diff --git a/cartridges/application.py b/cartridges/application.py
index 2a2558e..4689737 100644
--- a/cartridges/application.py
+++ b/cartridges/application.py
@@ -13,7 +13,7 @@ from .ui.window import Window
 class Application(Adw.Application):
     """The main application."""
 
-    def __init__(self) -> None:
+    def __init__(self):
         super().__init__(application_id=APP_ID)
 
         self.add_action_entries((
@@ -23,11 +23,11 @@ class Application(Adw.Application):
         self.set_accels_for_action("app.quit", ("<Control>q",))
 
     @override
-    def do_activate(self) -> None:
+    def do_activate(self):
         window = self.props.active_window or Window(application=self)
         window.present()
 
-    def _present_about_dialog(self) -> None:
+    def _present_about_dialog(self):
         dialog = Adw.AboutDialog.new_from_appdata(f"{PREFIX}/{APP_ID}.metainfo.xml")
         # Translators: Replace "translator-credits" with your name/username,
         # and optionally a URL or an email in <user@example.org> format.
diff --git a/cartridges/ui/window.py b/cartridges/ui/window.py
index f89f70d..1058c4e 100644
--- a/cartridges/ui/window.py
+++ b/cartridges/ui/window.py
@@ -42,7 +42,7 @@ class Window(Adw.ApplicationWindow):
         """Model of the user's games."""
         return games.model
 
-    def __init__(self, **kwargs: Any) -> None:
+    def __init__(self, **kwargs: Any):
         super().__init__(**kwargs)
 
         if PROFILE == "development":
@@ -59,20 +59,20 @@ class Window(Adw.ApplicationWindow):
         ))
 
     @Gtk.Template.Callback()
-    def _search_started(self, entry: Gtk.SearchEntry) -> None:
+    def _search_started(self, entry: Gtk.SearchEntry):
         entry.grab_focus()
 
     @Gtk.Template.Callback()
-    def _search_changed(self, entry: Gtk.SearchEntry) -> None:
+    def _search_changed(self, entry: Gtk.SearchEntry):
         self.search_text = entry.props.text
         entry.grab_focus()
 
     @Gtk.Template.Callback()
-    def _stop_search(self, entry: Gtk.SearchEntry) -> None:
+    def _stop_search(self, entry: Gtk.SearchEntry):
         entry.props.text = ""
         self.grid.grab_focus()
 
-    def _sort(self, action: Gio.SimpleAction, parameter: GLib.Variant, *_args) -> None:
+    def _sort(self, action: Gio.SimpleAction, parameter: GLib.Variant, *_args):
         action.change_state(parameter)
         prop, invert = SORT_MODES[parameter.get_string()]
         opposite = (self._sort_prop == prop) and (self._invert_sort != invert)