diff --git a/devservices/utils/supervisor.py b/devservices/utils/supervisor.py
index 5e2a0317..a831c61c 100644
--- a/devservices/utils/supervisor.py
+++ b/devservices/utils/supervisor.py
@@ -184,13 +184,21 @@ def start_supervisor_daemon(self) -> None:
         try:
             client = self._get_rpc_client()
             client.supervisor.getState()
-            # Supervisor is already running, restart it since config may have changed
-            client.supervisor.restart()
+            # Supervisor is already running, run supervisord update to update config and restart running processes
+            # Notes:
+            # - xmlrpc.client.reloadConfig does not work well here as config changes don't appear to be reloaded, so we use `supervisorctl update` instead
+            # - processes that are edited/added will not be automatically started
+            subprocess.run(
+                ["supervisorctl", "-c", self.config_file_path, "update"],
+                check=True,
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+            )
 
-            # Wait for supervisor to be ready after restart
+            # Wait for supervisor to be ready after config reload
             self._wait_for_supervisor_ready()
             return
-        except xmlrpc.client.Fault as e:
+        except (xmlrpc.client.Fault, subprocess.CalledProcessError) as e:
             capture_exception(e, level="info")
             pass
         except (SupervisorConnectionError, socket.error, ConnectionRefusedError):
diff --git a/tests/utils/test_supervisor.py b/tests/utils/test_supervisor.py
index e0e3e055..8ac8502c 100644
--- a/tests/utils/test_supervisor.py
+++ b/tests/utils/test_supervisor.py
@@ -195,8 +195,13 @@ def test_start_supervisor_daemon_already_running(
     }
     supervisor_manager.start_supervisor_daemon()
     assert mock_rpc_client.return_value.supervisor.getState.call_count == 2
-    assert mock_rpc_client.return_value.supervisor.restart.call_count == 1
-    assert mock_subprocess_run.call_count == 0
+    mock_subprocess_run.assert_called_with(
+        ["supervisorctl", "-c", supervisor_manager.config_file_path, "update"],
+        check=True,
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+    mock_subprocess_run.assert_called_once()
 
 
 @mock.patch("devservices.utils.supervisor.subprocess.run")