None:
diff --git a/tests/references/SpinnerWidget/SpinnerWidget_darwin.png b/tests/references/SpinnerWidget/SpinnerWidget_darwin.png
index 2b75d66a..54bd8c5e 100644
Binary files a/tests/references/SpinnerWidget/SpinnerWidget_darwin.png and b/tests/references/SpinnerWidget/SpinnerWidget_darwin.png differ
diff --git a/tests/references/SpinnerWidget/SpinnerWidget_linux.png b/tests/references/SpinnerWidget/SpinnerWidget_linux.png
index 2b75d66a..46224121 100644
Binary files a/tests/references/SpinnerWidget/SpinnerWidget_linux.png and b/tests/references/SpinnerWidget/SpinnerWidget_linux.png differ
diff --git a/tests/references/SpinnerWidget/SpinnerWidget_started_darwin.png b/tests/references/SpinnerWidget/SpinnerWidget_started_darwin.png
index ff6827cd..85c5a244 100644
Binary files a/tests/references/SpinnerWidget/SpinnerWidget_started_darwin.png and b/tests/references/SpinnerWidget/SpinnerWidget_started_darwin.png differ
diff --git a/tests/unit_tests/test_abort_button.py b/tests/unit_tests/test_abort_button.py
index ca6c18a2..d744bd04 100644
--- a/tests/unit_tests/test_abort_button.py
+++ b/tests/unit_tests/test_abort_button.py
@@ -17,10 +17,6 @@ def abort_button(qtbot, mocked_client):
 
 def test_abort_button(abort_button):
     assert abort_button.button.text() == "Abort"
-    assert (
-        abort_button.button.styleSheet()
-        == "background-color:  #666666; color: white; font-weight: bold; font-size: 12px;"
-    )
     abort_button.button.click()
     assert abort_button.queue.request_scan_abortion.called
     abort_button.close()
diff --git a/tests/unit_tests/test_dark_mode_button.py b/tests/unit_tests/test_dark_mode_button.py
index e8a02bac..46111629 100644
--- a/tests/unit_tests/test_dark_mode_button.py
+++ b/tests/unit_tests/test_dark_mode_button.py
@@ -71,16 +71,3 @@ def test_dark_mode_button_changes_theme(dark_mode_button):
 
         dark_mode_button.toggle_dark_mode()
         mocked_set_theme.assert_called_with("light")
-
-
-def test_dark_mode_button_changes_on_os_theme_change(qtbot, dark_mode_button):
-    """
-    Test that the dark mode button changes the theme correctly when the OS theme changes.
-    """
-    qapp = QApplication.instance()
-    assert dark_mode_button.dark_mode_enabled is False
-    assert dark_mode_button.mode_button.toolTip() == "Set Dark Mode"
-    qapp.theme_signal.theme_updated.emit("dark")
-    qtbot.wait(100)
-    assert dark_mode_button.dark_mode_enabled is True
-    assert dark_mode_button.mode_button.toolTip() == "Set Light Mode"