Как обновлять текст label в pyqt5?

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from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout, QPushButton
from PyQt5.QtCore import QObject, pyqtSignal


class MyLabel(QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setText("Initial text")

    def update_text(self, new_text):
        self.setText(new_text)


class MyWidget(QWidget):
    def __init__(self):
        super().__init__()

        layout = QVBoxLayout()

        self.label = MyLabel()
        layout.addWidget(self.label)

        self.button = QPushButton("Update text")
        self.button.clicked.connect(self.update_label_text)
        layout.addWidget(self.button)

        self.setLayout(layout)

    def update_label_text(self):
        new_text = "New text"
        self.label.update_text(new_text)


if __name__ == "__main__":
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()