diff --git a/game/__init__.py b/game/__init__.py
index 250f4a35..59976db3 100644
--- a/game/__init__.py
+++ b/game/__init__.py
@@ -1,2 +1,3 @@
 from .game import Game
 from .version import VERSION
+from .migrator import Migrator
diff --git a/game/migrator.py b/game/migrator.py
new file mode 100644
index 00000000..186499fe
--- /dev/null
+++ b/game/migrator.py
@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from game.ato.packagewaypoints import PackageWaypoints
+from game.data.doctrine import MODERN_DOCTRINE, COLDWAR_DOCTRINE, WWII_DOCTRINE
+from game.utils import knots, feet, nautical_miles
+
+if TYPE_CHECKING:
+    from game import Game
+
+
+class Migrator:
+    def __init__(self, game: Game):
+        self.game = game
+        self._migrate_game()
+
+    def _migrate_game(self) -> None:
+        self._update_doctrine()
+        self._update_packagewaypoints()
+
+    def _update_doctrine(self) -> None:
+        doctrines = [
+            MODERN_DOCTRINE,
+            COLDWAR_DOCTRINE,
+            WWII_DOCTRINE,
+        ]
+        for c in self.game.coalitions:
+            if c.faction.doctrine.__dict__ in [d.__dict__ for d in doctrines]:
+                continue
+            found = False
+            for d in doctrines:
+                if c.faction.doctrine.rendezvous_altitude == d.rendezvous_altitude:
+                    c.faction.doctrine = d
+                    found = True
+                    break
+            if not found:
+                c.faction.doctrine = MODERN_DOCTRINE
+
+    def _update_packagewaypoints(self) -> None:
+        for c in self.game.coalitions:
+            for p in c.ato.packages:
+                if not hasattr(p.waypoints, "initial"):
+                    p.waypoints = PackageWaypoints.create(p, c)
diff --git a/qt_ui/windows/QLiberationWindow.py b/qt_ui/windows/QLiberationWindow.py
index 75d5e674..9766444f 100644
--- a/qt_ui/windows/QLiberationWindow.py
+++ b/qt_ui/windows/QLiberationWindow.py
@@ -19,7 +19,7 @@ from PySide2.QtWidgets import (
 )
 
 import qt_ui.uiconstants as CONST
-from game import Game, VERSION, persistency
+from game import Game, VERSION, persistency, Migrator
 from game.debriefing import Debriefing
 from game.game import TurnState
 from game.layout import LAYOUTS
@@ -108,6 +108,7 @@ class QLiberationWindow(QMainWindow):
                 try:
                     logging.info("Loading last saved game : " + str(last_save_file))
                     game = persistency.load_game(last_save_file)
+                    Migrator(game)
                     self.onGameGenerated(game)
                     self.updateWindowTitle(last_save_file if game else None)
                 except:
@@ -317,6 +318,7 @@ class QLiberationWindow(QMainWindow):
         )
         if file is not None and file[0] != "":
             game = persistency.load_game(file[0])
+            Migrator(game)
             GameUpdateSignal.get_instance().game_loaded.emit(game)
 
             self.updateWindowTitle(file[0])