diff --git a/cura/API/Interface/__init__.py b/cura/API/Interface/__init__.py
index 742254a1a4..cec174bf0a 100644
--- a/cura/API/Interface/__init__.py
+++ b/cura/API/Interface/__init__.py
@@ -3,7 +3,6 @@
 
 from typing import TYPE_CHECKING
 
-from UM.PluginRegistry import PluginRegistry
 from cura.API.Interface.Settings import Settings
 
 if TYPE_CHECKING:
@@ -23,9 +22,6 @@ if TYPE_CHECKING:
 
 class Interface:
 
-    # For now we use the same API version to be consistent.
-    VERSION = PluginRegistry.APIVersion
-
     def __init__(self, application: "CuraApplication") -> None:
         # API methods specific to the settings portion of the UI
         self.settings = Settings(application)
diff --git a/cura/API/__init__.py b/cura/API/__init__.py
index ad07452c1a..b3e702263a 100644
--- a/cura/API/__init__.py
+++ b/cura/API/__init__.py
@@ -4,7 +4,6 @@ from typing import Optional, TYPE_CHECKING
 
 from PyQt5.QtCore import QObject, pyqtProperty
 
-from UM.PluginRegistry import PluginRegistry
 from cura.API.Backups import Backups
 from cura.API.Interface import Interface
 from cura.API.Account import Account
@@ -22,7 +21,6 @@ if TYPE_CHECKING:
 class CuraAPI(QObject):
 
     # For now we use the same API version to be consistent.
-    VERSION = PluginRegistry.APIVersion
     __instance = None  # type: "CuraAPI"
     _application = None  # type: CuraApplication
 
@@ -62,4 +60,4 @@ class CuraAPI(QObject):
 
     @property
     def interface(self) -> "Interface":
-        return self._interface
\ No newline at end of file
+        return self._interface
diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index fc9ba1ebf4..7f0e742a9f 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -133,7 +133,7 @@ except ImportError:
     CuraVersion = "master"  # [CodeStyle: Reflecting imported value]
     CuraBuildType = ""
     CuraDebugMode = False
-    CuraSDKVersion = ""
+    CuraSDKVersion = "5.0.0"
 
 
 class CuraApplication(QtApplication):
@@ -162,6 +162,7 @@ class CuraApplication(QtApplication):
     def __init__(self, *args, **kwargs):
         super().__init__(name = "cura",
                          version = CuraVersion,
+                         api_version = CuraSDKVersion,
                          buildtype = CuraBuildType,
                          is_debug_mode = CuraDebugMode,
                          tray_icon_name = "cura-icon-32.png",
diff --git a/plugins/Toolbox/src/Toolbox.py b/plugins/Toolbox/src/Toolbox.py
index 7db4e8bde0..2d9299fb5a 100644
--- a/plugins/Toolbox/src/Toolbox.py
+++ b/plugins/Toolbox/src/Toolbox.py
@@ -209,11 +209,11 @@ class Toolbox(QObject, Extension):
     # Get the packages version depending on Cura version settings.
     def _getSDKVersion(self) -> Union[int, str]:
         if not hasattr(cura, "CuraVersion"):
-            return self._plugin_registry.APIVersion.getMajor()
+            return self._application.getAPIVersion().getMajor()
         if not hasattr(cura.CuraVersion, "CuraSDKVersion"):  # type: ignore
-            return self._plugin_registry.APIVersion.getMajor()
+            return self._application.getAPIVersion().getMajor()
         if not cura.CuraVersion.CuraSDKVersion:  # type: ignore
-            return self._plugin_registry.APIVersion.getMajor()
+            return self._application.getAPIVersion().getMajor()
         return cura.CuraVersion.CuraSDKVersion  # type: ignore
 
     @pyqtSlot()