diff --git a/launch_ros/launch_ros/actions/node.py b/launch_ros/launch_ros/actions/node.py
index aa03d751..001a4ba9 100644
--- a/launch_ros/launch_ros/actions/node.py
+++ b/launch_ros/launch_ros/actions/node.py
@@ -400,7 +400,7 @@ def _perform_substitutions(self, context: LaunchContext) -> None:
             if self.__node_namespace is not None:
                 expanded_node_namespace = perform_substitutions(
                     context, normalize_to_list_of_substitutions(self.__node_namespace))
-            base_ns = context.launch_configurations.get('ros_namespace', None)
+            base_ns = context.get_locals_as_dict().get('ros_namespace', None)
             expanded_node_namespace = make_namespace_absolute(
                 prefix_namespace(base_ns, expanded_node_namespace))
             if expanded_node_namespace is not None:
@@ -468,7 +468,7 @@ def _perform_substitutions(self, context: LaunchContext) -> None:
                 cmd_extension = ['--params-file' if is_file else '-p', f'{param_argument}']
                 self.cmd.extend([normalize_to_list_of_substitutions(x) for x in cmd_extension])
         # expand remappings too
-        global_remaps = context.launch_configurations.get('ros_remaps', None)
+        global_remaps = context.get_locals_as_dict().get('ros_remaps', None)
         if global_remaps or self.__remappings:
             self.__expanded_remappings = []
         if global_remaps:
diff --git a/launch_ros/launch_ros/actions/push_ros_namespace.py b/launch_ros/launch_ros/actions/push_ros_namespace.py
index ad53d027..330e5be3 100644
--- a/launch_ros/launch_ros/actions/push_ros_namespace.py
+++ b/launch_ros/launch_ros/actions/push_ros_namespace.py
@@ -67,7 +67,7 @@ def namespace(self) -> List[Substitution]:
     def execute(self, context: LaunchContext):
         """Execute the action."""
         pushed_namespace = perform_substitutions(context, self.namespace)
-        previous_namespace = context.launch_configurations.get('ros_namespace', None)
+        previous_namespace = context.get_locals_as_dict().get('ros_namespace', None)
         namespace = make_namespace_absolute(
             prefix_namespace(previous_namespace, pushed_namespace))
         try:
@@ -79,4 +79,4 @@ def execute(self, context: LaunchContext):
                     previous_namespace, pushed_namespace
                 )
             )
-        context.launch_configurations['ros_namespace'] = namespace
+        context.extend_locals({'ros_namespace': namespace})
diff --git a/launch_ros/launch_ros/actions/set_remap.py b/launch_ros/launch_ros/actions/set_remap.py
index 1fb26c6e..2d02a83d 100644
--- a/launch_ros/launch_ros/actions/set_remap.py
+++ b/launch_ros/launch_ros/actions/set_remap.py
@@ -88,6 +88,6 @@ def execute(self, context: LaunchContext):
         """Execute the action."""
         src = perform_substitutions(context, self.__src)
         dst = perform_substitutions(context, self.__dst)
-        global_remaps = context.launch_configurations.get('ros_remaps', [])
+        global_remaps = context.get_locals_as_dict().get('ros_remaps', [])
         global_remaps.append((src, dst))
-        context.launch_configurations['ros_remaps'] = global_remaps
+        context.extend_locals({'ros_remaps': global_remaps})