diff --git a/src/vocalinux/main.py b/src/vocalinux/main.py
index b8c093f..f842d04 100644
--- a/src/vocalinux/main.py
+++ b/src/vocalinux/main.py
@@ -29,9 +29,10 @@ def _should_append_trailing_space() -> bool:
     """Return whether completed transcriptions should get a trailing space.
 
     Reads config.json from disk on each call so Settings toggles take effect
-    immediately. TrayIndicator and main() each construct their own
-    ConfigManager, so an in-memory read from main's instance would miss
-    Settings writes (same pattern as TextInjector._should_copy_to_clipboard).
+    immediately. Historically TrayIndicator and main() each constructed their
+    own ConfigManager, so an in-memory read would miss Settings writes; the
+    instance is shared now, but the disk read stays as the conservative path
+    (same pattern as TextInjector._should_copy_to_clipboard).
     """
     try:
         import json
@@ -325,7 +326,7 @@ def main():
     from .text_injection import text_injector
     from .ui import tray_indicator
     from .ui.action_handler import ActionHandler
-    from .ui.config_manager import ConfigManager
+    from .ui.config_manager import get_shared_config_manager
     from .ui.logging_manager import initialize_logging
 
     # Initialize logging manager early
@@ -342,7 +343,7 @@ def main():
     except Exception as e:
         logger.debug(f"Could not start IBus daemon: {e}")
 
-    config_manager = ConfigManager()
+    config_manager = get_shared_config_manager()
     saved_settings = config_manager.get_settings().get("speech_recognition", {})
     audio_settings = config_manager.get_settings().get("audio", {})
 
@@ -501,8 +502,7 @@ def main():
 
                 text_to_inject = capitalize_sentences(text_to_inject)
 
-            # Read from disk so the Settings toggle applies without restart
-            # (main and tray each own a ConfigManager instance).
+            # Read from disk so the Settings toggle applies without restart.
             append_trailing_space = _should_append_trailing_space()
 
             if append_trailing_space:
diff --git a/src/vocalinux/ui/audio_feedback.py b/src/vocalinux/ui/audio_feedback.py
index d78d5d0..230957b 100644
--- a/src/vocalinux/ui/audio_feedback.py
+++ b/src/vocalinux/ui/audio_feedback.py
@@ -59,18 +59,18 @@ ERROR_SOUND = _resource_manager.get_sound_path("error")
 
 def _is_sound_effects_enabled() -> bool:
     try:
-        from .config_manager import ConfigManager
+        from .config_manager import get_shared_config_manager
 
-        return ConfigManager().is_sound_effects_enabled()
+        return get_shared_config_manager().is_sound_effects_enabled()
     except Exception:
         return True
 
 
 def _resolved_tone() -> str:
     try:
-        from .config_manager import ConfigManager
+        from .config_manager import get_shared_config_manager
 
-        return ConfigManager().get_sound_effects_tone()
+        return get_shared_config_manager().get_sound_effects_tone()
     except Exception:
         return DEFAULT_SOUND_EFFECT_TONE
 
diff --git a/src/vocalinux/ui/config_manager.py b/src/vocalinux/ui/config_manager.py
index 333524c..dff3672 100644
--- a/src/vocalinux/ui/config_manager.py
+++ b/src/vocalinux/ui/config_manager.py
@@ -8,6 +8,7 @@ import copy
 import json
 import logging
 import os
+import threading
 from typing import Any, Optional
 
 from ..utils.paths import config_dir
@@ -487,3 +488,27 @@ class ConfigManager:
                 self._update_dict_recursive(target[key], value)
             else:
                 target[key] = value
+
+
+# The one instance the application should share. Every ConfigManager caches the
+# whole config in memory and save_config() writes that whole cache back, so two
+# live instances silently revert each other's saves — the second save wins with
+# whatever stale values it still holds. Tests may still construct ConfigManager
+# directly; application code goes through this accessor.
+_shared_instance: Optional[ConfigManager] = None
+_shared_instance_lock = threading.Lock()
+
+
+def get_shared_config_manager() -> ConfigManager:
+    """Return the process-wide ConfigManager, creating it on first use.
+
+    Creation is locked: __init__ does makedirs() plus a full load_config(),
+    so two threads racing the first call would otherwise each build their own
+    instance and reintroduce the very overwrite this accessor prevents.
+    """
+    global _shared_instance
+    if _shared_instance is None:
+        with _shared_instance_lock:
+            if _shared_instance is None:
+                _shared_instance = ConfigManager()
+    return _shared_instance
diff --git a/src/vocalinux/ui/tray_indicator.py b/src/vocalinux/ui/tray_indicator.py
index adbf52a..41c40b1 100644
--- a/src/vocalinux/ui/tray_indicator.py
+++ b/src/vocalinux/ui/tray_indicator.py
@@ -40,7 +40,7 @@ from ..suspend_handler import SuspendHandler
 from ..utils.resource_manager import ResourceManager
 from ..utils.update_checker import ReleaseInfo
 from ..utils.update_monitor import UpdateMonitor
-from .config_manager import ConfigManager
+from .config_manager import get_shared_config_manager
 from .keyboard_backends import DEFAULT_SHORTCUT, DEFAULT_SHORTCUT_MODE
 from .keyboard_shortcuts import KeyboardShortcutManager
 from .settings_dialog import SettingsDialog
@@ -104,7 +104,9 @@ class TrayIndicator:
         """
         self.speech_engine = speech_engine
         self.text_injector = text_injector
-        self.config_manager = ConfigManager()  # Added: Initialize ConfigManager
+        # Shared with main() and the settings dialog: separate instances would
+        # overwrite each other's saves with stale in-memory copies.
+        self.config_manager = get_shared_config_manager()
         self._syncing_autostart_menu = False
 
         # Get configured shortcut and mode from config
diff --git a/tests/conftest.py b/tests/conftest.py
index 21283a6..0e6963f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -140,6 +140,30 @@ def _suppress_desktop_notifications(request):
         yield
 
 
+@pytest.fixture(autouse=True)
+def _reset_shared_config_manager():
+    """Drop the process-wide ConfigManager between tests.
+
+    In production one shared instance is the point (separate instances
+    overwrite each other's saves with stale caches). In tests it would be
+    created under whichever mocks the first caller had active and then leak
+    that mock into every later test, so each test starts without one.
+    """
+    try:
+        from vocalinux.ui import config_manager as _cm
+
+        _cm._shared_instance = None
+    except Exception:
+        pass
+    yield
+    try:
+        from vocalinux.ui import config_manager as _cm
+
+        _cm._shared_instance = None
+    except Exception:
+        pass
+
+
 @pytest.fixture(autouse=True)
 def _clear_hardware_detection_cache():
     """Clear lru_cache on hardware-detection helpers between tests.
diff --git a/tests/test_audio_feedback.py b/tests/test_audio_feedback.py
index 43417c3..92691e7 100644
--- a/tests/test_audio_feedback.py
+++ b/tests/test_audio_feedback.py
@@ -419,7 +419,7 @@ class TestAudioFeedback(unittest.TestCase):
         import vocalinux.ui.audio_feedback as audio_feedback
 
         with patch(
-            "vocalinux.ui.config_manager.ConfigManager",
+            "vocalinux.ui.config_manager.get_shared_config_manager",
             side_effect=Exception("No config"),
         ):
             result = audio_feedback._is_sound_effects_enabled()
diff --git a/tests/test_main.py b/tests/test_main.py
index 9cf9d0e..cb2e211 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -125,7 +125,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.main.check_dependencies")
     @patch("vocalinux.main.parse_arguments")
     @patch("vocalinux.main.sys.exit")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_main_exits_on_init_error(
         self, mock_init_logging, mock_config, mock_exit, mock_parse, mock_check_deps
@@ -162,7 +162,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
     @patch("vocalinux.main.logging")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_main_initializes_components(
         self,
@@ -259,7 +259,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_registered_callbacks_keep_spacing_across_processing_to_listening(
         self,
@@ -373,7 +373,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_vosk_auto_capitalize_applies_to_injected_text(
         self,
@@ -402,7 +402,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_vosk_auto_capitalize_can_be_disabled(
         self,
@@ -431,7 +431,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_whisper_skips_auto_capitalize(
         self,
@@ -462,7 +462,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
     @patch("vocalinux.main.logging")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_main_with_debug_enabled(
         self,
@@ -525,7 +525,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
     @patch("vocalinux.ui.first_run_dialog.show_first_run_dialog")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_main_first_run_later_keeps_prompt_enabled(
         self,
@@ -581,7 +581,7 @@ class TestMainModule(unittest.TestCase):
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
     @patch("vocalinux.ui.first_run_dialog.show_first_run_dialog")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_main_start_minimized_skips_first_run_prompt(
         self,
@@ -824,7 +824,7 @@ class TestMainConfigPrecedence(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_cli_args_override_config(
         self,
@@ -889,7 +889,7 @@ class TestMainConfigPrecedence(unittest.TestCase):
     @patch("vocalinux.speech_recognition.recognition_manager.SpeechRecognitionManager")
     @patch("vocalinux.text_injection.text_injector.TextInjector")
     @patch("vocalinux.ui.tray_indicator.TrayIndicator")
-    @patch("vocalinux.ui.config_manager.ConfigManager")
+    @patch("vocalinux.ui.config_manager.get_shared_config_manager")
     @patch("vocalinux.ui.logging_manager.initialize_logging")
     def test_config_used_when_no_cli_args(
         self,
@@ -1151,7 +1151,9 @@ class TestMainCallbackTrailingSpaceEdges(unittest.TestCase):
 
         stack = ExitStack()
         stack.enter_context(patch("vocalinux.main.check_dependencies", return_value=True))
-        mock_config_cls = stack.enter_context(patch("vocalinux.ui.config_manager.ConfigManager"))
+        mock_config_cls = stack.enter_context(
+            patch("vocalinux.ui.config_manager.get_shared_config_manager")
+        )
         mock_config = MagicMock()
         mock_config.get_settings.return_value = {
             "speech_recognition": {},
@@ -1195,9 +1197,15 @@ class TestMainCallbackTrailingSpaceEdges(unittest.TestCase):
         mock_args.wayland = False
         mock_args.start_minimized = False
         mock_parse.return_value = mock_args
-        main()
+        try:
+            main()
+            text_cb = mock_speech.register_text_callback.call_args.args[0]
+        except BaseException:
+            # The caller only closes the stack once it gets one back, so a
+            # failure here would leak these patches into every later test.
+            stack.close()
+            raise
 
-        text_cb = mock_speech.register_text_callback.call_args.args[0]
         return stack, text_cb, mock_text
 
     def test_whitespace_only_is_skipped_through_main(self):
diff --git a/tests/test_main_args_deps.py b/tests/test_main_args_deps.py
index 99ff9f2..95012b8 100644
--- a/tests/test_main_args_deps.py
+++ b/tests/test_main_args_deps.py
@@ -298,10 +298,10 @@ class TestMainFunction(unittest.TestCase):
         """Test main() when another instance is already running."""
         from vocalinux.main import main
 
-        mock_single_instance = MagicMock()
-        mock_single_instance.acquire_lock.return_value = False
-
-        with patch.dict(sys.modules, {"vocalinux.single_instance": mock_single_instance}):
+        # Patch the function itself: main() binds the module via the package
+        # attribute, so a patch.dict(sys.modules, ...) entry is ignored whenever
+        # an earlier test already imported the real vocalinux.single_instance.
+        with patch("vocalinux.single_instance.acquire_lock", return_value=False):
             with pytest.raises(SystemExit) as exc_info:
                 main()
             assert exc_info.value.code == 1
diff --git a/tests/test_main_edge_cases.py b/tests/test_main_edge_cases.py
index 26402b7..70f56ee 100644
--- a/tests/test_main_edge_cases.py
+++ b/tests/test_main_edge_cases.py
@@ -84,10 +84,10 @@ class TestMainFunctionExtra:
         """Test that notification is attempted when another instance is running."""
         from vocalinux.main import main
 
-        mock_single_instance = MagicMock()
-        mock_single_instance.acquire_lock.return_value = False
-
-        with patch.dict(sys.modules, {"vocalinux.single_instance": mock_single_instance}):
+        # Patch the function itself: main() binds the module via the package
+        # attribute, so a patch.dict(sys.modules, ...) entry is ignored whenever
+        # an earlier test already imported the real vocalinux.single_instance.
+        with patch("vocalinux.single_instance.acquire_lock", return_value=False):
             with pytest.raises(SystemExit) as exc_info:
                 main()
             assert exc_info.value.code == 1
diff --git a/tests/test_shared_config_manager.py b/tests/test_shared_config_manager.py
new file mode 100644
index 0000000..e854bfb
--- /dev/null
+++ b/tests/test_shared_config_manager.py
@@ -0,0 +1,98 @@
+"""Tests for the process-wide shared ConfigManager."""
+
+import json
+import os
+
+import pytest
+
+from vocalinux.ui import config_manager as cm
+
+
+@pytest.fixture
+def isolated_config(tmp_path, monkeypatch):
+    """Point the config file at a temp dir and reset the shared instance."""
+    monkeypatch.setattr(cm, "CONFIG_DIR", str(tmp_path))
+    monkeypatch.setattr(cm, "CONFIG_FILE", str(tmp_path / "config.json"))
+    monkeypatch.setattr(cm, "_shared_instance", None)
+    yield tmp_path
+    cm._shared_instance = None
+
+
+def _seed_config(engine, model_size):
+    """Write a config file that both readers will load before any save."""
+    with open(cm.CONFIG_FILE, "w") as handle:
+        json.dump({"speech_recognition": {"engine": engine, "model_size": model_size}}, handle)
+
+
+def _read_config():
+    with open(cm.CONFIG_FILE) as handle:
+        return json.load(handle)
+
+
+def test_accessor_returns_one_instance(isolated_config):
+    assert cm.get_shared_config_manager() is cm.get_shared_config_manager()
+
+
+def test_saves_through_the_accessor_do_not_revert_each_other(isolated_config):
+    """The failure mode of separate instances, run through the accessor.
+
+    Both handles are taken before either save, the way two collaborators
+    (tray and audio feedback) grab one at startup. With two ConfigManagers
+    the second save would win with its stale cache and revert the first
+    one's engine; one shared instance keeps every earlier save in the file.
+    """
+    _seed_config(engine="vosk", model_size="medium")
+
+    first = cm.get_shared_config_manager()
+    second = cm.get_shared_config_manager()
+    assert first is second
+
+    first.update_speech_recognition_settings({"engine": "whisper_cpp", "model_size": "small"})
+    first.save_config()
+
+    second.set("general", "autostart", True)
+    second.save_config()
+
+    on_disk = _read_config()
+    assert on_disk["speech_recognition"]["engine"] == "whisper_cpp"
+    assert on_disk["speech_recognition"]["model_size"] == "small"
+    assert on_disk["general"]["autostart"] is True
+
+
+def test_two_instances_still_revert_each_other(isolated_config):
+    """Characterization of the bug the accessor exists to prevent (#689).
+
+    Constructing ConfigManager directly is still possible, and it still
+    loses writes. This is what the production call sites used to do, and
+    what a future one would reintroduce.
+    """
+    _seed_config(engine="vosk", model_size="medium")
+
+    first = cm.ConfigManager()
+    second = cm.ConfigManager()
+
+    first.update_speech_recognition_settings({"engine": "whisper_cpp", "model_size": "small"})
+    first.save_config()
+
+    second.set("general", "autostart", True)
+    second.save_config()
+
+    on_disk = _read_config()
+    assert on_disk["speech_recognition"]["engine"] == "vosk"
+    assert on_disk["speech_recognition"]["model_size"] == "medium"
+
+
+def test_application_code_does_not_construct_its_own_instance():
+    """Source guard: a direct ConfigManager() anywhere in src reintroduces the
+    stale-cache overwrite, so only the defining module may construct one."""
+    src_root = os.path.join(os.path.dirname(__file__), "..", "src", "vocalinux")
+    offenders = []
+    for root, _dirs, files in os.walk(src_root):
+        for name in files:
+            if not name.endswith(".py") or name == "config_manager.py":
+                continue
+            path = os.path.join(root, name)
+            with open(path, "r") as handle:
+                if "ConfigManager()" in handle.read():
+                    offenders.append(os.path.relpath(path, src_root))
+    assert offenders == []
diff --git a/tests/test_tray_indicator.py b/tests/test_tray_indicator.py
index 0196389..52ebde2 100644
--- a/tests/test_tray_indicator.py
+++ b/tests/test_tray_indicator.py
@@ -130,7 +130,7 @@ class TestTrayIndicator(unittest.TestCase):
         self.mock_makedirs = self.patcher_makedirs.start()
 
         # Patch ConfigManager constructor
-        self.patcher_config_manager = patch("vocalinux.ui.tray_indicator.ConfigManager")
+        self.patcher_config_manager = patch("vocalinux.ui.tray_indicator.get_shared_config_manager")
         self.mock_config_manager_class = self.patcher_config_manager.start()
         self.mock_config_manager_class.return_value = self.mock_config_manager
 
diff --git a/tests/test_tray_indicator_ext.py b/tests/test_tray_indicator_ext.py
index 8f37c27..cacde70 100644
--- a/tests/test_tray_indicator_ext.py
+++ b/tests/test_tray_indicator_ext.py
@@ -72,7 +72,7 @@ class TestTrayIndicatorInitialization(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -126,7 +126,7 @@ class TestTrayIndicatorInitialization(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -193,7 +193,7 @@ class TestTrayIndicatorMenuOperations(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -232,7 +232,7 @@ class TestTrayIndicatorMenuOperations(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -293,7 +293,7 @@ class TestTrayIndicatorStateHandling(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -332,7 +332,7 @@ class TestTrayIndicatorStateHandling(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -371,7 +371,7 @@ class TestTrayIndicatorStateHandling(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -432,7 +432,7 @@ class TestTrayIndicatorSignalHandling(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):
 
@@ -475,7 +475,7 @@ class TestTrayIndicatorSignalHandling(unittest.TestCase):
         with (
             patch("vocalinux.ui.tray_indicator.logging"),
             patch("vocalinux.ui.tray_indicator._resource_manager") as mock_resource_manager,
-            patch("vocalinux.ui.tray_indicator.ConfigManager") as mock_config_manager,
+            patch("vocalinux.ui.tray_indicator.get_shared_config_manager") as mock_config_manager,
             patch("vocalinux.ui.tray_indicator.KeyboardShortcutManager") as mock_keyboard_manager,
         ):