diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04bf43f668c135b61c3ad970d60ed0ac6865e7e3..5e9c08cfd85e3e02b1abd3aa0581bb5377974a85 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@ set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} "${CMAKE_CURRENT_
 
 include(KDEInstallDirs)
 include(KDECMakeSettings)
-include(KDECompilerSettings NO_POLICY_SCOPE)
+include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 
 include(FeatureSummary)
 
@@ -70,8 +70,6 @@ find_package(KF5 ${KF5_MIN_VERSION} REQUIRED
 )
 
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0)
-add_definitions(-DQT_USE_FAST_OPERATOR_PLUS)
-remove_definitions(-DQT_NO_CAST_FROM_ASCII -DQT_STRICT_ITERATORS -DQT_NO_CAST_FROM_BYTEARRAY)
 
 add_subdirectory(data)
 add_subdirectory(src)
diff --git a/src/appchooserdialog.cpp b/src/appchooserdialog.cpp
index e0af8c431a6dde3bee36b725ab07b0bdd989a15f..7d411e44c941e77089c717189e5db347f24b55d8 100644
--- a/src/appchooserdialog.cpp
+++ b/src/appchooserdialog.cpp
@@ -51,7 +51,7 @@ AppChooserDialog::AppChooserDialog(const QStringList &choices, const QString &de
     label->setOpenExternalLinks(false);
 
     connect(label, &QLabel::linkActivated, this, [] () {
-        KProcess::startDetached("plasma-discover");
+        KProcess::startDetached(QStringLiteral("plasma-discover"));
     });
 
     vboxLayout->addWidget(label);
diff --git a/src/filechooser.cpp b/src/filechooser.cpp
index 1685163e46bf8d18f8382a271cc41904f49fbefe..a2167eaa3165cad5c869b1d5d2db26f25a17414b 100644
--- a/src/filechooser.cpp
+++ b/src/filechooser.cpp
@@ -29,10 +29,10 @@
 Q_LOGGING_CATEGORY(XdgDesktopPortalKdeFileChooser, "xdp-kde-file-chooser")
 
 // Keep in sync with qflatpakfiledialog from flatpak-platform-plugin
-Q_DECLARE_METATYPE(FileChooserPortal::Filter);
-Q_DECLARE_METATYPE(FileChooserPortal::Filters);
-Q_DECLARE_METATYPE(FileChooserPortal::FilterList);
-Q_DECLARE_METATYPE(FileChooserPortal::FilterListList);
+Q_DECLARE_METATYPE(FileChooserPortal::Filter)
+Q_DECLARE_METATYPE(FileChooserPortal::Filters)
+Q_DECLARE_METATYPE(FileChooserPortal::FilterList)
+Q_DECLARE_METATYPE(FileChooserPortal::FilterListList)
 
 QDBusArgument &operator << (QDBusArgument &arg, const FileChooserPortal::Filter &filter)
 {
@@ -147,7 +147,7 @@ uint FileChooserPortal::OpenFile(const QDBusObjectPath &handle,
             }
 
             if (!filterStrings.isEmpty()) {
-                nameFilters << QString("%1 (%2)").arg(filterList.userVisibleName).arg(filterStrings.join(QLatin1String(" ")));
+                nameFilters << QStringLiteral("%1 (%2)").arg(filterList.userVisibleName).arg(filterStrings.join(QLatin1String(" ")));
             }
         }
     }
@@ -219,11 +219,11 @@ uint FileChooserPortal::SaveFile(const QDBusObjectPath &handle,
     }
 
     if (options.contains(QLatin1String("current_folder"))) {
-        currentFolder = options.value(QLatin1String("current_folder")).toByteArray();
+        currentFolder = QString::fromUtf8(options.value(QLatin1String("current_folder")).toByteArray());
     }
 
     if (options.contains(QLatin1String("current_file"))) {
-        currentFile = options.value(QLatin1String("current_file")).toByteArray();
+        currentFile = QString::fromUtf8(options.value(QLatin1String("current_file")).toByteArray());
     }
 
     if (options.contains(QLatin1String("filters"))) {
@@ -239,7 +239,7 @@ uint FileChooserPortal::SaveFile(const QDBusObjectPath &handle,
             }
 
             if (!filterStrings.isEmpty()) {
-                nameFilters << QString("%1 (%2)").arg(filterList.userVisibleName).arg(filterStrings.join(QLatin1String(" ")));
+                nameFilters << QStringLiteral("%1 (%2)").arg(filterList.userVisibleName).arg(filterStrings.join(QLatin1String(" ")));
             }
         }
     }
diff --git a/src/notification.cpp b/src/notification.cpp
index 046008e05dd1148f0f20bd5ef745eb153670e682..08c88fbc88186b444ce3b5d9ca2403b6858b9e65 100644
--- a/src/notification.cpp
+++ b/src/notification.cpp
@@ -88,7 +88,7 @@ void NotificationPortal::AddNotification(const QString &app_id,
     connect(notify, &KNotification::closed, this, &NotificationPortal::notificationClosed);
     notify->sendEvent();
 
-    m_notifications.insert(QString("%1:%2").arg(app_id, id), notify);
+    m_notifications.insert(QStringLiteral("%1:%2").arg(app_id, id), notify);
 }
 
 void NotificationPortal::notificationActivated(uint action)
@@ -121,7 +121,7 @@ void NotificationPortal::RemoveNotification(const QString &app_id,
     qCDebug(XdgDesktopPortalKdeNotification) << "    app_id: " << app_id;
     qCDebug(XdgDesktopPortalKdeNotification) << "    id: " << id;
 
-    KNotification *notify = m_notifications.take(QString("%1:%2").arg(app_id, id));
+    KNotification *notify = m_notifications.take(QStringLiteral("%1:%2").arg(app_id, id));
     if (notify) {
         notify->close();
         notify->deleteLater();
@@ -139,6 +139,6 @@ void NotificationPortal::notificationClosed()
     const QString appId = notify->property("app_id").toString();
     const QString id = notify->property("id").toString();
 
-    m_notifications.remove(QString("%1:%2").arg(appId, id));
+    m_notifications.remove(QStringLiteral("%1:%2").arg(appId, id));
     notify->deleteLater();
 }
diff --git a/src/print.cpp b/src/print.cpp
index 2fca78ff69c2693758b8af2db588183f32f9d113..f9f657b19f997fa5514ff98629cd2bf28ca94e88 100644
--- a/src/print.cpp
+++ b/src/print.cpp
@@ -633,7 +633,7 @@ uint PrintPortal::PreparePrint(const QDBusObjectPath &handle,
             resultingSettings.insert(QLatin1String("print-pages"), QLatin1String("current"));
         } else if (printer->printRange() == QPrinter::PageRange) {
             resultingSettings.insert(QLatin1String("print-pages"), QLatin1String("ranges"));
-            resultingSettings.insert(QLatin1String("page-ranges"), QString("%1-%2").arg(printer->fromPage()).arg(printer->toPage()));
+            resultingSettings.insert(QLatin1String("page-ranges"), QStringLiteral("%1-%2").arg(printer->fromPage()).arg(printer->toPage()));
         }
         // Set cups specific properties
         const QStringList cupsOptions = printer->printEngine()->property(PPK_CupsOptions).toStringList();
diff --git a/src/screenshot.cpp b/src/screenshot.cpp
index 782e7bb781dc4fa7b0e0420963ef9f0dc67b5982..5f52d1ab4d3980be881d0e2369f7532a2d46b93b 100644
--- a/src/screenshot.cpp
+++ b/src/screenshot.cpp
@@ -34,7 +34,7 @@
 Q_LOGGING_CATEGORY(XdgDesktopPortalKdeScreenshot, "xdp-kde-screenshot")
 
 // Keep in sync with qflatpakcolordialog from Qt flatpak platform theme
-Q_DECLARE_METATYPE(ScreenshotPortal::ColorRGB);
+Q_DECLARE_METATYPE(ScreenshotPortal::ColorRGB)
 
 QDBusArgument &operator <<(QDBusArgument &arg, const ScreenshotPortal::ColorRGB &color)
 {
diff --git a/src/screenshotdialog.cpp b/src/screenshotdialog.cpp
index 73d2df1ea7a805dfba86385038d1e0fc6f3475cf..c878d8cca61eedb814c1dc7ad4b3953fb011cbbf 100644
--- a/src/screenshotdialog.cpp
+++ b/src/screenshotdialog.cpp
@@ -72,7 +72,7 @@ static QImage readImage(int pipeFd)
     QImage image;
     ds >> image;
     return image;
-};
+}
 
 ScreenshotDialog::ScreenshotDialog(QDialog *parent, Qt::WindowFlags flags)
     : QDialog(parent, flags)