diff --git a/dataengines/executable/executable.cpp b/dataengines/executable/executable.cpp
index 0fb2f2be6..395de15ba 100644
--- a/dataengines/executable/executable.cpp
+++ b/dataengines/executable/executable.cpp
@@ -44,7 +44,7 @@ void ExecutableContainer::exec()
     if (m_process->state() == QProcess::NotRunning) {
         m_process->start();
     } else {
-        qDebug() << "Process" << objectName() << "already running. Pid:" << m_process->pid();
+        qDebug() << "Process" << objectName() << "already running. Pid:" << m_process->processId();
     }
 }
 
diff --git a/kcms/cursortheme/kcmcursortheme.cpp b/kcms/cursortheme/kcmcursortheme.cpp
index 735c51ea9..66a88dbdb 100644
--- a/kcms/cursortheme/kcmcursortheme.cpp
+++ b/kcms/cursortheme/kcmcursortheme.cpp
@@ -56,8 +56,8 @@ CursorThemeConfig::CursorThemeConfig(QObject *parent, const QVariantList &args)
     m_preferredSize = cursorThemeSettings()->cursorSize();
     connect(cursorThemeSettings(), &CursorThemeSettings::cursorThemeChanged, this, &CursorThemeConfig::updateSizeComboBox);
     qmlRegisterType<PreviewWidget>("org.kde.private.kcm_cursortheme", 1, 0, "PreviewWidget");
-    qmlRegisterType<SortProxyModel>();
-    qmlRegisterType<CursorThemeSettings>();
+    qmlRegisterAnonymousType<SortProxyModel>("SortProxyModel",1);
+    qmlRegisterAnonymousType<CursorThemeSettings>("CursorThemeSettings",1);
     KAboutData *aboutData = new KAboutData(QStringLiteral("kcm_cursortheme"),
                                            i18n("Cursors"),
                                            QStringLiteral("1.0"),
diff --git a/kcms/cursortheme/plasma-apply-cursortheme.cpp b/kcms/cursortheme/plasma-apply-cursortheme.cpp
index ee53a6870..aa3c13e6e 100644
--- a/kcms/cursortheme/plasma-apply-cursortheme.cpp
+++ b/kcms/cursortheme/plasma-apply-cursortheme.cpp
@@ -59,7 +59,7 @@ int main(int argc, char **argv)
         }
 
         if (settings->cursorTheme() == requestedTheme) {
-            ts << i18n("The requested theme \"%1\" is already set as the theme for the current Plasma session.", requestedTheme) << endl;
+            ts << i18n("The requested theme \"%1\" is already set as the theme for the current Plasma session.", requestedTheme) << Qt::endl;
             // This is not an error condition, no reason to set an error code
         } else {
             auto results = model->findIndex(requestedTheme);
@@ -70,9 +70,9 @@ int main(int argc, char **argv)
                 settings->setCursorTheme(theme->name());
                 if (settings->save() && applyTheme(theme, theme->defaultCursorSize())) {
                     notifyKcmChange(GlobalChangeType::CursorChanged);
-                    ts << i18n("Successfully applied the mouse cursor theme %1 to your current Plasma session", theme->title()) << endl;
+                    ts << i18n("Successfully applied the mouse cursor theme %1 to your current Plasma session", theme->title()) << Qt::endl;
                 } else {
-                    ts << i18n("You have to restart the Plasma session for your newly applied mouse cursor theme to display correctly.") << endl;
+                    ts << i18n("You have to restart the Plasma session for your newly applied mouse cursor theme to display correctly.") << Qt::endl;
                     // A bit of an odd one, more a warning than an error, but this means we can forward it
                     errorCode = -1;
                 }
@@ -85,18 +85,18 @@ int main(int argc, char **argv)
                 ts << i18n("Could not find theme \"%1\". The theme should be one of the following options: %2",
                            requestedTheme,
                            availableThemes.join(QLatin1String{", "}))
-                   << endl;
+                   << Qt::endl;
                 errorCode = -1;
             }
         }
     } else if (parser->isSet(QStringLiteral("list-themes"))) {
-        ts << i18n("You have the following mouse cursor themes on your system:") << endl;
+        ts << i18n("You have the following mouse cursor themes on your system:") << Qt::endl;
         for (int i = 0; i < model->rowCount(); ++i) {
             const CursorTheme *theme = model->theme(model->index(i, 0));
             if (settings->cursorTheme() == theme->name()) {
-                ts << QString(" * %1 (%2 - current theme for this Plasma session)").arg(theme->title()).arg(theme->name()) << endl;
+                ts << QString(" * %1 (%2 - current theme for this Plasma session)").arg(theme->title()).arg(theme->name()) << Qt::endl;
             } else {
-                ts << QString(" * %1 (%2)").arg(theme->title()).arg(theme->name()) << endl;
+                ts << QString(" * %1 (%2)").arg(theme->title()).arg(theme->name()) << Qt::endl;
             }
         }
     } else {
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
index ffeacd9d6..ce6eb9459 100644
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -56,9 +56,9 @@ KFonts::KFonts(QObject *parent, const QVariantList &args)
     KAboutData *about = new KAboutData("kcm_fonts", i18n("Fonts"), "0.1", QString(), KAboutLicense::LGPL);
     about->addAuthor(i18n("Antonis Tsiapaliokas"), QString(), "antonis.tsiapaliokas@kde.org");
     setAboutData(about);
-    qmlRegisterType<QStandardItemModel>();
-    qmlRegisterType<FontsSettings>();
-    qmlRegisterType<FontsAASettings>();
+    qmlRegisterAnonymousType<QStandardItemModel>("QStandardItemModel",1);
+    qmlRegisterAnonymousType<FontsSettings>("FontsSettings",1);
+    qmlRegisterAnonymousType<FontsAASettings>("FontsAASettings",1);
 
     setButtons(Apply | Default | Help);
 
diff --git a/kcms/kfontinst/kcmfontinst/DuplicatesDialog.cpp b/kcms/kfontinst/kcmfontinst/DuplicatesDialog.cpp
index 4b7eaa637..1ee3da9eb 100644
--- a/kcms/kfontinst/kcmfontinst/DuplicatesDialog.cpp
+++ b/kcms/kfontinst/kcmfontinst/DuplicatesDialog.cpp
@@ -126,7 +126,7 @@ void CDuplicatesDialog::scanFinished()
                     details.append(*fit);
                     details.append("");
                     details.append(KFormat().formatByteSize(info.size()));
-                    details.append(QLocale().toString(info.created()));
+                    details.append(QLocale().toString(info.birthTime()));
                     if (info.isSymLink()) {
                         details.append(info.symLinkTarget());
                     }
diff --git a/kcms/kfontinst/kcmfontinst/FontList.cpp b/kcms/kfontinst/kcmfontinst/FontList.cpp
index 10fdf37c4..7522be1f6 100644
--- a/kcms/kfontinst/kcmfontinst/FontList.cpp
+++ b/kcms/kfontinst/kcmfontinst/FontList.cpp
@@ -1337,7 +1337,7 @@ void CFontListView::getFonts(CJobRunner::ItemList &urls, QStringList &fontNames,
                     CFamilyItem *fam = static_cast<CFamilyItem *>(realIndex.internalPointer());
 
                     for (int ch = 0; ch < fam->fontCount(); ++ch) {
-                        QModelIndex child(itsProxy->mapToSource(index.child(ch, 0)));
+                        QModelIndex child(itsProxy->mapToSource(index.model()->index(ch, 0, index)));
 
                         if (child.isValid() && (static_cast<CFontModelItem *>(child.internalPointer()))->isFont()) {
                             CFontItem *font = static_cast<CFontItem *>(child.internalPointer());
@@ -1804,7 +1804,7 @@ void CFontListView::startDrag(Qt::DropActions supportedActions)
         drag->setPixmap(pix);
         drag->setMimeData(data);
         drag->setHotSpot(hotspot);
-        drag->start(supportedActions);
+        drag->exec(supportedActions);
     }
 }
 
diff --git a/kcms/notifications/kcm.cpp b/kcms/notifications/kcm.cpp
index 8d4b0b6a9..0e5aec207 100644
--- a/kcms/notifications/kcm.cpp
+++ b/kcms/notifications/kcm.cpp
@@ -49,13 +49,13 @@ KCMNotifications::KCMNotifications(QObject *parent, const QVariantList &args)
     const char uri[] = "org.kde.private.kcms.notifications";
     qmlRegisterUncreatableType<SourcesModel>(uri, 1, 0, "SourcesModel", QStringLiteral("Cannot create instances of SourcesModel"));
 
-    qmlRegisterType<FilterProxyModel>();
-    qmlRegisterType<QKeySequence>();
-    qmlRegisterType<NotificationManager::DoNotDisturbSettings>();
-    qmlRegisterType<NotificationManager::NotificationSettings>();
-    qmlRegisterType<NotificationManager::JobSettings>();
-    qmlRegisterType<NotificationManager::BadgeSettings>();
-    qmlRegisterType<NotificationManager::BehaviorSettings>();
+    qmlRegisterAnonymousType<FilterProxyModel>("FilterProxyModel",1);
+    qmlRegisterAnonymousType<QKeySequence>("QKeySequence",1);
+    qmlRegisterAnonymousType<NotificationManager::DoNotDisturbSettings>("DoNotDisturbSettings",1);
+    qmlRegisterAnonymousType<NotificationManager::NotificationSettings>("NotificationSettings",1);
+    qmlRegisterAnonymousType<NotificationManager::JobSettings>("JobSettings",1);
+    qmlRegisterAnonymousType<NotificationManager::BadgeSettings>("BadgeSettings",1);
+    qmlRegisterAnonymousType<NotificationManager::BehaviorSettings>("BehaviorSettings",1);
     qmlProtectModule(uri, 1);
 
     KAboutData *about = new KAboutData(QStringLiteral("kcm_notifications"), i18n("Notifications"), QStringLiteral("5.0"), QString(), KAboutLicense::GPL);
diff --git a/ksmserver/client.cpp b/ksmserver/client.cpp
index 988b70119..ec2ed0bb1 100644
--- a/ksmserver/client.cpp
+++ b/ksmserver/client.cpp
@@ -24,7 +24,7 @@
 #endif
 #include <time.h>
 
-#include <krandom.h>
+#include <QRandomGenerator>
 
 extern KSMServer *the_server;
 
@@ -79,7 +79,7 @@ char *safeSmsGenerateClientID(SmsConn /*c*/)
                (1 would be IP, 2 would be DEC-NET format) */
             char hostname[256];
             if (gethostname(hostname, 255) != 0)
-                *my_addr = QStringLiteral("0%1").arg(KRandom::random(), 8, 16);
+                *my_addr = QStringLiteral("0%1").arg(QRandomGenerator::global()->generate(), 8, 16);
             else {
                 // create some kind of hash for the hostname
                 int addr[4] = {0, 0, 0, 0};
diff --git a/shell/containmentconfigview.cpp b/shell/containmentconfigview.cpp
index 473d6eaa0..b3c9d920e 100644
--- a/shell/containmentconfigview.cpp
+++ b/shell/containmentconfigview.cpp
@@ -42,7 +42,7 @@ ContainmentConfigView::ContainmentConfigView(Plasma::Containment *cont, QWindow
     : ConfigView(cont, parent)
     , m_containment(cont)
 {
-    qmlRegisterType<QAbstractItemModel>();
+    qmlRegisterAnonymousType<QAbstractItemModel>("QAbstractItemModel",1);
     rootContext()->setContextProperty(QStringLiteral("configDialog"), this);
     setCurrentWallpaper(cont->containment()->wallpaper());
 
diff --git a/wallpapers/image/imageplugin.cpp b/wallpapers/image/imageplugin.cpp
index 2cfe4db8a..57731d22e 100644
--- a/wallpapers/image/imageplugin.cpp
+++ b/wallpapers/image/imageplugin.cpp
@@ -13,5 +13,5 @@ void ImagePlugin::registerTypes(const char *uri)
     Q_ASSERT(uri == QLatin1String("org.kde.plasma.wallpapers.image"));
 
     qmlRegisterType<Image>(uri, 2, 0, "Image");
-    qmlRegisterType<QAbstractItemModel>();
+    qmlRegisterAnonymousType<QAbstractItemModel>("QAbstractItemModel",1);
 }
diff --git a/xembed-sni-proxy/snidbus.cpp b/xembed-sni-proxy/snidbus.cpp
index d79aaad7f..12caec540 100644
--- a/xembed-sni-proxy/snidbus.cpp
+++ b/xembed-sni-proxy/snidbus.cpp
@@ -22,10 +22,10 @@ KDbusImageStruct::KDbusImageStruct(const QImage &image)
     width = image.size().width();
     height = image.size().height();
     if (image.format() == QImage::Format_ARGB32) {
-        data = QByteArray((char *)image.bits(), image.byteCount());
+        data = QByteArray((char *)image.bits(), image.sizeInBytes());
     } else {
         QImage image32 = image.convertToFormat(QImage::Format_ARGB32);
-        data = QByteArray((char *)image32.bits(), image32.byteCount());
+        data = QByteArray((char *)image32.bits(), image32.sizeInBytes());
     }
 
     // swap to network byte order if we are little endian