diff --git a/applets/kicker/plugin/runnermodel.cpp b/applets/kicker/plugin/runnermodel.cpp
--- a/applets/kicker/plugin/runnermodel.cpp
+++ b/applets/kicker/plugin/runnermodel.cpp
@@ -167,8 +167,16 @@
 
 void RunnerModel::setRunners(const QStringList &runners)
 {
-    if (m_runners.toSet() != runners.toSet()) {
-        m_runners = runners;
+    QStringList newRunners = runners;
+    newRunners.removeDuplicates();
+    newRunners.sort();
+
+    QStringList currRunners = m_runners;
+    currRunners.removeDuplicates();
+    currRunners.sort();
+
+    if (currRunners != newRunners) {
+        m_runners = newRunners;
 
         if (m_runnerManager) {
             m_runnerManager->setAllowedRunners(runners);
diff --git a/dataengines/systemmonitor/systemmonitor.cpp b/dataengines/systemmonitor/systemmonitor.cpp
--- a/dataengines/systemmonitor/systemmonitor.cpp
+++ b/dataengines/systemmonitor/systemmonitor.cpp
@@ -50,7 +50,11 @@
 
 QStringList SystemMonitorEngine::sources() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     return m_sensors.toList();
+#else
+    return QList<QString>(m_sensors.begin(), m_sensors.end());
+#endif
 }
 
 bool SystemMonitorEngine::sourceRequestEvent(const QString &name)
diff --git a/kcms/translations/translationsmodel.cpp b/kcms/translations/translationsmodel.cpp
--- a/kcms/translations/translationsmodel.cpp
+++ b/kcms/translations/translationsmodel.cpp
@@ -274,7 +274,11 @@
 {
     beginResetModel();
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     m_availableLanguages = (m_installedLanguages - QSet<QString>::fromList(languages)).values();
+#else
+    m_availableLanguages = (m_installedLanguages - QSet<QString>(languages.begin(), languages.end())).values();
+#endif
 
     QCollator c;
     c.setCaseSensitivity(Qt::CaseInsensitive);
diff --git a/libtaskmanager/launchertasksmodel.cpp b/libtaskmanager/launchertasksmodel.cpp
--- a/libtaskmanager/launchertasksmodel.cpp
+++ b/libtaskmanager/launchertasksmodel.cpp
@@ -148,7 +148,11 @@
         return false;
     }
 
-    const auto activities = ActivitiesSet::fromList(_activities);
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    const QSet<QString> activities = ActivitiesSet::fromList(_activities);
+#else
+    const QSet<QString> activities = QSet<QString>(_activities.begin(), _activities.end());
+#endif
 
     if (url.isLocalFile() && KDesktopFile::isDesktopFile(url.toLocalFile())) {
         KDesktopFile f(url.toLocalFile());
@@ -404,7 +408,11 @@
         std::tie(url, _activities) =
             deserializeLauncher(serializedLauncher);
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
         auto activities = ActivitiesSet::fromList(_activities);
+#else
+        auto activities = ActivitiesSet(_activities.begin(), _activities.end());
+#endif
 
         // Is url is not valid, ignore it
         if (!isValidLauncherUrl(url)) {
diff --git a/libtaskmanager/taskgroupingproxymodel.cpp b/libtaskmanager/taskgroupingproxymodel.cpp
--- a/libtaskmanager/taskgroupingproxymodel.cpp
+++ b/libtaskmanager/taskgroupingproxymodel.cpp
@@ -851,7 +851,11 @@
 
 void TaskGroupingProxyModel::setBlacklistedAppIds(const QStringList &list)
 {
-    const QSet<QString> &set = QSet<QString>::fromList(list);
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    const QSet<QString> set = QSet<QString>::fromList(list);
+#else
+    const QSet<QString> set = QSet<QString>(list.begin(), list.end());
+#endif
 
     if (d->blacklistedAppIds != set) {
         d->blacklistedAppIds = set;
@@ -882,7 +886,11 @@
 
 void TaskGroupingProxyModel::setBlacklistedLauncherUrls(const QStringList &list)
 {
-    const QSet<QString> &set = QSet<QString>::fromList(list);
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    const QSet<QString> set = QSet<QString>::fromList(list);
+#else
+    const QSet<QString> set = QSet<QString>(list.begin(), list.end());
+#endif
 
     if (d->blacklistedLauncherUrls != set) {
         d->blacklistedLauncherUrls = set;
diff --git a/wallpapers/image/backgroundlistmodel.cpp b/wallpapers/image/backgroundlistmodel.cpp
--- a/wallpapers/image/backgroundlistmodel.cpp
+++ b/wallpapers/image/backgroundlistmodel.cpp
@@ -137,7 +137,12 @@
     connect(finder, &BackgroundFinder::backgroundsFound, this, &BackgroundListModel::backgroundsFound);
     m_findToken = finder->token();
     finder->start();
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     m_removableWallpapers = QSet<QString>::fromList(selected);
+#else
+    m_removableWallpapers = QSet<QString>(selected.begin(), selected.end());
+#endif
 }
 
 void BackgroundListModel::backgroundsFound(const QStringList &paths, const QString &token)