diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index d490b1cfbf..0bbfcf6b97 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -287,7 +287,17 @@ class CuraApplication(QtApplication):
             "RotateTool",
             "ScaleTool",
             "SelectionTool",
-            "TranslateTool"
+            "TranslateTool",
+
+            # Version upgrades:
+            "VersionUpgrade21to22",
+            "VersionUpgrade22to24",
+            "VersionUpgrade25to26",
+            "VersionUpgrade26to27",
+            "VersionUpgrade27to30",
+            "VersionUpgrade30to31",
+            "VersionUpgrade32to33",
+            "VersionUpgrade33to34",
         ])
         self._physics = None
         self._volume = None