diff --git a/src/game.py b/src/game.py
index 484c492..24a9ef1 100644
--- a/src/game.py
+++ b/src/game.py
@@ -53,9 +53,9 @@ class game(Gtk.Box):  # pylint: disable=invalid-name
         self.hidden = data["hidden"]
         self.last_played = data["last_played"]
         self.name = data["name"]
-        self.developer = data["developer"] if "developer" in data.keys() else None
-        self.removed = "removed" in data.keys()
-        self.blacklisted = "blacklisted" in data.keys()
+        self.developer = data["developer"] if "developer" in data else None
+        self.removed = "removed" in data
+        self.blacklisted = "blacklisted" in data
 
         self.pixbuf = self.get_cover()
 
@@ -125,7 +125,7 @@ class game(Gtk.Box):  # pylint: disable=invalid-name
     def get_cover(self):
 
         # If the cover is already in memory, return
-        if self.game_id in self.parent_widget.pixbufs.keys():
+        if self.game_id in self.parent_widget.pixbufs:
             return self.parent_widget.pixbufs[self.game_id]
 
         # Create a new pixbuf
diff --git a/src/preferences.py b/src/preferences.py
index 8af5263..cb3c91c 100644
--- a/src/preferences.py
+++ b/src/preferences.py
@@ -285,7 +285,7 @@ class PreferencesWindow(Adw.PreferencesWindow):
     def undo_remove_all(self, _widget, _unused):
         for game_id in self.removed_games:
             data = get_games([game_id])[game_id]
-            if "removed" in data.keys():
+            if "removed" in data:
                 data.pop("removed")
                 save_game(data)
         self.parent_widget.update_games(self.removed_games)
@@ -294,7 +294,7 @@ class PreferencesWindow(Adw.PreferencesWindow):
 
     def remove_all_games(self, _widget):
         for game in get_games().values():
-            if not "removed" in game.keys():
+            if "removed" not in game:
                 self.removed_games.append(game["game_id"])
                 game["removed"] = True
                 save_game(game)
diff --git a/src/utils/importer.py b/src/utils/importer.py
index 4ca0a86..e3850b5 100644
--- a/src/utils/importer.py
+++ b/src/utils/importer.py
@@ -57,7 +57,7 @@ class Importer:
             self.games_no += 1
             save_game(values)
             self.parent_widget.update_games([values["game_id"]])
-            if "blacklisted" in values.keys():
+            if "blacklisted" in values:
                 self.games_no -= 1
 
         self.queue -= 1
diff --git a/src/window.py b/src/window.py
index 6e7cb3c..fb7021d 100644
--- a/src/window.py
+++ b/src/window.py
@@ -87,7 +87,7 @@ class CartridgesWindow(Adw.ApplicationWindow):
         )
         current_games = get_games()
         for current_game in current_games:
-            if "removed" in current_games[current_game].keys():
+            if "removed" in current_games[current_game]:
                 os.remove(
                     os.path.join(
                         os.getenv("XDG_DATA_HOME")
@@ -421,7 +421,7 @@ class CartridgesWindow(Adw.ApplicationWindow):
             except IndexError:
                 return
         data = get_games([game_id])[game_id]
-        data.pop("removed")
+        data.pop("removed", None)
         save_game(data)
         self.update_games([game_id])
         self.toasts[game_id].dismiss()