diff --git a/qt/aqt/browser.py b/qt/aqt/browser.py
index a40c2064f..33469bc45 100644
--- a/qt/aqt/browser.py
+++ b/qt/aqt/browser.py
@@ -9,7 +9,7 @@ import time
 from dataclasses import dataclass
 from enum import Enum
 from operator import itemgetter
-from typing import Callable, List, Optional, Sequence, Tuple, Union
+from typing import Callable, List, Optional, Sequence, Tuple, Union, cast
 
 import anki
 import aqt
@@ -27,6 +27,7 @@ from aqt import AnkiQt, gui_hooks
 from aqt.editor import Editor
 from aqt.exporting import ExportDialog
 from aqt.previewer import BrowserPreviewer as PreviewDialog
+from aqt.previewer import Previewer
 from aqt.qt import *
 from aqt.theme import theme_manager
 from aqt.utils import (
@@ -103,7 +104,7 @@ class DataModel(QAbstractTableModel):
                 del self.cardObjs[c.id]
                 refresh = True
         if refresh:
-            self.layoutChanged.emit()
+            self.layoutChanged.emit()  # type: ignore
 
     # Model interface
     ######################################################################
@@ -130,12 +131,12 @@ class DataModel(QAbstractTableModel):
             if not t.get("bfont"):
                 return
             f = QFont()
-            f.setFamily(t.get("bfont", "arial"))
-            f.setPixelSize(t.get("bsize", 12))
+            f.setFamily(cast(str, t.get("bfont", "arial")))
+            f.setPixelSize(cast(int, t.get("bsize", 12)))
             return f
 
         elif role == Qt.TextAlignmentRole:
-            align = Qt.AlignVCenter
+            align: Union[Qt.AlignmentFlag, int] = Qt.AlignVCenter
             if self.activeCols[index.column()] not in (
                 "question",
                 "answer",
@@ -299,7 +300,7 @@ class DataModel(QAbstractTableModel):
         elif type == "template":
             t = c.template()["name"]
             if c.model()["type"] == MODEL_CLOZE:
-                t += " %d" % (c.ord + 1)
+                t = f"{t} {c.ord + 1}"
             return t
         elif type == "cardDue":
             # catch invalid dates
@@ -308,7 +309,7 @@ class DataModel(QAbstractTableModel):
             except:
                 t = ""
             if c.queue < 0:
-                t = "(" + t + ")"
+                t = f"({t})"
             return t
         elif type == "noteCrt":
             return time.strftime(self.time_format(), time.localtime(c.note().id / 1000))
@@ -582,8 +583,8 @@ class Browser(QMainWindow):
         self.mw = mw
         self.col = self.mw.col
         self.lastFilter = ""
-        self.focusTo = None
-        self._previewer = None
+        self.focusTo: Optional[int] = None
+        self._previewer: Optional[Previewer] = None
         self._closeEventHasCleanedUp = False
         self.form = aqt.forms.browser.Ui_Dialog()
         self.form.setupUi(self)
@@ -2017,7 +2018,7 @@ update cards set usn=?, mod=?, did=? where id in """
         nids = set()
         for s, nidlist in res:
             nids.update(nidlist)
-        self.col.tags.bulkAdd(nids, _("duplicate"))
+        self.col.tags.bulkAdd(list(nids), _("duplicate"))
         self.mw.progress.finish()
         self.model.endReset()
         self.mw.requireReset()
@@ -2225,16 +2226,16 @@ class ChangeModel(QDialog):
             old = self.oldModel["tmpls"]
             combos = self.tcombos
             new = self.targetModel["tmpls"]
-        map = {}
+        template_map: Dict[int, Optional[int]] = {}
         for i, f in enumerate(old):
             idx = combos[i].currentIndex()
             if idx == len(new):
                 # ignore
-                map[f["ord"]] = None
+                template_map[f["ord"]] = None
             else:
                 f2 = new[idx]
-                map[f["ord"]] = f2["ord"]
-        return map
+                template_map[f["ord"]] = f2["ord"]
+        return template_map
 
     def getFieldMap(self):
         return self.getTemplateMap(
diff --git a/qt/aqt/taglimit.py b/qt/aqt/taglimit.py
index 0cb164683..971c41f49 100644
--- a/qt/aqt/taglimit.py
+++ b/qt/aqt/taglimit.py
@@ -1,5 +1,6 @@
 # Copyright: Ankitects Pty Ltd and contributors
 # License: GNU AGPL, version 3 or later; http://www.gnu.org/copyleft/agpl.html
+from typing import List, Optional
 
 import aqt
 from aqt.qt import *
@@ -9,8 +10,9 @@ from aqt.utils import restoreGeom, saveGeom
 class TagLimit(QDialog):
     def __init__(self, mw, parent):
         QDialog.__init__(self, parent, Qt.Window)
+        self.tags: Union[str, List] = ""
         self.mw = mw
-        self.parent = parent
+        self.parent: Optional[QWidget] = parent
         self.deck = self.parent.deck
         self.dialog = aqt.forms.taglimit.Ui_Dialog()
         self.dialog.setupUi(self)
diff --git a/qt/aqt/update.py b/qt/aqt/update.py
index 5d3bbda0b..8b179f65f 100644
--- a/qt/aqt/update.py
+++ b/qt/aqt/update.py
@@ -47,18 +47,18 @@ class LatestVersionFinder(QThread):
             print("update check failed")
             return
         if resp["msg"]:
-            self.newMsg.emit(resp)
+            self.newMsg.emit(resp)  # type: ignore
         if resp["ver"]:
-            self.newVerAvail.emit(resp["ver"])
+            self.newVerAvail.emit(resp["ver"])  # type: ignore
         diff = resp["time"] - time.time()
         if abs(diff) > 300:
-            self.clockIsOff.emit(diff)
+            self.clockIsOff.emit(diff)  # type: ignore
 
 
 def askAndUpdate(mw, ver):
     baseStr = _("""<h1>Anki Updated</h1>Anki %s has been released.<br><br>""") % ver
     msg = QMessageBox(mw)
-    msg.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
+    msg.setStandardButtons(QMessageBox.Yes | QMessageBox.No)  # type: ignore
     msg.setIcon(QMessageBox.Information)
     msg.setText(baseStr + _("Would you like to download it now?"))
     button = QPushButton(_("Ignore this update"))
diff --git a/qt/mypy.ini b/qt/mypy.ini
index 69352e25e..4d4b6a50a 100644
--- a/qt/mypy.ini
+++ b/qt/mypy.ini
@@ -76,3 +76,9 @@ check_untyped_defs=true
 check_untyped_defs=true
 [mypy-aqt.deckconf]
 check_untyped_defs=true
+[mypy-aqt.taglimit]
+check_untyped_defs=true
+[mypy-aqt.update]
+check_untyped_defs=true
+[mypy-aqt.browser]
+check_untyped_defs=true