diff --git a/spinetoolbox/resources_icons_rc.py b/spinetoolbox/resources_icons_rc.py
index 2050a4460..631f1d435 100644
--- a/spinetoolbox/resources_icons_rc.py
+++ b/spinetoolbox/resources_icons_rc.py
@@ -32602,7 +32602,7 @@
 \x00\x00\x02R\x00\x00\x00\x00\x00\x01\x00\x06A\x9c\
 \x00\x00\x01\x8f\xec\xcf\x12\xea\
 \x00\x00\x03\xf6\x00\x00\x00\x00\x00\x01\x00\x06\x978\
-\x00\x00\x01\x93D[e\x88\
+\x00\x00\x01\x93IP\xaeM\
 \x00\x00\x01\xea\x00\x00\x00\x00\x00\x01\x00\x062\x92\
 \x00\x00\x01\x8f\xec\xcf\x13\x09\
 \x00\x00\x04\x94\x00\x00\x00\x00\x00\x01\x00\x06\xaa\xa4\
@@ -32662,7 +32662,7 @@
 \x00\x00\x09z\x00\x00\x00\x00\x00\x01\x00\x07P}\
 \x00\x00\x01\x8f\xec\xcf\x12\xfa\
 \x00\x00\x08\xd8\x00\x00\x00\x00\x00\x01\x00\x07=|\
-\x00\x00\x01\x93D[e\x88\
+\x00\x00\x01\x93IP\xaeN\
 \x00\x00\x0a\x00\x00\x00\x00\x00\x00\x01\x00\x07gO\
 \x00\x00\x01\x8f\xec\xcf\x12\xfa\
 \x00\x00\x076\x00\x00\x00\x00\x00\x01\x00\x07\x0f\x05\
@@ -32736,9 +32736,9 @@
 \x00\x00\x07\xca\x00\x00\x00\x00\x00\x01\x00\x07!\x85\
 \x00\x00\x01\x8f\xec\xcf\x12\xfa\
 \x00\x00\x0b\x16\x00\x00\x00\x00\x00\x01\x00\x07\x9c\x9c\
-\x00\x00\x01\x93D[e\x89\
+\x00\x00\x01\x93IP\xaeP\
 \x00\x00\x06\xf8\x00\x00\x00\x00\x00\x01\x00\x06\xfc\x96\
-\x00\x00\x01\x93D[e\x89\
+\x00\x00\x01\x93IP\xaeO\
 \x00\x00\x0a\xfe\x00\x00\x00\x00\x00\x01\x00\x07\x9b6\
 \x00\x00\x01\x8f\xec\xcf\x12\xfa\
 \x00\x00\x06\xce\x00\x00\x00\x00\x00\x01\x00\x06\xf6R\
diff --git a/spinetoolbox/ui/mainwindow.py b/spinetoolbox/ui/mainwindow.py
index 203e40fae..6715360d0 100644
--- a/spinetoolbox/ui/mainwindow.py
+++ b/spinetoolbox/ui/mainwindow.py
@@ -241,7 +241,7 @@ def setupUi(self, MainWindow):
         sizePolicy.setHeightForWidth(self.dockWidget_eventlog.sizePolicy().hasHeightForWidth())
         self.dockWidget_eventlog.setSizePolicy(sizePolicy)
         self.dockWidget_eventlog.setMinimumSize(QSize(82, 104))
-        self.dockWidget_eventlog.setFeatures(QDockWidget.DockWidgetClosable|QDockWidget.DockWidgetFloatable|QDockWidget.DockWidgetMovable)
+        self.dockWidget_eventlog.setFeatures(QDockWidget.DockWidgetFeature.DockWidgetClosable|QDockWidget.DockWidgetFeature.DockWidgetFloatable|QDockWidget.DockWidgetFeature.DockWidgetMovable)
         self.dockWidgetContents = QWidget()
         self.dockWidgetContents.setObjectName(u"dockWidgetContents")
         sizePolicy1 = QSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
@@ -260,7 +260,7 @@ def setupUi(self, MainWindow):
         self.textBrowser_eventlog.setObjectName(u"textBrowser_eventlog")
         sizePolicy.setHeightForWidth(self.textBrowser_eventlog.sizePolicy().hasHeightForWidth())
         self.textBrowser_eventlog.setSizePolicy(sizePolicy)
-        self.textBrowser_eventlog.setContextMenuPolicy(Qt.DefaultContextMenu)
+        self.textBrowser_eventlog.setContextMenuPolicy(Qt.ContextMenuPolicy.DefaultContextMenu)
         self.textBrowser_eventlog.setOpenLinks(False)
 
         self.verticalLayout_7.addWidget(self.textBrowser_eventlog)
@@ -270,8 +270,8 @@ def setupUi(self, MainWindow):
         icon21 = QIcon()
         icon21.addFile(u":/icons/check-circle.svg", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
         self.toolButton_executions.setIcon(icon21)
-        self.toolButton_executions.setPopupMode(QToolButton.InstantPopup)
-        self.toolButton_executions.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
+        self.toolButton_executions.setPopupMode(QToolButton.ToolButtonPopupMode.InstantPopup)
+        self.toolButton_executions.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonTextBesideIcon)
 
         self.verticalLayout_7.addWidget(self.toolButton_executions)
 
@@ -291,7 +291,7 @@ def setupUi(self, MainWindow):
         self.verticalLayout_6.setContentsMargins(0, 0, 0, 0)
         self.splitter_console = QSplitter(self.dockWidgetContents_console)
         self.splitter_console.setObjectName(u"splitter_console")
-        self.splitter_console.setOrientation(Qt.Vertical)
+        self.splitter_console.setOrientation(Qt.Orientation.Vertical)
         self.splitter_console.setChildrenCollapsible(False)
         self.listView_console_executions = QTreeView(self.splitter_console)
         self.listView_console_executions.setObjectName(u"listView_console_executions")
@@ -303,8 +303,8 @@ def setupUi(self, MainWindow):
         self.splitter_console.addWidget(self.listView_console_executions)
         self.label_no_console = QLabel(self.splitter_console)
         self.label_no_console.setObjectName(u"label_no_console")
-        self.label_no_console.setContextMenuPolicy(Qt.DefaultContextMenu)
-        self.label_no_console.setAlignment(Qt.AlignCenter)
+        self.label_no_console.setContextMenuPolicy(Qt.ContextMenuPolicy.DefaultContextMenu)
+        self.label_no_console.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self.label_no_console.setWordWrap(True)
         self.splitter_console.addWidget(self.label_no_console)
 
@@ -314,7 +314,7 @@ def setupUi(self, MainWindow):
         MainWindow.addDockWidget(Qt.DockWidgetArea.BottomDockWidgetArea, self.dockWidget_console)
         self.dockWidget_design_view = QDockWidget(MainWindow)
         self.dockWidget_design_view.setObjectName(u"dockWidget_design_view")
-        self.dockWidget_design_view.setFeatures(QDockWidget.DockWidgetMovable)
+        self.dockWidget_design_view.setFeatures(QDockWidget.DockWidgetFeature.DockWidgetMovable)
         self.dockWidgetContents_5 = QWidget()
         self.dockWidgetContents_5.setObjectName(u"dockWidgetContents_5")
         self.verticalLayout_2 = QVBoxLayout(self.dockWidgetContents_5)
@@ -323,13 +323,13 @@ def setupUi(self, MainWindow):
         self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
         self.graphicsView = DesignQGraphicsView(self.dockWidgetContents_5)
         self.graphicsView.setObjectName(u"graphicsView")
-        self.graphicsView.setFrameShape(QFrame.NoFrame)
-        self.graphicsView.setFrameShadow(QFrame.Raised)
-        self.graphicsView.setRenderHints(QPainter.Antialiasing|QPainter.TextAntialiasing)
-        self.graphicsView.setDragMode(QGraphicsView.RubberBandDrag)
-        self.graphicsView.setResizeAnchor(QGraphicsView.AnchorUnderMouse)
-        self.graphicsView.setViewportUpdateMode(QGraphicsView.FullViewportUpdate)
-        self.graphicsView.setRubberBandSelectionMode(Qt.ContainsItemBoundingRect)
+        self.graphicsView.setFrameShape(QFrame.Shape.NoFrame)
+        self.graphicsView.setFrameShadow(QFrame.Shadow.Raised)
+        self.graphicsView.setRenderHints(QPainter.RenderHint.Antialiasing|QPainter.RenderHint.TextAntialiasing)
+        self.graphicsView.setDragMode(QGraphicsView.DragMode.RubberBandDrag)
+        self.graphicsView.setResizeAnchor(QGraphicsView.ViewportAnchor.AnchorUnderMouse)
+        self.graphicsView.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.FullViewportUpdate)
+        self.graphicsView.setRubberBandSelectionMode(Qt.ItemSelectionMode.ContainsItemBoundingRect)
 
         self.verticalLayout_2.addWidget(self.graphicsView)
 
diff --git a/spinetoolbox/ui/mainwindow.ui b/spinetoolbox/ui/mainwindow.ui
index 6ca3e2775..493f660bf 100644
--- a/spinetoolbox/ui/mainwindow.ui
+++ b/spinetoolbox/ui/mainwindow.ui
@@ -151,7 +151,7 @@
     </size>
    </property>
    <property name="features">
-    <set>QDockWidget::DockWidgetClosable|QDockWidget::DockWidgetFloatable|QDockWidget::DockWidgetMovable</set>
+    <set>QDockWidget::DockWidgetFeature::DockWidgetClosable|QDockWidget::DockWidgetFeature::DockWidgetFloatable|QDockWidget::DockWidgetFeature::DockWidgetMovable</set>
    </property>
    <property name="windowTitle">
     <string>Event Log</string>
@@ -196,7 +196,7 @@
           </sizepolicy>
          </property>
          <property name="contextMenuPolicy">
-          <enum>Qt::DefaultContextMenu</enum>
+          <enum>Qt::ContextMenuPolicy::DefaultContextMenu</enum>
          </property>
          <property name="openLinks">
           <bool>false</bool>
@@ -213,10 +213,10 @@
            <normaloff>:/icons/check-circle.svg</normaloff>:/icons/check-circle.svg</iconset>
          </property>
          <property name="popupMode">
-          <enum>QToolButton::InstantPopup</enum>
+          <enum>QToolButton::ToolButtonPopupMode::InstantPopup</enum>
          </property>
          <property name="toolButtonStyle">
-          <enum>Qt::ToolButtonTextBesideIcon</enum>
+          <enum>Qt::ToolButtonStyle::ToolButtonTextBesideIcon</enum>
          </property>
         </widget>
        </item>
@@ -255,7 +255,7 @@
      <item>
       <widget class="QSplitter" name="splitter_console">
        <property name="orientation">
-        <enum>Qt::Vertical</enum>
+        <enum>Qt::Orientation::Vertical</enum>
        </property>
        <property name="childrenCollapsible">
         <bool>false</bool>
@@ -275,13 +275,13 @@
        </widget>
        <widget class="QLabel" name="label_no_console">
         <property name="contextMenuPolicy">
-         <enum>Qt::DefaultContextMenu</enum>
+         <enum>Qt::ContextMenuPolicy::DefaultContextMenu</enum>
         </property>
         <property name="text">
          <string>Select an executing item to see its console</string>
         </property>
         <property name="alignment">
-         <set>Qt::AlignCenter</set>
+         <set>Qt::AlignmentFlag::AlignCenter</set>
         </property>
         <property name="wordWrap">
          <bool>true</bool>
@@ -294,7 +294,7 @@
   </widget>
   <widget class="QDockWidget" name="dockWidget_design_view">
    <property name="features">
-    <set>QDockWidget::DockWidgetMovable</set>
+    <set>QDockWidget::DockWidgetFeature::DockWidgetMovable</set>
    </property>
    <property name="windowTitle">
     <string>Design View</string>
@@ -322,25 +322,25 @@
      <item>
       <widget class="DesignQGraphicsView" name="graphicsView">
        <property name="frameShape">
-        <enum>QFrame::NoFrame</enum>
+        <enum>QFrame::Shape::NoFrame</enum>
        </property>
        <property name="frameShadow">
-        <enum>QFrame::Raised</enum>
+        <enum>QFrame::Shadow::Raised</enum>
        </property>
        <property name="renderHints">
-        <set>QPainter::Antialiasing|QPainter::TextAntialiasing</set>
+        <set>QPainter::RenderHint::Antialiasing|QPainter::RenderHint::TextAntialiasing</set>
        </property>
        <property name="dragMode">
-        <enum>QGraphicsView::RubberBandDrag</enum>
+        <enum>QGraphicsView::DragMode::RubberBandDrag</enum>
        </property>
        <property name="resizeAnchor">
-        <enum>QGraphicsView::AnchorUnderMouse</enum>
+        <enum>QGraphicsView::ViewportAnchor::AnchorUnderMouse</enum>
        </property>
        <property name="viewportUpdateMode">
-        <enum>QGraphicsView::FullViewportUpdate</enum>
+        <enum>QGraphicsView::ViewportUpdateMode::FullViewportUpdate</enum>
        </property>
        <property name="rubberBandSelectionMode">
-        <enum>Qt::ContainsItemBoundingRect</enum>
+        <enum>Qt::ItemSelectionMode::ContainsItemBoundingRect</enum>
        </property>
       </widget>
      </item>
diff --git a/tests/widgets/test_AddProjectItemWidget.py b/tests/widgets/test_AddProjectItemWidget.py
index 782dc14f5..4894d7356 100644
--- a/tests/widgets/test_AddProjectItemWidget.py
+++ b/tests/widgets/test_AddProjectItemWidget.py
@@ -19,6 +19,7 @@
 from spinetoolbox.project_item.project_item import ProjectItem
 from spinetoolbox.project_item.project_item_factory import ProjectItemFactory
 from spinetoolbox.widgets.add_project_item_widget import AddProjectItemWidget
+from spinetoolbox.widgets.properties_widget import PropertiesWidgetBase
 from tests.mock_helpers import TestCaseWithQApplication, clean_up_toolbox, create_toolboxui_with_project
 
 
@@ -125,7 +126,7 @@ def make_properties_widget(toolbox):
         Returns:
             QWidget: item's properties tab widget
         """
-        return MagicMock()
+        return PropertiesWidgetBase(toolbox)
 
     @staticmethod
     def make_specification_menu(parent, index):