diff --git a/krusader/GUI/krhistorycombobox.cpp b/krusader/GUI/krhistorycombobox.cpp
--- a/krusader/GUI/krhistorycombobox.cpp
+++ b/krusader/GUI/krhistorycombobox.cpp
@@ -48,9 +48,9 @@
 bool KHBoxEventFilter::eventFilter(QObject *obj, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
-        auto keyEvent = dynamic_cast<QKeyEvent *>(event);
+        auto keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->modifiers() == Qt::ShiftModifier && keyEvent->key() == Qt::Key::Key_Delete) {
-            auto comboBox = dynamic_cast<KHistoryComboBox *>(obj);
+            auto comboBox = qobject_cast<KHistoryComboBox *>(obj);
             if (comboBox != nullptr) {
                 QString entryToDelete = comboBox->currentText();
                 // Delete the current item
@@ -83,16 +83,16 @@
 bool KHBoxListEventFilter::eventFilter(QObject *obj, QEvent *event)
 {
     if (event->type() == QEvent::KeyPress) {
-        auto keyEvent = dynamic_cast<QKeyEvent *>(event);
+        auto keyEvent = static_cast<QKeyEvent *>(event);
         if (keyEvent->modifiers() == Qt::ShiftModifier && keyEvent->key() == Qt::Key::Key_Delete) {
-            auto itemView = dynamic_cast<QAbstractItemView *>(obj);
+            auto itemView = qobject_cast<QAbstractItemView *>(obj);
             if (itemView->model() != nullptr) {
                 QString entryToDelete = itemView->currentIndex().data().toString();
                 // Delete the current item from the popup list
                 itemView->model()->removeRow(itemView->currentIndex().row());
                 // The item has to be deleted also from the completion list of the KHistoryComboBox
                 if (itemView->parent() != nullptr) {
-                    auto comboBox = dynamic_cast<KHistoryComboBox *>(itemView->parent()->parent());
+                    auto comboBox = qobject_cast<KHistoryComboBox *>(itemView->parent()->parent());
                     if (comboBox != nullptr) {
                         comboBox->completionObject()->removeItem(entryToDelete);
                         return true;
diff --git a/krusader/KViewer/lister.cpp b/krusader/KViewer/lister.cpp
--- a/krusader/KViewer/lister.cpp
+++ b/krusader/KViewer/lister.cpp
@@ -1360,7 +1360,7 @@
         connect(downloadJob, &KIO::TransferJob::result, this, [=](KJob *job) {
             _tempFile->flush();
             if (job->error()) {   /* any error occurred? */
-                auto *kioJob = dynamic_cast<KIO::TransferJob *>(job);
+                auto *kioJob = qobject_cast<KIO::TransferJob *>(job);
                 KMessageBox::error(_textArea, i18n("Error reading file %1.", kioJob->url().toDisplayString(QUrl::PreferLocalFile)));
             }
             _downloading = false;
diff --git a/krusader/Konfigurator/kgdependencies.cpp b/krusader/Konfigurator/kgdependencies.cpp
--- a/krusader/Konfigurator/kgdependencies.cpp
+++ b/krusader/Konfigurator/kgdependencies.cpp
@@ -145,7 +145,7 @@
 
 void KgDependencies::slotApply(QObject *obj, const QString& configGroup, const QString& name)
 {
-    auto *urlRequester = dynamic_cast<KonfiguratorURLRequester *>( obj);
+    auto *urlRequester = qobject_cast<KonfiguratorURLRequester *>( obj);
 
     KConfigGroup group(krConfig, configGroup);
     group.writeEntry(name, urlRequester->url().toDisplayString(QUrl::PreferLocalFile));
diff --git a/krusader/Konfigurator/kggeneral.cpp b/krusader/Konfigurator/kggeneral.cpp
--- a/krusader/Konfigurator/kggeneral.cpp
+++ b/krusader/Konfigurator/kggeneral.cpp
@@ -287,7 +287,7 @@
 
 void KgGeneral::applyTempDir(QObject *obj, const QString& configGroup, const QString& name)
 {
-    auto *urlReq = dynamic_cast<KonfiguratorURLRequester *>(obj);
+    auto *urlReq = qobject_cast<KonfiguratorURLRequester *>(obj);
     QString value = urlReq->url().toDisplayString(QUrl::PreferLocalFile);
 
     KConfigGroup(krConfig, configGroup).writeEntry(name, value);
diff --git a/krusader/Konfigurator/konfigurator.cpp b/krusader/Konfigurator/konfigurator.cpp
--- a/krusader/Konfigurator/konfigurator.cpp
+++ b/krusader/Konfigurator/konfigurator.cpp
@@ -163,7 +163,7 @@
 void Konfigurator::slotApplyEnable()
 {
     lastPage = currentPage();
-    bool isChanged = (dynamic_cast<KonfiguratorPage *>(lastPage->widget()))->isChanged();
+    bool isChanged = (qobject_cast<KonfiguratorPage *>(lastPage->widget()))->isChanged();
     button(QDialogButtonBox::Apply)->setEnabled(isChanged);
     button(QDialogButtonBox::Reset)->setEnabled(isChanged);
 }
@@ -173,7 +173,7 @@
     if (before == nullptr)
         return true;
 
-    auto *currentPg = dynamic_cast<KonfiguratorPage *>(before->widget());
+    auto *currentPg = qobject_cast<KonfiguratorPage *>(before->widget());
 
     if (internalCall) {
         internalCall = false;
@@ -221,17 +221,17 @@
 
 void Konfigurator::slotApply()
 {
-    emit configChanged((dynamic_cast<KonfiguratorPage*>(currentPage()->widget()))->apply());
+    emit configChanged((qobject_cast<KonfiguratorPage*>(currentPage()->widget()))->apply());
 }
 
 void Konfigurator::slotReset()
 {
-    (dynamic_cast<KonfiguratorPage *>(currentPage()->widget()))->loadInitialValues();
+    (qobject_cast<KonfiguratorPage *>(currentPage()->widget()))->loadInitialValues();
 }
 
 void Konfigurator::slotRestoreDefaults()
 {
-    (dynamic_cast<KonfiguratorPage *>(currentPage()->widget()))->setDefaults();
+    (qobject_cast<KonfiguratorPage *>(currentPage()->widget()))->setDefaults();
 }
 
 void Konfigurator::slotShowHelp()
diff --git a/krusader/Panel/krsearchbar.cpp b/krusader/Panel/krsearchbar.cpp
--- a/krusader/Panel/krsearchbar.cpp
+++ b/krusader/Panel/krsearchbar.cpp
@@ -222,7 +222,7 @@
 
     qDebug() << "key press event=" << event;
 
-    auto *ke = dynamic_cast<QKeyEvent *>(event);
+    auto *ke = static_cast<QKeyEvent *>(event);
     auto modifiers = ke->modifiers();
 
     if (watched == _view->widget()) {
diff --git a/krusader/Synchronizer/synchronizer.cpp b/krusader/Synchronizer/synchronizer.cpp
--- a/krusader/Synchronizer/synchronizer.cpp
+++ b/krusader/Synchronizer/synchronizer.cpp
@@ -179,7 +179,7 @@
 
             if (entry->inherits("CompareTask")) {
                 if (entry->state() == ST_STATE_READY) {
-                    auto *ctentry = dynamic_cast<CompareTask *>( entry);
+                    auto *ctentry = qobject_cast<CompareTask *>( entry);
                     if (ctentry->isDuplicate())
                         compareDirectory(ctentry->parent(), ctentry->leftDirList(), ctentry->rightDirList(),
                                          ctentry->leftDir(), ctentry->rightDir());
diff --git a/krusader/Synchronizer/synchronizertask.cpp b/krusader/Synchronizer/synchronizertask.cpp
--- a/krusader/Synchronizer/synchronizertask.cpp
+++ b/krusader/Synchronizer/synchronizertask.cpp
@@ -272,8 +272,8 @@
         if (compareArray.size())
             abortContentComparing();
     } else {
-        if (!(dynamic_cast<KIO::TransferJob *>(job))->isSuspended()) {
-            (dynamic_cast<KIO::TransferJob *>(job))->suspend();
+        if (!(qobject_cast<KIO::TransferJob *>(job))->isSuspended()) {
+            (qobject_cast<KIO::TransferJob *>(job))->suspend();
             otherJob->resume();
         }
     }
diff --git a/krusader/actionsbase.cpp b/krusader/actionsbase.cpp
--- a/krusader/actionsbase.cpp
+++ b/krusader/actionsbase.cpp
@@ -98,13 +98,13 @@
 KToggleAction *ActionsBase::toggleAction(QString text, QString icon, const QKeySequence& shortcut,
                                 QObject *recv, const char *slot, QString name)
 {
-    return dynamic_cast<KToggleAction *>(action(std::move(text), std::move(icon), shortcut, recv, slot, std::move(name), true));
+    return qobject_cast<KToggleAction *>(action(std::move(text), std::move(icon), shortcut, recv, slot, std::move(name), true));
 }
 
 KToggleAction *ActionsBase::toggleAction(QString text, QString icon, const QKeySequence& shortcut,
                                          ActionGroup &group, const char *slot, QString name)
 {
-    return dynamic_cast<KToggleAction *>(action(std::move(text), std::move(icon), shortcut, group, slot, std::move(name), true));
+    return qobject_cast<KToggleAction *>(action(std::move(text), std::move(icon), shortcut, group, slot, std::move(name), true));
 }
 
 QAction *ActionsBase::stdAction(KStandardAction::StandardAction id, QObject *recv, const char *slot)
diff --git a/krusader/krusader.cpp b/krusader/krusader.cpp
--- a/krusader/krusader.cpp
+++ b/krusader/krusader.cpp
@@ -544,7 +544,7 @@
 }
 
 void Krusader::updateUserActions() {
-    auto *userActionMenu = dynamic_cast<KActionMenu *>( KrActions::actUserMenu);
+    auto *userActionMenu = qobject_cast<KActionMenu *>( KrActions::actUserMenu);
     if (userActionMenu) {
         userActionMenu->menu()->clear();