diff --git a/cura/CameraAnimation.py b/cura/CameraAnimation.py
index 32086c8ba2..699655a31e 100644
--- a/cura/CameraAnimation.py
+++ b/cura/CameraAnimation.py
@@ -13,7 +13,7 @@ class CameraAnimation(QVariantAnimation):
         super().__init__(parent)
         self._camera_tool = None
         self.setDuration(300)
-        self.setEasingCurve(QEasingCurve.OutQuad)
+        self.setEasingCurve(QEasingCurve.Type.OutQuad)
 
     def setCameraTool(self, camera_tool):
         self._camera_tool = camera_tool
diff --git a/cura/CrashHandler.py b/cura/CrashHandler.py
index 563755f6d4..f5ce13e04b 100644
--- a/cura/CrashHandler.py
+++ b/cura/CrashHandler.py
@@ -161,7 +161,7 @@ class CrashHandler:
         QDesktopServices.openUrl(QUrl.fromLocalFile( path ))
 
     def _showDetailedReport(self):
-        self.dialog.exec_()
+        self.dialog.exec()
 
     def _createDialog(self):
         """Creates a modal dialog."""
@@ -449,5 +449,5 @@ class CrashHandler:
     def _show(self):
         # When the exception is in the skip_exception_types list, the dialog is not created, so we don't need to show it
         if self.dialog:
-            self.dialog.exec_()
+            self.dialog.exec()
         os._exit(1)
diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index fe39c2a992..c2b67b8fbb 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -870,7 +870,7 @@ class CuraApplication(QtApplication):
         self._auto_save = AutoSave(self)
         self._auto_save.initialize()
 
-        self.exec_()
+        self.exec()
 
     def __setUpSingleInstanceServer(self):
         if self._use_single_instance:
diff --git a/cura/PrintJobPreviewImageProvider.py b/cura/PrintJobPreviewImageProvider.py
index 528f42fb4d..90c115a4b4 100644
--- a/cura/PrintJobPreviewImageProvider.py
+++ b/cura/PrintJobPreviewImageProvider.py
@@ -8,7 +8,7 @@ from typing import Tuple
 
 class PrintJobPreviewImageProvider(QQuickImageProvider):
     def __init__(self):
-        super().__init__(QQuickImageProvider.Image)
+        super().__init__(QQuickImageProvider.ImageType.Image)
 
     def requestImage(self, id: str, size: QSize) -> Tuple[QImage, QSize]:
         """Request a new image.
diff --git a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
index 3325a18d78..dae24767db 100644
--- a/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
+++ b/cura/PrinterOutput/NetworkedPrinterOutputDevice.py
@@ -146,8 +146,8 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
         url = QUrl("http://" + self._address + self._api_prefix + target)
         request = QNetworkRequest(url)
         if content_type is not None:
-            request.setHeader(QNetworkRequest.ContentTypeHeader, content_type)
-        request.setHeader(QNetworkRequest.UserAgentHeader, self._user_agent)
+            request.setHeader(QNetworkRequest.KnownHeaders.ContentTypeHeader, content_type)
+        request.setHeader(QNetworkRequest.KnownHeaders.UserAgentHeader, self._user_agent)
         return request
 
     def createFormPart(self, content_header: str, data: bytes, content_type: Optional[str] = None) -> QHttpPart:
@@ -162,10 +162,10 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
 
         if not content_header.startswith("form-data;"):
             content_header = "form-data; " + content_header
-        part.setHeader(QNetworkRequest.ContentDispositionHeader, content_header)
+        part.setHeader(QNetworkRequest.KnownHeaders.ContentDispositionHeader, content_header)
 
         if content_type is not None:
-            part.setHeader(QNetworkRequest.ContentTypeHeader, content_type)
+            part.setHeader(QNetworkRequest.KnownHeaders.ContentTypeHeader, content_type)
 
         part.setBody(data)
         return part
@@ -311,7 +311,7 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
 
     def postForm(self, target: str, header_data: str, body_data: bytes, on_finished: Optional[Callable[[QNetworkReply], None]], on_progress: Callable = None) -> None:
         post_part = QHttpPart()
-        post_part.setHeader(QNetworkRequest.ContentDispositionHeader, header_data)
+        post_part.setHeader(QNetworkRequest.KnownHeaders.ContentDispositionHeader, header_data)
         post_part.setBody(body_data)
 
         self.postFormWithParts(target, [post_part], on_finished, on_progress)
@@ -357,10 +357,10 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
     def _handleOnFinished(self, reply: QNetworkReply) -> None:
         # Due to garbage collection, we need to cache certain bits of post operations.
         # As we don't want to keep them around forever, delete them if we get a reply.
-        if reply.operation() == QNetworkAccessManager.PostOperation:
+        if reply.operation() == QNetworkAccessManager.Operation.PostOperation:
             self._clearCachedMultiPart(reply)
 
-        if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) is None:
+        if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) is None:
             # No status code means it never even reached remote.
             return
 
diff --git a/cura_app.py b/cura_app.py
index 2374197b59..da8b3bc18d 100755
--- a/cura_app.py
+++ b/cura_app.py
@@ -148,10 +148,10 @@ def exceptHook(hook_type, value, traceback):
     # The flag "CuraApplication.Created" is set to True when CuraApplication finishes its constructor call.
     #
     # Before the "started" flag is set to True, the Qt event loop has not started yet. The event loop is a blocking
-    # call to the QApplication.exec_(). In this case, we need to:
+    # call to the QApplication.exec(). In this case, we need to:
     #   1. Remove all scheduled events so no more unnecessary events will be processed, such as loading the main dialog,
     #      loading the machine, etc.
-    #   2. Start the Qt event loop with exec_() and show the Crash Dialog.
+    #   2. Start the Qt event loop with exec() and show the Crash Dialog.
     #
     # If the application has finished its initialization and was running fine, and then something causes a crash,
     # we run the old routine to show the Crash Dialog.
@@ -164,7 +164,7 @@ def exceptHook(hook_type, value, traceback):
         if not has_started:
             CuraApplication.getInstance().removePostedEvents(None)
             _crash_handler.early_crash_dialog.show()
-            sys.exit(CuraApplication.getInstance().exec_())
+            sys.exit(CuraApplication.getInstance().exec())
         else:
             _crash_handler.show()
     else:
diff --git a/plugins/CuraDrive/src/RestoreBackupJob.py b/plugins/CuraDrive/src/RestoreBackupJob.py
index 6f20693de9..54c94b389e 100644
--- a/plugins/CuraDrive/src/RestoreBackupJob.py
+++ b/plugins/CuraDrive/src/RestoreBackupJob.py
@@ -53,7 +53,7 @@ class RestoreBackupJob(Job):
     def _onRestoreRequestCompleted(self, reply: QNetworkReply, error: Optional["QNetworkReply.NetworkError"] = None) -> None:
         if not HttpRequestManager.replyIndicatesSuccess(reply, error):
             Logger.warning("Requesting backup failed, response code %s while trying to connect to %s",
-                           reply.attribute(QNetworkRequest.HttpStatusCodeAttribute), reply.url())
+                           reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute), reply.url())
             self.restore_backup_error_message = self.DEFAULT_ERROR_MESSAGE
             self._job_done.set()
             return
diff --git a/plugins/DigitalLibrary/src/DFFileUploader.py b/plugins/DigitalLibrary/src/DFFileUploader.py
index f206c736cc..6cad7828e2 100644
--- a/plugins/DigitalLibrary/src/DFFileUploader.py
+++ b/plugins/DigitalLibrary/src/DFFileUploader.py
@@ -120,9 +120,9 @@ class DFFileUploader:
         """
 
         Logger.log("i", "Finished callback %s %s",
-                   reply.attribute(QNetworkRequest.HttpStatusCodeAttribute), reply.url().toString())
+                   reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute), reply.url().toString())
 
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)  # type: Optional[int]
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)  # type: Optional[int]
         if not status_code:
             Logger.log("e", "Reply contained no status code.")
             self._onUploadError(reply, None)
diff --git a/plugins/DigitalLibrary/src/DigitalFactoryApiClient.py b/plugins/DigitalLibrary/src/DigitalFactoryApiClient.py
index 9654bf3373..3456638ba6 100644
--- a/plugins/DigitalLibrary/src/DigitalFactoryApiClient.py
+++ b/plugins/DigitalLibrary/src/DigitalFactoryApiClient.py
@@ -228,7 +228,7 @@ class DigitalFactoryApiClient:
             self._anti_gc_callbacks.remove(parse)
 
             # Don't try to parse the reply if we didn't get one
-            if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) is None:
+            if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) is None:
                 if on_error is not None:
                     on_error()
                 return
@@ -250,7 +250,7 @@ class DigitalFactoryApiClient:
         :return: A tuple with a status code and a dictionary.
         """
 
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         try:
             response = bytes(reply.readAll()).decode()
             return status_code, json.loads(response)
diff --git a/plugins/SliceInfoPlugin/SliceInfo.py b/plugins/SliceInfoPlugin/SliceInfo.py
index bd0bd96baa..0bf76f8423 100755
--- a/plugins/SliceInfoPlugin/SliceInfo.py
+++ b/plugins/SliceInfoPlugin/SliceInfo.py
@@ -289,7 +289,7 @@ class SliceInfo(QObject, Extension):
             Logger.logException("e", "Exception raised while sending slice info.") # But we should be notified about these problems of course.
 
     def _onRequestFinished(self, reply: "QNetworkReply") -> None:
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         if status_code == 200:
             Logger.log("i", "SliceInfo sent successfully")
             return
diff --git a/plugins/Toolbox/src/CloudSync/CloudPackageChecker.py b/plugins/Toolbox/src/CloudSync/CloudPackageChecker.py
index 7a6a04d88c..9f6f48efa4 100644
--- a/plugins/Toolbox/src/CloudSync/CloudPackageChecker.py
+++ b/plugins/Toolbox/src/CloudSync/CloudPackageChecker.py
@@ -70,10 +70,10 @@ class CloudPackageChecker(QObject):
                                                       scope = self._scope)
 
     def _onUserPackagesRequestFinished(self, reply: "QNetworkReply", error: Optional["QNetworkReply.NetworkError"] = None) -> None:
-        if error is not None or reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) != 200:
+        if error is not None or reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) != 200:
             Logger.log("w",
                        "Requesting user packages failed, response code %s while trying to connect to %s",
-                       reply.attribute(QNetworkRequest.HttpStatusCodeAttribute), reply.url())
+                       reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute), reply.url())
             self._application.getCuraAPI().account.setSyncState(self.SYNC_SERVICE_NAME, SyncState.ERROR)
             return
 
diff --git a/plugins/Toolbox/src/Toolbox.py b/plugins/Toolbox/src/Toolbox.py
index 4fdd70726a..44b62b64af 100644
--- a/plugins/Toolbox/src/Toolbox.py
+++ b/plugins/Toolbox/src/Toolbox.py
@@ -589,11 +589,11 @@ class Toolbox(QObject, Extension):
         self.setViewPage("errored")
 
     def _onDataRequestFinished(self, request_type: str, reply: "QNetworkReply") -> None:
-        if reply.operation() != QNetworkAccessManager.GetOperation:
+        if reply.operation() != QNetworkAccessManager.Operation.GetOperation:
             Logger.log("e", "_onDataRequestFinished() only handles GET requests but got [%s] instead", reply.operation())
             return
 
-        http_status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        http_status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         if http_status_code != 200:
             Logger.log("e", "Request type [%s] got non-200 HTTP response: [%s]", http_status_code)
             self.setViewPage("errored")
@@ -650,7 +650,7 @@ class Toolbox(QObject, Extension):
     def _onDownloadFinished(self, reply: "QNetworkReply") -> None:
         self.resetDownload()
 
-        if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) != 200:
+        if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) != 200:
             try:
                 reply_error = json.loads(reply.readAll().data().decode("utf-8"))
             except Exception as e:
diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudApiClient.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudApiClient.py
index 971f6786c0..470e57947e 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudApiClient.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudApiClient.py
@@ -165,7 +165,7 @@ class CloudApiClient:
 
         request = QNetworkRequest(QUrl(path))
         if content_type:
-            request.setHeader(QNetworkRequest.ContentTypeHeader, content_type)
+            request.setHeader(QNetworkRequest.KnownHeaders.ContentTypeHeader, content_type)
         access_token = self._account.accessToken
         if access_token:
             request.setRawHeader(b"Authorization", "Bearer {}".format(access_token).encode())
@@ -179,7 +179,7 @@ class CloudApiClient:
         :return: A tuple with a status code and a dictionary.
         """
 
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         try:
             response = bytes(reply.readAll()).decode()
             return status_code, json.loads(response)
@@ -233,7 +233,7 @@ class CloudApiClient:
             self._anti_gc_callbacks.remove(parse)
 
             # Don't try to parse the reply if we didn't get one
-            if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) is None:
+            if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) is None:
                 if on_error is not None:
                     on_error()
                 return
diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
index 50028b9614..8c45ce537f 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
@@ -272,7 +272,7 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         """
         Displays a message when an error occurs specific to uploading print job (i.e. queue is full).
         """
-        error_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        error_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         if error_code == 409:
             PrintJobUploadQueueFullMessage().show()
         else:
diff --git a/plugins/UM3NetworkPrinting/src/Cloud/ToolPathUploader.py b/plugins/UM3NetworkPrinting/src/Cloud/ToolPathUploader.py
index 54a0a27332..1881d90923 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/ToolPathUploader.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/ToolPathUploader.py
@@ -106,9 +106,9 @@ class ToolPathUploader:
         """Checks whether a chunk of data was uploaded successfully, starting the next chunk if needed."""
 
         Logger.log("i", "Finished callback %s %s",
-                   reply.attribute(QNetworkRequest.HttpStatusCodeAttribute), reply.url().toString())
+                   reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute), reply.url().toString())
 
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)  # type: Optional[int]
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)  # type: Optional[int]
         if not status_code:
             Logger.log("e", "Reply contained no status code.")
             self._errorCallback(reply, None)
diff --git a/plugins/UM3NetworkPrinting/src/Models/UM3PrintJobOutputModel.py b/plugins/UM3NetworkPrinting/src/Models/UM3PrintJobOutputModel.py
index 45d6431acd..85651244f9 100644
--- a/plugins/UM3NetworkPrinting/src/Models/UM3PrintJobOutputModel.py
+++ b/plugins/UM3NetworkPrinting/src/Models/UM3PrintJobOutputModel.py
@@ -42,6 +42,6 @@ class UM3PrintJobOutputModel(PrintJobOutputModel):
     def _onImageLoaded(self, reply: QNetworkReply, error: Optional["QNetworkReply.NetworkError"] = None) -> None:
         if not HttpRequestManager.replyIndicatesSuccess(reply, error):
             Logger.warning("Requesting preview image failed, response code {0} while trying to connect to {1}".format(
-                           reply.attribute(QNetworkRequest.HttpStatusCodeAttribute), reply.url()))
+                           reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute), reply.url()))
             return
         self.updatePreviewImageData(reply.readAll())
diff --git a/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py b/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
index a562a59384..b3df000f7b 100644
--- a/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
+++ b/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
@@ -118,9 +118,9 @@ class ClusterApiClient:
         """
         url = QUrl("http://" + self._address + path)
         request = QNetworkRequest(url)
-        request.setAttribute(QNetworkRequest.FollowRedirectsAttribute, True)
+        request.setAttribute(QNetworkRequest.Attribute.RedirectPolicyAttribute, QNetworkRequest.RedirectPolicy.ManualRedirectPolicy)
         if content_type:
-            request.setHeader(QNetworkRequest.ContentTypeHeader, content_type)
+            request.setHeader(QNetworkRequest.KnownHeaders.ContentTypeHeader, content_type)
         return request
 
     @staticmethod
@@ -130,7 +130,7 @@ class ClusterApiClient:
         :param reply: The reply from the server.
         :return: A tuple with a status code and a dictionary.
         """
-        status_code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
+        status_code = reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute)
         try:
             response = bytes(reply.readAll()).decode()
             return status_code, json.loads(response)
@@ -173,7 +173,7 @@ class ClusterApiClient:
             self._anti_gc_callbacks.remove(parse)
 
             # Don't try to parse the reply if we didn't get one
-            if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) is None:
+            if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) is None:
                 return
 
             if reply.error() > 0:
diff --git a/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py b/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
index dae7942604..32e20892ac 100644
--- a/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
+++ b/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
@@ -152,7 +152,7 @@ class SendMaterialJob(Job):
     def _sendingFinished(self, reply: QNetworkReply) -> None:
         """Check a reply from an upload to the printer and log an error when the call failed"""
 
-        if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) != 200:
+        if reply.attribute(QNetworkRequest.Attribute.HttpStatusCodeAttribute) != 200:
             Logger.log("w", "Error while syncing material: %s", reply.errorString())
             return
         body = reply.readAll().data().decode('utf8')
diff --git a/tests/PrinterOutput/TestNetworkedPrinterOutputDevice.py b/tests/PrinterOutput/TestNetworkedPrinterOutputDevice.py
index 9d91f83576..984051d589 100644
--- a/tests/PrinterOutput/TestNetworkedPrinterOutputDevice.py
+++ b/tests/PrinterOutput/TestNetworkedPrinterOutputDevice.py
@@ -43,7 +43,7 @@ def test_post():
 
     # Create a fake reply (we can't use a QReply, since those are abstract C++)
     reply = MagicMock()
-    reply.operation = MagicMock(return_value=QNetworkAccessManager.PostOperation)
+    reply.operation = MagicMock(return_value=QNetworkAccessManager.Operation.PostOperation)
     reply.url = MagicMock(return_value=QUrl("127.0.0.1"))
     mocked_network_manager.post = MagicMock(return_value = reply)
 
@@ -65,7 +65,7 @@ def test_get():
 
     # Create a fake reply (we can't use a QReply, since those are abstract C++)
     reply = MagicMock()
-    reply.operation = MagicMock(return_value=QNetworkAccessManager.PostOperation)
+    reply.operation = MagicMock(return_value=QNetworkAccessManager.Operation.PostOperation)
     reply.url = MagicMock(return_value=QUrl("127.0.0.1"))
     mocked_network_manager.get = MagicMock(return_value=reply)
 
@@ -87,7 +87,7 @@ def test_delete():
 
     # Create a fake reply (we can't use a QReply, since those are abstract C++)
     reply = MagicMock()
-    reply.operation = MagicMock(return_value=QNetworkAccessManager.PostOperation)
+    reply.operation = MagicMock(return_value=QNetworkAccessManager.Operation.PostOperation)
     reply.url = MagicMock(return_value=QUrl("127.0.0.1"))
     mocked_network_manager.deleteResource = MagicMock(return_value=reply)
 
@@ -109,7 +109,7 @@ def test_put():
 
     # Create a fake reply (we can't use a QReply, since those are abstract C++)
     reply = MagicMock()
-    reply.operation = MagicMock(return_value=QNetworkAccessManager.PostOperation)
+    reply.operation = MagicMock(return_value=QNetworkAccessManager.Operation.PostOperation)
     reply.url = MagicMock(return_value=QUrl("127.0.0.1"))
     mocked_network_manager.put = MagicMock(return_value = reply)