diff --git a/src/services/config.py b/src/services/config.py
index 1f445b5..103c1cf 100644
--- a/src/services/config.py
+++ b/src/services/config.py
@@ -7,6 +7,7 @@ changes. It is implemented as a singleton and intended to be reused by any
 module that needs dynamic configuration.
 """
 
+import weakref
 from typing import Any, Callable, Dict, List, Optional
 
 from fabric.utils import Gio, GLib, logger, os
@@ -102,16 +103,33 @@ class ConfigService:
     def register_reload_callback(
         self, callback: Callable[[Dict[str, Any], Dict[str, Any]], None]
     ) -> None:
-        if callback not in self._reload_callbacks:
-            self._reload_callbacks.append(callback)
+        live = []
+        for ref in self._reload_callbacks:
+            existing = ref()
+            if existing is None:
+                continue
+            live.append(ref)
+            if existing == callback:
+                self._reload_callbacks = live
+                return
+        live.append(self._weak_callback_ref(callback))
+        self._reload_callbacks = live
 
     def unregister_reload_callback(
         self, callback: Callable[[Dict[str, Any], Dict[str, Any]], None]
     ) -> None:
+        self._reload_callbacks = [
+            ref
+            for ref in self._reload_callbacks
+            if ref() is not None and ref() != callback
+        ]
+
+    @staticmethod
+    def _weak_callback_ref(callback):
         try:
-            self._reload_callbacks.remove(callback)
-        except ValueError:
-            pass
+            return weakref.WeakMethod(callback)
+        except TypeError:
+            return weakref.ref(callback)
 
     @staticmethod
     def _dict_to_toml(d: dict) -> Any:
@@ -181,11 +199,17 @@ class ConfigService:
             self._load_config()
 
             # Always notify listeners on reload request to be safe
-            for callback in list(self._reload_callbacks):
+            alive_callbacks = []
+            for ref in self._reload_callbacks:
+                callback = ref()
+                if callback is None:
+                    continue
+                alive_callbacks.append(ref)
                 try:
                     callback(self._config, old_config)
                 except Exception as e:
                     logger.error(f"[ConfigService] Callback failed: {e}")
+            self._reload_callbacks = alive_callbacks
 
             self._last_notified_config = self._config.copy()
             return False
diff --git a/src/services/todo.py b/src/services/todo.py
index 93e622b..d7e7f14 100644
--- a/src/services/todo.py
+++ b/src/services/todo.py
@@ -1,6 +1,7 @@
 # Standard library imports
 import json
 import uuid
+import weakref
 from datetime import datetime
 from pathlib import Path
 
@@ -24,20 +25,37 @@ class TodoService(Service):
 
     def add_callback(self, callback):
         """Add a callback function to be notified of changes"""
-        self._callbacks.append(callback)
+        for ref in self._callbacks:
+            if ref() == callback:
+                return
+        self._callbacks.append(self._weak_callback_ref(callback))
 
     def remove_callback(self, callback):
         """Remove a callback function"""
-        if callback in self._callbacks:
-            self._callbacks.remove(callback)
+        self._callbacks = [
+            ref for ref in self._callbacks if ref() is not None and ref() != callback
+        ]
+
+    @staticmethod
+    def _weak_callback_ref(callback):
+        try:
+            return weakref.WeakMethod(callback)
+        except TypeError:
+            return weakref.ref(callback)
 
     def _notify_callbacks(self, event_type, data=None):
         """Notify all registered callbacks of changes"""
-        for callback in self._callbacks:
+        alive = []
+        for ref in self._callbacks:
+            callback = ref()
+            if callback is None:
+                continue
+            alive.append(ref)
             try:
                 callback(event_type, data)
             except Exception as e:
                 logger.error(f"Error in todo callback: {e}")
+        self._callbacks = alive
 
     def _get_todos_file_path(self):
         """Returns the path to the todos JSON file"""