diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d63484b7..a810ba528 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,8 +38,8 @@ ecm_setup_version(${RELEASE_SERVICE_VERSION}
 )
 
 ecm_set_disabled_deprecation_versions(
-    QT 5.15
-    KF 5.110
+    QT 6.6
+    KF 6.0
 )
 
 # Make the version header available by linking against kdeconnectversion
diff --git a/app/qml/DevicePage.qml b/app/qml/DevicePage.qml
index 07747592a..fd1cefbdd 100644
--- a/app/qml/DevicePage.qml
+++ b/app/qml/DevicePage.qml
@@ -166,6 +166,10 @@ Kirigami.ScrollablePage {
             }
         }
 
+        QQC2.Button {
+            text: "banana"
+            Accessible.description: "Can you see me"
+        }
         Kirigami.PlaceholderMessage {
             // FIXME: not accessible. screen readers won't read this.
             //        https://invent.kde.org/frameworks/kirigami/-/merge_requests/1482
diff --git a/cli/kdeconnect-cli.cpp b/cli/kdeconnect-cli.cpp
index cdbeba026..68fa91a81 100644
--- a/cli/kdeconnect-cli.cpp
+++ b/cli/kdeconnect-cli.cpp
@@ -211,7 +211,7 @@ int main(int argc, char **argv)
             msg.setArguments(QVariantList{QVariant(urls)});
             blockOnReply(QDBusConnection::sessionBus().asyncCall(msg));
 
-            for (const QString &url : qAsConst(urls)) {
+            for (const QString &url : std::as_const(urls)) {
                 QTextStream(stdout) << i18n("Shared %1", url) << Qt::endl;
             }
         } else if (parser.isSet(QStringLiteral("share-text"))) {
diff --git a/core/backends/lan/mdns_wrapper.cpp b/core/backends/lan/mdns_wrapper.cpp
index 826c44a88..9c343a33c 100644
--- a/core/backends/lan/mdns_wrapper.cpp
+++ b/core/backends/lan/mdns_wrapper.cpp
@@ -173,7 +173,7 @@ void Discoverer::stopDiscovering()
 void Discoverer::stopListeningForQueryResponses()
 {
     qCDebug(KDECONNECT_CORE) << "Closing" << responseSocketNotifiers.size() << "sockets";
-    for (QSocketNotifier *socketNotifier : qAsConst(responseSocketNotifiers)) {
+    for (QSocketNotifier *socketNotifier : std::as_const(responseSocketNotifiers)) {
         mdns_socket_close(socketNotifier->socket());
         delete socketNotifier;
     }
@@ -247,7 +247,7 @@ void Discoverer::sendQuery(const QString &serviceType)
     query.type = MDNS_RECORDTYPE_PTR;
 
     static char buffer[2048];
-    for (QSocketNotifier *socketNotifier : qAsConst(responseSocketNotifiers)) {
+    for (QSocketNotifier *socketNotifier : std::as_const(responseSocketNotifiers)) {
         int socket = socketNotifier->socket();
         qCDebug(KDECONNECT_CORE) << "Sending mDNS query via socket" << socket;
         int ret = mdns_multiquery_send(socket, &query, 1, buffer, sizeof(buffer), 0);
diff --git a/core/daemon.cpp b/core/daemon.cpp
index fb6b3d3a7..d6a024bde 100644
--- a/core/daemon.cpp
+++ b/core/daemon.cpp
@@ -87,7 +87,7 @@ void Daemon::init()
     }
 
     // Listen to new devices
-    for (LinkProvider *a : qAsConst(d->m_linkProviders)) {
+    for (LinkProvider *a : std::as_const(d->m_linkProviders)) {
         connect(a, &LinkProvider::onConnectionReceived, this, &Daemon::onNewDeviceLink);
         a->onStart();
     }
@@ -108,14 +108,14 @@ void Daemon::removeDevice(Device *device)
 void Daemon::forceOnNetworkChange()
 {
     qCDebug(KDECONNECT_CORE) << "Sending onNetworkChange to" << d->m_linkProviders.size() << "LinkProviders";
-    for (LinkProvider *a : qAsConst(d->m_linkProviders)) {
+    for (LinkProvider *a : std::as_const(d->m_linkProviders)) {
         a->onNetworkChange();
     }
 }
 
 Device *Daemon::getDevice(const QString &deviceId)
 {
-    for (Device *device : qAsConst(d->m_devices)) {
+    for (Device *device : std::as_const(d->m_devices)) {
         if (device->id() == deviceId) {
             return device;
         }
@@ -131,7 +131,7 @@ QSet<LinkProvider *> Daemon::getLinkProviders() const
 QStringList Daemon::devices(bool onlyReachable, bool onlyTrusted) const
 {
     QStringList ret;
-    for (Device *device : qAsConst(d->m_devices)) {
+    for (Device *device : std::as_const(d->m_devices)) {
         if (onlyReachable && !device->isReachable())
             continue;
         if (onlyTrusted && !device->isPaired())
@@ -144,7 +144,7 @@ QStringList Daemon::devices(bool onlyReachable, bool onlyTrusted) const
 QMap<QString, QString> Daemon::deviceNames(bool onlyReachable, bool onlyTrusted) const
 {
     QMap<QString, QString> ret;
-    for (Device *device : qAsConst(d->m_devices)) {
+    for (Device *device : std::as_const(d->m_devices)) {
         if (onlyReachable && !device->isReachable())
             continue;
         if (onlyTrusted && !device->isPaired())
@@ -239,7 +239,7 @@ QList<Device *> Daemon::devicesList() const
 
 QString Daemon::deviceIdByName(const QString &name) const
 {
-    for (Device *device : qAsConst(d->m_devices)) {
+    for (Device *device : std::as_const(d->m_devices)) {
         if (device->name() == name && device->isPaired())
             return device->id();
     }
@@ -266,7 +266,7 @@ void Daemon::addDevice(Device *device)
 QStringList Daemon::pairingRequests() const
 {
     QStringList ret;
-    for (Device *dev : qAsConst(d->m_devices)) {
+    for (Device *dev : std::as_const(d->m_devices)) {
         if (dev->isPairRequestedByPeer())
             ret += dev->id();
     }
diff --git a/core/device.cpp b/core/device.cpp
index a45f2fa87..6b5edae2a 100644
--- a/core/device.cpp
+++ b/core/device.cpp
@@ -159,7 +159,7 @@ void Device::reloadPlugins()
 
         PluginLoader *loader = PluginLoader::instance();
 
-        for (const QString &pluginName : qAsConst(d->m_supportedPlugins)) {
+        for (const QString &pluginName : std::as_const(d->m_supportedPlugins)) {
             const KPluginMetaData service = loader->getPluginInfo(pluginName);
 
             const bool pluginEnabled = isPluginEnabled(pluginName);
@@ -194,7 +194,7 @@ void Device::reloadPlugins()
 
     // Recreate dbus paths for all plugins (new and existing)
     QDBusConnection bus = QDBusConnection::sessionBus();
-    for (KdeConnectPlugin *plugin : qAsConst(d->m_plugins)) {
+    for (KdeConnectPlugin *plugin : std::as_const(d->m_plugins)) {
         const QString dbusPath = plugin->dbusPath();
         if (!dbusPath.isEmpty()) {
             bus.registerObject(dbusPath,
@@ -343,7 +343,7 @@ bool Device::sendPacket(NetworkPacket &np)
     Q_ASSERT(isPaired() || np.type() == PACKET_TYPE_PAIR);
 
     // Maybe we could block here any packet that is not an identity or a pairing packet to prevent sending non encrypted data
-    for (DeviceLink *dl : qAsConst(d->m_deviceLinks)) {
+    for (DeviceLink *dl : std::as_const(d->m_deviceLinks)) {
         if (dl->sendPacket(np))
             return true;
     }
@@ -396,7 +396,7 @@ bool Device::isPairRequestedByPeer() const
 
 QHostAddress Device::getLocalIpAddress() const
 {
-    for (DeviceLink *dl : qAsConst(d->m_deviceLinks)) {
+    for (DeviceLink *dl : std::as_const(d->m_deviceLinks)) {
         LanDeviceLink *ldl = dynamic_cast<LanDeviceLink *>(dl);
         if (ldl) {
             return ldl->hostAddress();
diff --git a/declarativeplugin/responsewaiter.cpp b/declarativeplugin/responsewaiter.cpp
index 87750c53a..d81584489 100644
--- a/declarativeplugin/responsewaiter.cpp
+++ b/declarativeplugin/responsewaiter.cpp
@@ -106,8 +106,8 @@ void DBusAsyncResponse::onTimeout()
 
 const QDBusPendingCall *DBusResponseWaiter::extractPendingCall(QVariant &variant) const
 {
-    for (int type : qAsConst(m_registered)) {
-        if (variant.canConvert(QVariant::Type(type))) {
+    for (int type : std::as_const(m_registered)) {
+        if (variant.typeId() == type) {
             return reinterpret_cast<const QDBusPendingCall *>(variant.constData());
         }
     }
diff --git a/interfaces/notificationsmodel.cpp b/interfaces/notificationsmodel.cpp
index b74fead6f..b0b2616b1 100644
--- a/interfaces/notificationsmodel.cpp
+++ b/interfaces/notificationsmodel.cpp
@@ -204,7 +204,7 @@ int NotificationsModel::rowCount(const QModelIndex &parent) const
 
 bool NotificationsModel::isAnyDimissable() const
 {
-    for (NotificationDbusInterface *notification : qAsConst(m_notificationList)) {
+    for (NotificationDbusInterface *notification : std::as_const(m_notificationList)) {
         if (notification->dismissable()) {
             return true;
         }
@@ -214,7 +214,7 @@ bool NotificationsModel::isAnyDimissable() const
 
 void NotificationsModel::dismissAll()
 {
-    for (NotificationDbusInterface *notification : qAsConst(m_notificationList)) {
+    for (NotificationDbusInterface *notification : std::as_const(m_notificationList)) {
         if (notification->dismissable()) {
             notification->dismiss();
         }
diff --git a/kcm/kcm.cpp b/kcm/kcm.cpp
index 5e1cdd708..8698501ca 100644
--- a/kcm/kcm.cpp
+++ b/kcm/kcm.cpp
@@ -76,7 +76,7 @@ KdeConnectKcm::KdeConnectKcm(QObject *parent, const KPluginMetaData &md, const Q
     connect(kcmUi.renameShow_button, &QAbstractButton::clicked, this, &KdeConnectKcm::renameShow);
     connect(kcmUi.pluginSelector, &KPluginWidget::changed, this, &KdeConnectKcm::pluginsConfigChanged);
 
-    if (!args.isEmpty() && args.first().type() == QVariant::String) {
+    if (!args.isEmpty() && !args.first().isNull() && args.first().canConvert<QString>()) {
         const QString input = args.first().toString();
         const auto colonIdx = input.indexOf(QLatin1Char(':'));
         const QString deviceId = input.left(colonIdx);
diff --git a/plugins/findthisdevice/findthisdeviceplugin.cpp b/plugins/findthisdevice/findthisdeviceplugin.cpp
index 3e3ec9702..ddce10da1 100644
--- a/plugins/findthisdevice/findthisdeviceplugin.cpp
+++ b/plugins/findthisdevice/findthisdeviceplugin.cpp
@@ -51,8 +51,8 @@ void FindThisDevicePlugin::receivePacket(const NetworkPacket & /*np*/)
             mutedSinks.append(sink);
         }
     }
-    connect(player, &QMediaPlayer::stateChanged, this, [mutedSinks] {
-        for (auto sink : qAsConst(mutedSinks)) {
+    connect(player, &QMediaPlayer::playbackStateChanged, this, [mutedSinks] {
+        for (auto sink : std::as_const(mutedSinks)) {
             sink->setMuted(true);
         }
     });
diff --git a/plugins/pausemusic/pausemusicplugin.cpp b/plugins/pausemusic/pausemusicplugin.cpp
index 1488e7439..9b15109db 100644
--- a/plugins/pausemusic/pausemusicplugin.cpp
+++ b/plugins/pausemusic/pausemusicplugin.cpp
@@ -94,7 +94,7 @@ void PauseMusicPlugin::receivePacket(const NetworkPacket &np)
 
         if (pause && !pausedSources.empty()) {
             if (autoResume) {
-                for (const QString &iface : qAsConst(pausedSources)) {
+                for (const QString &iface : std::as_const(pausedSources)) {
                     OrgMprisMediaPlayer2PlayerInterface mprisInterface(iface, QStringLiteral("/org/mpris/MediaPlayer2"), QDBusConnection::sessionBus());
                     mprisInterface.Play();
                 }
diff --git a/plugins/sms/conversationsdbusinterface.cpp b/plugins/sms/conversationsdbusinterface.cpp
index 6533909fb..4a0ad5fb1 100644
--- a/plugins/sms/conversationsdbusinterface.cpp
+++ b/plugins/sms/conversationsdbusinterface.cpp
@@ -120,7 +120,7 @@ void ConversationsDbusInterface::addMessages(const QList<ConversationMessage> &m
         m_known_messages[threadId].insert(message.uID());
 
         // If this message was inserted at the end of the list, it is the latest message in the conversation
-        bool latestMessage = threadPosition == m_conversations[threadId].end() - 1;
+        const bool latestMessage = std::distance(threadPosition, m_conversations[threadId].end()) == 1;
 
         // Tell the world about what just happened
         if (newConversation) {