diff --git a/CMakeLists.txt b/CMakeLists.txt
index c793ca083..04fc8ce8d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -106,7 +106,11 @@ set(QT_LIBRARIES
 if (UNIX AND NOT APPLE)
   list(APPEND QT_LIBRARIES DBus)
 endif()
-find_package(QT NAMES Qt6 Qt5 REQUIRED
+find_package(QT
+  NAMES
+    Qt6
+    Qt5
+  REQUIRED
   COMPONENTS
     ${QT_LIBRARIES}
   OPTIONAL_COMPONENTS
diff --git a/app/dialog/task/task.cpp b/app/dialog/task/task.cpp
index 2cc6fc063..aab2b2979 100644
--- a/app/dialog/task/task.cpp
+++ b/app/dialog/task/task.cpp
@@ -56,7 +56,13 @@ void TaskDialog::showEvent(QShowEvent *e)
             this, &TaskDialog::TaskFinished, Qt::QueuedConnection);
 
     // Run task in another thread with QtConcurrent
-    task_watcher->setFuture(QtConcurrent::run(&Task::Start, task_));
+    task_watcher->setFuture(
+#if QT_VERSION_MAJOR >= 6
+          QtConcurrent::run(&Task::Start, task_)
+#else
+          QtConcurrent::run(task_, &Task::Start)
+#endif
+          );
 
     already_shown_ = true;
   }
diff --git a/app/task/taskmanager.cpp b/app/task/taskmanager.cpp
index d961a7b5a..5d2be1036 100644
--- a/app/task/taskmanager.cpp
+++ b/app/task/taskmanager.cpp
@@ -93,7 +93,13 @@ void TaskManager::AddTask(Task* t)
   tasks_.insert(watcher, t);
 
   // Run task concurrently
-  watcher->setFuture(QtConcurrent::run(&Task::Start, t));
+  watcher->setFuture(
+#if QT_VERSION_MAJOR >= 6
+        QtConcurrent::run(&Task::Start, t)
+#else
+        QtConcurrent::run(t, &Task::Start)
+#endif
+        );
 
   // Emit signal that a Task was added
   emit TaskAdded(t);
diff --git a/app/widget/handmovableview/handmovableview.cpp b/app/widget/handmovableview/handmovableview.cpp
index 231a75a65..d7b748195 100644
--- a/app/widget/handmovableview/handmovableview.cpp
+++ b/app/widget/handmovableview/handmovableview.cpp
@@ -61,7 +61,7 @@ bool HandMovableView::HandPress(QMouseEvent *event)
 
     // Transform mouse event to act like the left button is pressed
     QMouseEvent transformed(event->type(),
-                            event->localPos(),
+                            event->pos(),
                             Qt::LeftButton,
                             Qt::LeftButton,
                             event->modifiers());
@@ -83,15 +83,15 @@ bool HandMovableView::HandMove(QMouseEvent *event)
     QPoint adjustment(0, 0);
 
     QMouseEvent transformed(event->type(),
-                            event->localPos() - transformed_pos_,
+                            event->pos() - transformed_pos_,
                             Qt::LeftButton,
                             Qt::LeftButton,
                             event->modifiers());
 
-    if (event->localPos().x() < 0) {
+    if (event->pos().x() < 0) {
       transformed_pos_.setX(transformed_pos_.x() + width());
       adjustment.setX(width());
-    } else if (event->localPos().x() >= width()) {
+    } else if (event->pos().x() >= width()) {
       transformed_pos_.setX(transformed_pos_.x() - width());
       adjustment.setX(-width());
     }
@@ -118,14 +118,13 @@ bool HandMovableView::HandRelease(QMouseEvent *event)
   if (dragging_hand_) {
     // Transform mouse event to act like the left button is pressed
     QMouseEvent transformed(event->type(),
-                            event->position(),
-                            event->scenePosition(),
-                            event->globalPosition(),
+                            event->localPos(),
+                            event->windowPos(),
+                            event->screenPos(),
                             Qt::LeftButton,
                             Qt::LeftButton,
                             event->modifiers(),
-                            event->source(),
-                            event->pointingDevice());
+                            event->source());
 
     super::mouseReleaseEvent(&transformed);
 
diff --git a/app/widget/viewer/viewerdisplay.cpp b/app/widget/viewer/viewerdisplay.cpp
index fcbc6553d..cd75d91e2 100644
--- a/app/widget/viewer/viewerdisplay.cpp
+++ b/app/widget/viewer/viewerdisplay.cpp
@@ -1129,11 +1129,12 @@ void ViewerDisplayWidget::ForwardDragEventToTextEdit(T *e)
   if constexpr (std::is_same_v<T, QDragLeaveEvent>) {
     text_edit_->dragLeaveEvent(e);
   } else {
-    T relay(AdjustPosByVAlign(GetVirtualPosForTextEdit(e->position())).toPoint(),
+
+    T relay(AdjustPosByVAlign(GetVirtualPosForTextEdit(e->pos())).toPoint(),
             e->possibleActions(),
             e->mimeData(),
-            e->buttons(),
-            e->modifiers());
+            e->mouseButtons(),
+            e->keyboardModifiers());
 
     if (e->type() == QEvent::DragEnter) {
       text_edit_->dragEnterEvent(static_cast<QDragEnterEvent*>(&relay));
@@ -1152,7 +1153,7 @@ void ViewerDisplayWidget::ForwardDragEventToTextEdit(T *e)
 bool ViewerDisplayWidget::ForwardMouseEventToTextEdit(QMouseEvent *event, bool check_if_outside)
 {
   // Transform screen mouse coords to world mouse coords
-  QPointF local_pos = GetVirtualPosForTextEdit(event->position());
+  QPointF local_pos = GetVirtualPosForTextEdit(event->pos());
 
   if (check_if_outside) {
     if (local_pos.x() < 0 || local_pos.x() >= text_edit_->width() || local_pos.y() < 0 || local_pos.y() >= text_edit_->height()) {
@@ -1163,7 +1164,7 @@ bool ViewerDisplayWidget::ForwardMouseEventToTextEdit(QMouseEvent *event, bool c
 
   local_pos = AdjustPosByVAlign(local_pos);
 
-  QMouseEvent derived(event->type(), local_pos, event->scenePosition(), event->globalPosition(), event->button(), event->buttons(), event->modifiers(), event->source(), event->pointingDevice());
+  QMouseEvent derived(event->type(), local_pos, event->windowPos(), event->screenPos(), event->button(), event->buttons(), event->modifiers(), event->source());
   return ForwardEventToTextEdit(&derived);
 }
 
diff --git a/app/widget/viewer/viewertexteditor.cpp b/app/widget/viewer/viewertexteditor.cpp
index 8dcbdf6bc..7c8c27fad 100644
--- a/app/widget/viewer/viewertexteditor.cpp
+++ b/app/widget/viewer/viewertexteditor.cpp
@@ -160,7 +160,7 @@ void ViewerTextEditor::UpdateToolBar(ViewerTextEditorToolBar *toolbar, const QTe
   }
 
   QString style = f.fontStyleName().toString();
-  QStringList styles = QFontDatabase::styles(family);
+  QStringList styles = QFontDatabase().styles(family);
   if (!styles.isEmpty() && (style.isEmpty() || !styles.contains(style))) {
     // There seems to be no better way to find the "regular" style outside of this heuristic.
     // Feel free to add more if a font isn't working right.
@@ -267,8 +267,8 @@ void ViewerTextEditor::ApplyStyle(QTextCharFormat *format, const QString &family
 {
   // NOTE: Windows appears to require setting weight and italic manually, while macOS and Linux are
   //       perfectly fine with just the style name
-  format->setFontWeight(QFontDatabase::weight(family, style));
-  format->setFontItalic(QFontDatabase::italic(family, style));
+  format->setFontWeight(QFontDatabase().weight(family, style));
+  format->setFontItalic(QFontDatabase().italic(family, style));
 
   format->setFontStyleName(style);
 }
@@ -536,7 +536,7 @@ void ViewerTextEditorToolBar::UpdateFontStyleList(const QString &family)
 
   style_combo_->blockSignals(true);
   style_combo_->clear();
-  QStringList l = QFontDatabase::styles(family);
+  QStringList l = QFontDatabase().styles(family);
   foreach (const QString &style, l) {
     style_combo_->addItem(style);
   }