diff --git a/bec_widgets/utils/bec_widget.py b/bec_widgets/utils/bec_widget.py
index 0a132ad67..eaa1efaeb 100644
--- a/bec_widgets/utils/bec_widget.py
+++ b/bec_widgets/utils/bec_widget.py
@@ -40,7 +40,6 @@ def __init__(
         client=None,
         config: ConnectionConfig = None,
         gui_id: str | None = None,
-        theme_update: bool = False,
         start_busy: bool = False,
         **kwargs,
     ):
@@ -53,19 +52,17 @@ def __init__(
         >>>         super().__init__(parent=parent, client=client, config=config, gui_id=gui_id)
 
 
+        Every BECWidget follows application theme changes; override ``apply_theme`` to react.
+
         Args:
             client(BECClient, optional): The BEC client.
             config(ConnectionConfig, optional): The connection configuration.
             gui_id(str, optional): The GUI ID.
-            theme_update(bool, optional): Whether to subscribe to theme updates. Defaults to False. When set to True, the
-                widget's apply_theme method will be called when the theme changes.
         """
         super().__init__(client=client, config=config, gui_id=gui_id, **kwargs)
         if not isinstance(self, QObject):
             raise RuntimeError(f"{repr(self)} is not a subclass of QWidget")
-        if theme_update:
-            logger.debug(f"Subscribing to theme updates for {self.__class__.__name__}")
-            self._connect_to_theme_change()
+        self._connect_to_theme_change()
 
         # Initialize optional busy loader overlay utility (lazy by default)
         self._busy_overlay: "BusyLoaderOverlay" | None = None
diff --git a/bec_widgets/utils/busy_loader.py b/bec_widgets/utils/busy_loader.py
index 9784c6cea..07567074e 100644
--- a/bec_widgets/utils/busy_loader.py
+++ b/bec_widgets/utils/busy_loader.py
@@ -269,7 +269,7 @@ def install_busy_loader(
 
     class DemoWidget(BECWidget, QWidget):  # pragma: no cover
         def __init__(self, parent=None, start_busy: bool = False):
-            super().__init__(parent=parent, theme_update=True, start_busy=start_busy)
+            super().__init__(parent=parent, start_busy=start_busy)
 
             self._title = QLabel("Demo Content", self)
             self._title.setAlignment(Qt.AlignCenter)
diff --git a/bec_widgets/utils/forms_from_types/forms.py b/bec_widgets/utils/forms_from_types/forms.py
index 1f364a018..f8a37df25 100644
--- a/bec_widgets/utils/forms_from_types/forms.py
+++ b/bec_widgets/utils/forms_from_types/forms.py
@@ -215,7 +215,7 @@ def __init__(
         self._layout.addWidget(self._validity)
         self.value_changed.connect(self.validate_form)
 
-        self._connect_to_theme_change()
+        self._connect_pretty_display_theme()
 
     @SafeSlot()
     def clear(self): ...
@@ -224,8 +224,8 @@ def set_pretty_display_theme(self, theme: str = "dark"):
         if self._pretty_display:
             self.setStyleSheet(styles.pretty_display_theme(theme))
 
-    def _connect_to_theme_change(self):
-        """Connect to the theme change signal."""
+    def _connect_pretty_display_theme(self):
+        """Connect the pretty-display styling to the theme-updated signal."""
         qapp = QApplication.instance()
         if hasattr(qapp, "theme_signal"):
             qapp.theme_signal.theme_updated.connect(self.set_pretty_display_theme)  # type: ignore
diff --git a/bec_widgets/utils/help_inspector/help_inspector.py b/bec_widgets/utils/help_inspector/help_inspector.py
index 95a99a2ee..94839da13 100644
--- a/bec_widgets/utils/help_inspector/help_inspector.py
+++ b/bec_widgets/utils/help_inspector/help_inspector.py
@@ -36,7 +36,7 @@ class HelpInspector(BECWidget, QtWidgets.QWidget):
     bec_widget_help = QtCore.Signal(str)  # Emits md formatted help string from BECWidget class
 
     def __init__(self, parent=None, client=None):
-        super().__init__(client=client, parent=parent, theme_update=True)
+        super().__init__(client=client, parent=parent)
         self._app = QtWidgets.QApplication.instance()
         layout = QtWidgets.QHBoxLayout(self)  # type: ignore
         layout.setContentsMargins(0, 0, 0, 0)
diff --git a/bec_widgets/utils/palette_viewer.py b/bec_widgets/utils/palette_viewer.py
index 766cf96a8..6398cea95 100644
--- a/bec_widgets/utils/palette_viewer.py
+++ b/bec_widgets/utils/palette_viewer.py
@@ -25,7 +25,7 @@ class PaletteViewer(BECWidget, QWidget):
     RPC = False
 
     def __init__(self, *args, parent=None, **kwargs):
-        super().__init__(parent=parent, theme_update=True, **kwargs)
+        super().__init__(parent=parent, **kwargs)
         self.setFixedSize(400, 600)
         layout = QVBoxLayout(self)
         dark_mode_button = DarkModeButton(self)
diff --git a/bec_widgets/widgets/containers/main_window/main_window.py b/bec_widgets/widgets/containers/main_window/main_window.py
index 3b99340e7..6753c8458 100644
--- a/bec_widgets/widgets/containers/main_window/main_window.py
+++ b/bec_widgets/widgets/containers/main_window/main_window.py
@@ -73,7 +73,6 @@ def __init__(self, parent=None, window_title: str = "BEC", **kwargs):
 
         # Init ui
         self._init_ui()
-        self._connect_to_theme_change()
 
         # Connections to BEC Notifications
         self.bec_dispatcher.connect_slot(
diff --git a/bec_widgets/widgets/control/device_input/device_combobox/device_combobox.py b/bec_widgets/widgets/control/device_input/device_combobox/device_combobox.py
index c10807a21..cc304a69e 100644
--- a/bec_widgets/widgets/control/device_input/device_combobox/device_combobox.py
+++ b/bec_widgets/widgets/control/device_input/device_combobox/device_combobox.py
@@ -155,14 +155,7 @@ def __init__(
         **kwargs,
     ):
         self.config = self._process_config(config)
-        super().__init__(
-            parent=parent,
-            client=client,
-            config=self.config,
-            gui_id=gui_id,
-            theme_update=True,
-            **kwargs,
-        )
+        super().__init__(parent=parent, client=client, config=self.config, gui_id=gui_id, **kwargs)
         self.get_bec_shortcuts()
 
         self._device_filter: list[BECDeviceFilter] = []
diff --git a/bec_widgets/widgets/control/device_manager/components/ophyd_validation/ophyd_validation.py b/bec_widgets/widgets/control/device_manager/components/ophyd_validation/ophyd_validation.py
index a2cae41a0..7d788d743 100644
--- a/bec_widgets/widgets/control/device_manager/components/ophyd_validation/ophyd_validation.py
+++ b/bec_widgets/widgets/control/device_manager/components/ophyd_validation/ophyd_validation.py
@@ -309,7 +309,7 @@ class OphydValidation(BECWidget, QtWidgets.QWidget):
     multiple_validations_completed = QtCore.Signal(list)
 
     def __init__(self, parent=None, client=None, hide_legend: bool = False):
-        super().__init__(parent=parent, client=client, theme_update=True)
+        super().__init__(parent=parent, client=client)
         self._running_ophyd_tests = False
         self._keep_visible_after_validation: list[str] = []
         if not READY_TO_TEST:
diff --git a/bec_widgets/widgets/editors/monaco/monaco_widget.py b/bec_widgets/widgets/editors/monaco/monaco_widget.py
index 6d70244a7..f2cbe2c5b 100644
--- a/bec_widgets/widgets/editors/monaco/monaco_widget.py
+++ b/bec_widgets/widgets/editors/monaco/monaco_widget.py
@@ -55,9 +55,7 @@ class MonacoWidget(BECWidget, QWidget):
     def __init__(
         self, parent=None, config=None, client=None, gui_id=None, init_lsp: bool = True, **kwargs
     ):
-        super().__init__(
-            parent=parent, client=client, gui_id=gui_id, config=config, theme_update=True, **kwargs
-        )
+        super().__init__(parent=parent, client=client, gui_id=gui_id, config=config, **kwargs)
         layout = QVBoxLayout()
         layout.setContentsMargins(0, 0, 0, 0)
         self.editor = qtmonaco.Monaco(self)
diff --git a/bec_widgets/widgets/plots/heatmap/heatmap.py b/bec_widgets/widgets/plots/heatmap/heatmap.py
index 8fe6e146b..432a89cb0 100644
--- a/bec_widgets/widgets/plots/heatmap/heatmap.py
+++ b/bec_widgets/widgets/plots/heatmap/heatmap.py
@@ -257,7 +257,7 @@ def __init__(self, parent=None, config: HeatmapConfig | None = None, **kwargs):
                 device_y=None,
                 device_z=None,
             )
-        super().__init__(parent=parent, config=config, theme_update=True, **kwargs)
+        super().__init__(parent=parent, config=config, **kwargs)
         self._image_config = config
         self.scan_id = None
         self.old_scan_id = None
diff --git a/bec_widgets/widgets/plots/plot_base.py b/bec_widgets/widgets/plots/plot_base.py
index c6f2c56cb..02bbc7c28 100644
--- a/bec_widgets/widgets/plots/plot_base.py
+++ b/bec_widgets/widgets/plots/plot_base.py
@@ -191,7 +191,6 @@ def __init__(
 
         self._init_ui()
 
-        self._connect_to_theme_change()
         self._update_theme(None)
 
     def apply_theme(self, theme: str):
diff --git a/bec_widgets/widgets/plots/waveform/waveform.py b/bec_widgets/widgets/plots/waveform/waveform.py
index 50fd897c1..afc4398b2 100644
--- a/bec_widgets/widgets/plots/waveform/waveform.py
+++ b/bec_widgets/widgets/plots/waveform/waveform.py
@@ -208,8 +208,6 @@ def __init__(
 
         self.update_with_scan_history(-1)
 
-        # for updating a color scheme of curves
-        self._connect_to_theme_change()
         # To fix the ViewAll action with clipToView activated
         self._connect_viewbox_menu_actions()
 
diff --git a/bec_widgets/widgets/progress/bec_progressbar/bec_progressbar.py b/bec_widgets/widgets/progress/bec_progressbar/bec_progressbar.py
index 4f75c4d16..ba77877ac 100644
--- a/bec_widgets/widgets/progress/bec_progressbar/bec_progressbar.py
+++ b/bec_widgets/widgets/progress/bec_progressbar/bec_progressbar.py
@@ -61,9 +61,7 @@ def __init__(
         enable_dynamic_stylesheet: bool = True,
         **kwargs,
     ):
-        super().__init__(
-            parent=parent, client=client, gui_id=gui_id, config=config, theme_update=True, **kwargs
-        )
+        super().__init__(parent=parent, client=client, gui_id=gui_id, config=config, **kwargs)
 
         accent_colors = get_accent_colors()
 
diff --git a/bec_widgets/widgets/progress/ring_progress_bar/ring_progress_bar.py b/bec_widgets/widgets/progress/ring_progress_bar/ring_progress_bar.py
index 3d1849699..7d1cf0187 100644
--- a/bec_widgets/widgets/progress/ring_progress_bar/ring_progress_bar.py
+++ b/bec_widgets/widgets/progress/ring_progress_bar/ring_progress_bar.py
@@ -397,7 +397,7 @@ class RingProgressBar(BECWidget, QWidget):
     ]
 
     def __init__(self, parent: QWidget | None = None, client=None, **kwargs):
-        super().__init__(parent=parent, client=client, theme_update=True, **kwargs)
+        super().__init__(parent=parent, client=client, **kwargs)
 
         self.setWindowTitle("Ring Progress Bar")
 
diff --git a/bec_widgets/widgets/services/beamline_states/beamline_state_manager.py b/bec_widgets/widgets/services/beamline_states/beamline_state_manager.py
index cf10ca27f..7aebd6a57 100644
--- a/bec_widgets/widgets/services/beamline_states/beamline_state_manager.py
+++ b/bec_widgets/widgets/services/beamline_states/beamline_state_manager.py
@@ -323,9 +323,7 @@ def __init__(
         gui_id: str | None = None,
         **kwargs,
     ) -> None:
-        super().__init__(
-            parent=parent, client=client, config=config, gui_id=gui_id, theme_update=True, **kwargs
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
         self._state_pills: dict[str, BeamlineStatePill] = {}
         self._section_headers: dict[str, _BeamlineStateSectionHeader] = {}
diff --git a/bec_widgets/widgets/services/beamline_states/beamline_state_pill.py b/bec_widgets/widgets/services/beamline_states/beamline_state_pill.py
index 5df19d7c0..679750191 100644
--- a/bec_widgets/widgets/services/beamline_states/beamline_state_pill.py
+++ b/bec_widgets/widgets/services/beamline_states/beamline_state_pill.py
@@ -85,9 +85,7 @@ def __init__(
         gui_id: str | None = None,
         **kwargs,
     ) -> None:
-        super().__init__(
-            parent=parent, client=client, config=config, gui_id=gui_id, theme_update=True, **kwargs
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         self.setObjectName("BeamlineStatePill")
         self.setAttribute(Qt.WidgetAttribute.WA_StyledBackground, True)
         self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Minimum)
diff --git a/bec_widgets/widgets/services/bec_atlas_admin_view/experiment_selection/experiment_mat_card.py b/bec_widgets/widgets/services/bec_atlas_admin_view/experiment_selection/experiment_mat_card.py
index df6f04d08..86494ce04 100644
--- a/bec_widgets/widgets/services/bec_atlas_admin_view/experiment_selection/experiment_mat_card.py
+++ b/bec_widgets/widgets/services/bec_atlas_admin_view/experiment_selection/experiment_mat_card.py
@@ -48,7 +48,7 @@ def __init__(
         title: str = "Next Experiment",
         **kwargs,
     ):
-        super().__init__(parent=parent, theme_update=True, **kwargs)
+        super().__init__(parent=parent, **kwargs)
 
         layout = QVBoxLayout(self)
         layout.setContentsMargins(12, 8, 12, 8)
diff --git a/bec_widgets/widgets/services/device_browser/device_item/device_config_form.py b/bec_widgets/widgets/services/device_browser/device_item/device_config_form.py
index a783d9883..a6585f5f8 100644
--- a/bec_widgets/widgets/services/device_browser/device_item/device_config_form.py
+++ b/bec_widgets/widgets/services/device_browser/device_item/device_config_form.py
@@ -4,7 +4,6 @@
 
 from bec_lib.atlas_models import Device as DeviceConfigModel
 from pydantic import BaseModel
-from qtpy.QtWidgets import QApplication
 
 from bec_widgets.utils.colors import get_theme_name
 from bec_widgets.utils.forms_from_types import styles
@@ -47,7 +46,6 @@ def __init__(
         pred, _ = self._widget_types["dict"]
         self._widget_types["dict"] = pred, self._custom_device_config_item
         self._validity.setVisible(True)
-        self._connect_to_theme_change()
         self.populate()
 
     def _post_init(self): ...
@@ -69,12 +67,6 @@ def get_form_data(self):
         """Get the entered metadata as a dict."""
         return self._md_schema.model_validate(super().get_form_data()).model_dump()
 
-    def _connect_to_theme_change(self):
-        """Connect to the theme change signal."""
-        qapp = QApplication.instance()
-        if hasattr(qapp, "theme_signal"):
-            qapp.theme_signal.theme_updated.connect(self.set_pretty_display_theme)  # type: ignore
-
     def set_schema(self, schema: type[BaseModel]):
         if not issubclass(schema, DeviceConfigModel):
             raise TypeError("This class doesn't support changing the schema")
diff --git a/bec_widgets/widgets/services/device_browser/device_item/device_signal_display.py b/bec_widgets/widgets/services/device_browser/device_item/device_signal_display.py
index 56a92e04b..c16305e0a 100644
--- a/bec_widgets/widgets/services/device_browser/device_item/device_signal_display.py
+++ b/bec_widgets/widgets/services/device_browser/device_item/device_signal_display.py
@@ -20,19 +20,11 @@ def __init__(
         device: str = "",
         config: ConnectionConfig = None,
         gui_id: str | None = None,
-        theme_update: bool = False,
         **kwargs,
     ):
         """A widget to display all the signals from a given device, and allow getting
         a fresh reading."""
-        super().__init__(
-            parent=parent,
-            client=client,
-            config=config,
-            gui_id=gui_id,
-            theme_update=theme_update,
-            **kwargs,
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         self.get_bec_shortcuts()
         self._layout = QVBoxLayout()
         self.setLayout(self._layout)
diff --git a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_device_viewer.py b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_device_viewer.py
index 659d7c3f5..7bf0cb08b 100644
--- a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_device_viewer.py
+++ b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_device_viewer.py
@@ -94,17 +94,9 @@ def __init__(
         client=None,
         config: ConnectionConfig = None,
         gui_id: str = None,
-        theme_update: bool = True,
         **kwargs,
     ):
-        super().__init__(
-            parent=parent,
-            client=client,
-            config=config,
-            gui_id=gui_id,
-            theme_update=theme_update,
-            **kwargs,
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         # Current scan history message
         self.scan_history_msg: ScanHistoryMessage | None = None
         self._last_device_name: str | None = None
diff --git a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_metadata_viewer.py b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_metadata_viewer.py
index 5f2455171..14b86470a 100644
--- a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_metadata_viewer.py
+++ b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_metadata_viewer.py
@@ -26,7 +26,6 @@ def __init__(
         client=None,
         config: ConnectionConfig | None = None,
         gui_id: str | None = None,
-        theme_update: bool = True,
         scan_history_msg: ScanHistoryMessage | None = None,
     ):
         """
@@ -37,12 +36,9 @@ def __init__(
             client: The BEC client.
             config (ConnectionConfig, optional): The connection configuration.
             gui_id (str, optional): The GUI ID.
-            theme_update (bool, optional): Whether to subscribe to theme updates. Defaults to True.
             scan_history_msg (ScanHistoryMessage, optional): The scan history message to display. Defaults
         """
-        super().__init__(
-            parent=parent, client=client, config=config, gui_id=gui_id, theme_update=theme_update
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id)
         self._scan_history_msg_labels = {
             "scan_id": "Scan ID",
             "dataset_number": "Dataset Nr",
diff --git a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_view.py b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_view.py
index 330242126..cd8ef9deb 100644
--- a/bec_widgets/widgets/services/scan_history_browser/components/scan_history_view.py
+++ b/bec_widgets/widgets/services/scan_history_browser/components/scan_history_view.py
@@ -89,17 +89,9 @@ def __init__(
         config: ConnectionConfig = None,
         gui_id: str = None,
         max_length: int = 100,
-        theme_update: bool = True,
         **kwargs,
     ):
-        super().__init__(
-            parent=parent,
-            client=client,
-            config=config,
-            gui_id=gui_id,
-            theme_update=theme_update,
-            **kwargs,
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         self.status_icons = self._create_status_icons()
         self.column_header = ["Scan Nr", "Scan Name", "Status"]
         self.scan_history: list[ScanHistoryMessage] = []  # newest at index 0
diff --git a/bec_widgets/widgets/services/scan_history_browser/scan_history_browser.py b/bec_widgets/widgets/services/scan_history_browser/scan_history_browser.py
index c60a92584..a282c0c11 100644
--- a/bec_widgets/widgets/services/scan_history_browser/scan_history_browser.py
+++ b/bec_widgets/widgets/services/scan_history_browser/scan_history_browser.py
@@ -24,7 +24,6 @@ def __init__(
         client=None,
         config: ConnectionConfig = None,
         gui_id: str | None = None,
-        theme_update: bool = False,
         **kwargs,
     ):
         """
@@ -35,27 +34,19 @@ def __init__(
             client: The BEC client.
             config (ConnectionConfig, optional): The connection configuration.
             gui_id (str, optional): The GUI ID.
-            theme_update (bool, optional): Whether to subscribe to theme updates. Defaults to False.
         """
-        super().__init__(
-            parent=parent,
-            client=client,
-            config=config,
-            gui_id=gui_id,
-            theme_update=theme_update,
-            **kwargs,
-        )
+        super().__init__(parent=parent, client=client, config=config, gui_id=gui_id, **kwargs)
         layout = QtWidgets.QHBoxLayout()
         self.setLayout(layout)
 
         self.scan_history_view = ScanHistoryView(
-            parent=self, client=client, config=config, gui_id=gui_id, theme_update=theme_update
+            parent=self, client=client, config=config, gui_id=gui_id
         )
         self.scan_history_metadata_viewer = ScanHistoryMetadataViewer(
-            parent=self, client=client, config=config, gui_id=gui_id, theme_update=theme_update
+            parent=self, client=client, config=config, gui_id=gui_id
         )
         self.scan_history_device_viewer = ScanHistoryDeviceViewer(
-            parent=self, client=client, config=config, gui_id=gui_id, theme_update=theme_update
+            parent=self, client=client, config=config, gui_id=gui_id
         )
 
         self.init_layout()
diff --git a/bec_widgets/widgets/utility/visual/dark_mode_button/dark_mode_button.py b/bec_widgets/widgets/utility/visual/dark_mode_button/dark_mode_button.py
index d37ee51ae..006724eb9 100644
--- a/bec_widgets/widgets/utility/visual/dark_mode_button/dark_mode_button.py
+++ b/bec_widgets/widgets/utility/visual/dark_mode_button/dark_mode_button.py
@@ -22,7 +22,7 @@ def __init__(
         toolbar: bool = False,
         **kwargs,
     ) -> None:
-        super().__init__(parent=parent, client=client, gui_id=gui_id, theme_update=True, **kwargs)
+        super().__init__(parent=parent, client=client, gui_id=gui_id, **kwargs)
         self.setProperty("skip_settings", True)
 
         self._dark_mode_enabled = False
diff --git a/tests/unit_tests/test_busy_loader.py b/tests/unit_tests/test_busy_loader.py
index 0425c78bb..ae1a4e620 100644
--- a/tests/unit_tests/test_busy_loader.py
+++ b/tests/unit_tests/test_busy_loader.py
@@ -9,10 +9,8 @@
 
 
 class _TestBusyWidget(BECWidget, QWidget):
-    def __init__(
-        self, parent=None, *, start_busy: bool = False, theme_update: bool = False, **kwargs
-    ):
-        super().__init__(parent=parent, theme_update=theme_update, start_busy=start_busy, **kwargs)
+    def __init__(self, parent=None, *, start_busy: bool = False, **kwargs):
+        super().__init__(parent=parent, start_busy=start_busy, **kwargs)
         lay = QVBoxLayout(self)
         lay.setContentsMargins(0, 0, 0, 0)
         lay.addWidget(QLabel("content", self))