diff --git a/.mypy.ini b/.mypy.ini
index 93ed0aaad..6ba52ee64 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -74,6 +74,12 @@ strict_optional = True
 strict_optional = True
 [mypy-aqt.deckoptions]
 strict_optional = True
+[mypy-aqt.notetypechooser]
+strict_optional = True
+[mypy-aqt.stats]
+strict_optional = True
+[mypy-aqt.switch]
+strict_optional = True
 [mypy-anki.scheduler.base]
 strict_optional = True
 [mypy-anki._backend.rsbridge]
diff --git a/qt/aqt/notetypechooser.py b/qt/aqt/notetypechooser.py
index 395af193b..cb282109d 100644
--- a/qt/aqt/notetypechooser.py
+++ b/qt/aqt/notetypechooser.py
@@ -111,6 +111,7 @@ class NotetypeChooser(QHBoxLayout):
             if not ret.name:
                 return
             notetype = self.mw.col.models.by_name(ret.name)
+            assert notetype is not None
             if (id := notetype["id"]) != self._selected_notetype_id:
                 self.selected_notetype_id = id
 
@@ -146,7 +147,9 @@ class NotetypeChooser(QHBoxLayout):
                 func(self._selected_notetype_id)
 
     def selected_notetype_name(self) -> str:
-        return self.mw.col.models.get(self.selected_notetype_id)["name"]
+        selected_notetype = self.mw.col.models.get(self.selected_notetype_id)
+        assert selected_notetype is not None
+        return selected_notetype["name"]
 
     def _ensure_selected_notetype_valid(self) -> None:
         if not self.mw.col.models.get(self._selected_notetype_id):
diff --git a/qt/aqt/stats.py b/qt/aqt/stats.py
index 206205349..05caf97f2 100644
--- a/qt/aqt/stats.py
+++ b/qt/aqt/stats.py
@@ -61,9 +61,11 @@ class NewDeckStats(QDialog):
         b = f.buttonBox.addButton(
             tr.statistics_save_pdf(), QDialogButtonBox.ButtonRole.ActionRole
         )
+        assert b is not None
         qconnect(b.clicked, self.saveImage)
         b.setAutoDefault(False)
         b = f.buttonBox.button(QDialogButtonBox.StandardButton.Close)
+        assert b is not None
         b.setAutoDefault(False)
         maybeHideClose(self.form.buttonBox)
         addCloseShortcut(self)
@@ -78,7 +80,7 @@ class NewDeckStats(QDialog):
     def reject(self) -> None:
         self.deck_chooser.cleanup()
         self.form.web.cleanup()
-        self.form.web = None
+        self.form.web = None  # type: ignore
         saveGeom(self, self.name)
         aqt.dialogs.markClosed("NewDeckStats")
         QDialog.reject(self)
@@ -115,7 +117,9 @@ class NewDeckStats(QDialog):
         # unreadable. A simple fix for now is to scroll to the top of the
         # page first.
         def after_scroll(arg: Any) -> None:
-            self.form.web.page().printToPdf(path)
+            form_web_page = self.form.web.page()
+            assert form_web_page is not None
+            form_web_page.printToPdf(path)
             tooltip(tr.statistics_saved())
 
         self.form.web.evalWithCallback("window.scrollTo(0, 0);", after_scroll)
@@ -165,6 +169,7 @@ class DeckStats(QDialog):
         b = f.buttonBox.addButton(
             tr.statistics_save_pdf(), QDialogButtonBox.ButtonRole.ActionRole
         )
+        assert b is not None
         qconnect(b.clicked, self.saveImage)
         b.setAutoDefault(False)
         qconnect(f.groups.clicked, lambda: self.changeScope("deck"))
@@ -182,7 +187,7 @@ class DeckStats(QDialog):
 
     def reject(self) -> None:
         self.form.web.cleanup()
-        self.form.web = None
+        self.form.web = None  # type: ignore
         saveGeom(self, self.name)
         aqt.dialogs.markClosed("DeckStats")
         QDialog.reject(self)
@@ -208,7 +213,9 @@ class DeckStats(QDialog):
         path = self._imagePath()
         if not path:
             return
-        self.form.web.page().printToPdf(path)
+        form_web_page = self.form.web.page()
+        assert form_web_page is not None
+        form_web_page.printToPdf(path)
         tooltip(tr.statistics_saved())
 
     def changePeriod(self, n: int) -> None:
diff --git a/qt/aqt/switch.py b/qt/aqt/switch.py
index fb3c2da6c..214d20bc7 100644
--- a/qt/aqt/switch.py
+++ b/qt/aqt/switch.py
@@ -103,7 +103,7 @@ class Switch(QAbstractButton):
         self._position = self.end_position
         self.update()
 
-    def paintEvent(self, _event: QPaintEvent) -> None:
+    def paintEvent(self, _event: QPaintEvent | None) -> None:
         painter = QPainter(self)
         painter.setRenderHint(QPainter.RenderHint.Antialiasing, True)
         painter.setPen(Qt.PenStyle.NoPen)
@@ -162,12 +162,13 @@ class Switch(QAbstractButton):
             self._current_label_rectangle(), Qt.AlignmentFlag.AlignCenter, self.label
         )
 
-    def mouseReleaseEvent(self, event: QMouseEvent) -> None:
+    def mouseReleaseEvent(self, event: QMouseEvent | None) -> None:
         super().mouseReleaseEvent(event)
+        assert event is not None
         if event.button() == Qt.MouseButton.LeftButton:
             self._animate_toggle()
 
-    def enterEvent(self, event: QEnterEvent) -> None:
+    def enterEvent(self, event: QEnterEvent | None) -> None:
         self.setCursor(Qt.CursorShape.PointingHandCursor)
         super().enterEvent(event)