diff --git a/pg_service_parser/core/item_models.py b/pg_service_parser/core/item_models.py
index cc05d0a..f4191d2 100644
--- a/pg_service_parser/core/item_models.py
+++ b/pg_service_parser/core/item_models.py
@@ -45,19 +45,19 @@ def remove_setting(self, index: QModelIndex):
         if self.__model_data == self.__original_data:
             self.__set_dirty_status(False)
 
-    def data(self, index, role=Qt.DisplayRole):
+    def data(self, index, role=Qt.ItemDataRole.DisplayRole):
         if not index.isValid():
             return None
 
         key = list(self.__model_data.keys())[index.row()]
-        if role == Qt.DisplayRole:
+        if role == Qt.ItemDataRole.DisplayRole:
             if index.column() == self.KEY_COL:
                 return key
             elif index.column() == self.VALUE_COL:
                 return self.__model_data[key]
-        elif role == Qt.EditRole and index.column() == self.VALUE_COL:
+        elif role == Qt.ItemDataRole.EditRole and index.column() == self.VALUE_COL:
             return self.__model_data[key]
-        elif role == Qt.FontRole:
+        elif role == Qt.ItemDataRole.FontRole:
             if index.column() == self.KEY_COL:
                 font = QFont()
                 font.setBold(True)
@@ -69,7 +69,7 @@ def data(self, index, role=Qt.DisplayRole):
                 font = QFont()
                 font.setItalic(True)
                 return font
-        elif role == Qt.ForegroundRole and index.column() == self.VALUE_COL:
+        elif role == Qt.ItemDataRole.ForegroundRole and index.column() == self.VALUE_COL:
             if (
                 key not in self.__original_data
                 or self.__model_data[key] != self.__original_data[key]
@@ -78,7 +78,7 @@ def data(self, index, role=Qt.DisplayRole):
 
         return None
 
-    def setData(self, index, value, role=Qt.EditRole) -> bool:
+    def setData(self, index, value, role=Qt.ItemDataRole.EditRole) -> bool:
         if not index.isValid():
             return False
 
@@ -98,13 +98,13 @@ def setData(self, index, value, role=Qt.EditRole) -> bool:
 
     def flags(self, idx):
         if not idx.isValid():
-            return ~Qt.ItemIsSelectable & ~Qt.ItemIsEnabled
+            return ~Qt.ItemFlag.ItemIsSelectable & ~Qt.ItemFlag.ItemIsEnabled
 
-        _flags = Qt.ItemIsSelectable | Qt.ItemIsEnabled
+        _flags = Qt.ItemFlag.ItemIsSelectable | Qt.ItemFlag.ItemIsEnabled
         if idx.column() == self.KEY_COL:
             return _flags
         elif idx.column() == self.VALUE_COL:
-            return _flags | Qt.ItemIsEditable
+            return _flags | Qt.ItemFlag.ItemIsEditable
 
     def is_dirty(self):
         return self.__dirty
diff --git a/pg_service_parser/gui/dlg_pg_service.py b/pg_service_parser/gui/dlg_pg_service.py
index ecf3f75..c4f55d1 100644
--- a/pg_service_parser/gui/dlg_pg_service.py
+++ b/pg_service_parser/gui/dlg_pg_service.py
@@ -77,14 +77,14 @@ def __initialize_dialog(self):
         self.__update_target_controls(True)
 
         self.bar = QgsMessageBar()
-        self.bar.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Fixed)
+        self.bar.setSizePolicy(QSizePolicy.Policy.Minimum, QSizePolicy.Policy.Fixed)
         self.layout().insertWidget(0, self.bar)
 
     @pyqtSlot()
     def __create_file_clicked(self):
         dlg = ServiceNameDialog(self)
-        dlg.exec_()
-        if dlg.result() == QDialog.Accepted:
+        dlg.exec()
+        if dlg.result() == QDialog.DialogCode.Accepted:
             Path.touch(self.__conf_file_path)
             add_new_service(dlg.service_name)
 
@@ -109,7 +109,7 @@ def __source_service_changed(self, index):
 
         model = self.cboTargetService.model()
         item = model.item(index + 1)  # Account for the first (empty) item
-        item.setFlags(item.flags() & ~Qt.ItemIsEnabled)  # Disable mirror item
+        item.setFlags(item.flags() & ~Qt.ItemFlag.ItemIsEnabled)  # Disable mirror item
 
         self.cboTargetService.setCurrentText(current_text)
 
@@ -182,10 +182,10 @@ def __edit_service_changed(self, index):
                     "There are pending edits for service '{}'. Are you sure you want to discard them?".format(
                         self.__edit_model.service_name()
                     ),
-                    QMessageBox.Yes | QMessageBox.No,
-                    QMessageBox.No,
+                    QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
+                    QMessageBox.StandardButton.No,
                 )
-                == QMessageBox.Yes
+                == QMessageBox.StandardButton.Yes
             ):
 
                 self.cboEditService.blockSignals(True)
@@ -208,7 +208,7 @@ def __edit_service_changed(self, index):
     @pyqtSlot()
     def __add_settings_clicked(self):
         dlg = ServiceSettingsDialog(self, self.__edit_model.current_setting_keys())
-        dlg.exec_()
+        dlg.exec()
 
         if dlg.settings_to_add:
             settings = {k: v for k, v in SERVICE_SETTINGS.items() if k in dlg.settings_to_add}
@@ -224,10 +224,10 @@ def __remove_setting_clicked(self):
                     self,
                     "Remove service setting",
                     f"Are you sure you want to remove the '{setting_key}' setting?",
-                    QMessageBox.Yes | QMessageBox.No,
-                    QMessageBox.No,
+                    QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
+                    QMessageBox.StandardButton.No,
                 )
-                == QMessageBox.Yes
+                == QMessageBox.StandardButton.Yes
             ):
                 self.__edit_model.remove_setting(selected_indexes[0])
 
diff --git a/pg_service_parser/pg_service_parser_plugin.py b/pg_service_parser/pg_service_parser_plugin.py
index 92a987d..36f5cde 100644
--- a/pg_service_parser/pg_service_parser_plugin.py
+++ b/pg_service_parser/pg_service_parser_plugin.py
@@ -27,4 +27,4 @@ def unload(self):
 
     def run(self):
         dlg = PgServiceDialog(self.iface.mainWindow())
-        dlg.exec_()
+        dlg.exec()