diff --git a/CMakeLists.txt b/CMakeLists.txt
index a29bf20..3e415d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,15 +4,18 @@ set(PROJECT_NAME cutefish-dock)
 project(${PROJECT_NAME})
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/compat")
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt5 CONFIG REQUIRED Widgets DBus X11Extras Concurrent LinguistTools QuickControls2)
+find_package(Qt6 CONFIG REQUIRED Widgets DBus Concurrent LinguistTools QuickControls2)
 
-find_package(KF5WindowSystem REQUIRED)
+find_package(KF6WindowSystem REQUIRED)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(XCB REQUIRED IMPORTED_TARGET xcb)
 
 set(SRCS
     src/applicationitem.h
@@ -36,25 +39,25 @@ set(RESOURCES
     resources.qrc
 )
 
-qt5_add_dbus_adaptor(DBUS_SOURCES
+qt6_add_dbus_adaptor(DBUS_SOURCES
                      src/com.cutefish.Dock.xml
                      src/mainwindow.h MainWindow)
 set_source_files_properties(${DBUS_SOURCES} PROPERTIES SKIP_AUTOGEN ON)
 
 add_executable(${PROJECT_NAME} ${SRCS} ${DBUS_SOURCES} ${RESOURCES})
 target_link_libraries(${PROJECT_NAME} PRIVATE
-        Qt5::Core
-        Qt5::Widgets
-        Qt5::Quick
-        Qt5::QuickControls2
-        Qt5::X11Extras
-        Qt5::Concurrent
-        Qt5::DBus
-        KF5::WindowSystem
+        Qt6::Core
+        Qt6::Widgets
+        Qt6::Quick
+        Qt6::QuickControls2
+        Qt6::Concurrent
+        Qt6::DBus
+        KF6::WindowSystem
+        PkgConfig::XCB
 )
 
 file(GLOB TS_FILES translations/*.ts)
-qt5_add_translation(QM_FILES ${TS_FILES})
+qt6_add_translation(QM_FILES ${TS_FILES})
 add_custom_target(translations DEPENDS ${QM_FILES} SOURCES ${TS_FILES})
 add_dependencies(${PROJECT_NAME} translations)
 
diff --git a/compat/QX11Info b/compat/QX11Info
new file mode 100644
index 0000000..43e1989
--- /dev/null
+++ b/compat/QX11Info
@@ -0,0 +1,47 @@
+/* Qt 6 compatibility layer for the legacy QX11Info API. */
+#ifndef CUTEFISH_QX11INFO_COMPAT
+#define CUTEFISH_QX11INFO_COMPAT
+
+#include <QGuiApplication>
+#include <QtGui/qguiapplication_platform.h>
+#include <xcb/xcb.h>
+
+class QX11Info
+{
+public:
+    static bool isPlatformX11()
+    {
+        return nativeInterface() != nullptr;
+    }
+
+    static xcb_connection_t *connection()
+    {
+        const auto native = nativeInterface();
+        return native ? native->connection() : nullptr;
+    }
+
+    static Display *display()
+    {
+        const auto native = nativeInterface();
+        return native ? native->display() : nullptr;
+    }
+
+    static xcb_window_t appRootWindow()
+    {
+        xcb_connection_t *c = connection();
+        if (!c)
+            return XCB_WINDOW_NONE;
+
+        const xcb_setup_t *setup = xcb_get_setup(c);
+        const xcb_screen_iterator_t iterator = xcb_setup_roots_iterator(setup);
+        return iterator.data ? iterator.data->root : XCB_WINDOW_NONE;
+    }
+
+private:
+    static QNativeInterface::QX11Application *nativeInterface()
+    {
+        return qGuiApp ? qGuiApp->nativeInterface<QNativeInterface::QX11Application>() : nullptr;
+    }
+};
+
+#endif
diff --git a/qml/DockItem.qml b/qml/DockItem.qml
index bb292b2..33e513f 100644
--- a/qml/DockItem.qml
+++ b/qml/DockItem.qml
@@ -19,7 +19,7 @@
 
 import QtQuick 2.12
 import QtQuick.Controls 2.12
-import QtGraphicalEffects 1.0
+import Qt5Compat.GraphicalEffects
 import Cutefish.Dock 1.0
 import FishUI 1.0 as FishUI
 
diff --git a/qml/main.qml b/qml/main.qml
index 1229879..488ece7 100644
--- a/qml/main.qml
+++ b/qml/main.qml
@@ -20,7 +20,7 @@
 import QtQuick 2.12
 import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.12
-import QtGraphicalEffects 1.0
+import Qt5Compat.GraphicalEffects
 
 import Cutefish.Dock 1.0
 import FishUI 1.0 as FishUI
diff --git a/src/activity.cpp b/src/activity.cpp
index b7e3a13..0c59d3c 100644
--- a/src/activity.cpp
+++ b/src/activity.cpp
@@ -21,7 +21,8 @@
 #include "docksettings.h"
 
 #include <NETWM>
-#include <KWindowSystem>
+#include <KX11Extras>
+#include <KWindowInfo>
 
 static Activity *SELF = nullptr;
 
@@ -39,9 +40,9 @@ Activity::Activity(QObject *parent)
 {
     onActiveWindowChanged();
 
-    connect(KWindowSystem::self(), &KWindowSystem::activeWindowChanged, this, &Activity::onActiveWindowChanged);
-    connect(KWindowSystem::self(), static_cast<void (KWindowSystem::*)(WId)>(&KWindowSystem::windowChanged),
-            this, &Activity::onActiveWindowChanged);
+    connect(KX11Extras::self(), &KX11Extras::activeWindowChanged, this, &Activity::onActiveWindowChanged);
+    connect(KX11Extras::self(), &KX11Extras::windowChanged, this,
+            [this](WId, NET::Properties, NET::Properties2) { onActiveWindowChanged(); });
 }
 
 bool Activity::existsWindowMaximized() const
@@ -56,7 +57,7 @@ bool Activity::launchPad() const
 #include <QDebug>
 void Activity::onActiveWindowChanged()
 {
-    KWindowInfo info(KWindowSystem::activeWindow(),
+    KWindowInfo info(KX11Extras::activeWindow(),
                      NET::WMState | NET::WMVisibleName,
                      NET::WM2WindowClass);
 
@@ -65,7 +66,7 @@ void Activity::onActiveWindowChanged()
     if (DockSettings::self()->visibility() == DockSettings::IntellHide) {
         bool existsWindowMaximized = false;
 
-        for (WId wid : KWindowSystem::windows()) {
+        for (WId wid : KX11Extras::windows()) {
             KWindowInfo i(wid, NET::WMState, NET::WM2WindowClass);
 
             if (i.isMinimized() || i.hasState(NET::SkipTaskbar))
diff --git a/src/fakewindow.cpp b/src/fakewindow.cpp
index 2a6ec16..4463b35 100644
--- a/src/fakewindow.cpp
+++ b/src/fakewindow.cpp
@@ -28,7 +28,7 @@
 #include <QScreen>
 #include <QTimer>
 
-#include <KWindowSystem>
+#include <KX11Extras>
 
 // X11
 #include <NETWM>
@@ -86,7 +86,7 @@ bool FakeWindow::event(QEvent *e)
             m_delayedMouseTimer.start();
         }
     } else if (e->type() == QEvent::Show) {
-        KWindowSystem::setState(winId(), NET::SkipTaskbar | NET::SkipPager | NET::SkipSwitcher);
+        KX11Extras::setState(winId(), NET::SkipTaskbar | NET::SkipPager | NET::SkipSwitcher);
     }
 
     return QQuickView::event(e);
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index fe14b89..63587d6 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -31,7 +31,7 @@
 #include <QMetaEnum>
 
 #include <NETWM>
-#include <KWindowSystem>
+#include <KX11Extras>
 #include <KWindowEffects>
 
 MainWindow::MainWindow(QQuickView *parent)
@@ -53,8 +53,8 @@ MainWindow::MainWindow(QQuickView *parent)
     setColor(Qt::transparent);
 
     setFlags(Qt::FramelessWindowHint | Qt::WindowDoesNotAcceptFocus);
-    // KWindowSystem::setOnDesktop(winId(), NET::OnAllDesktops);
-    KWindowSystem::setType(winId(), NET::Dock);
+    // KX11Extras::setOnDesktop(winId(), NET::OnAllDesktops);
+    KX11Extras::setType(winId(), NET::Dock);
 
     engine()->rootContext()->setContextProperty("appModel", m_appModel);
     engine()->rootContext()->setContextProperty("process", new ProcessProvider);
@@ -286,7 +286,7 @@ void MainWindow::initSlideWindow()
     else if (m_settings->direction() == DockSettings::Bottom)
         location = KWindowEffects::BottomEdge;
 
-    KWindowEffects::slideWindow(winId(), location);
+    KWindowEffects::slideWindow(this, location);
 }
 
 void MainWindow::updateViewStruts()
diff --git a/src/systemappmonitor.cpp b/src/systemappmonitor.cpp
index 535e4dc..dfe9a48 100644
--- a/src/systemappmonitor.cpp
+++ b/src/systemappmonitor.cpp
@@ -110,7 +110,6 @@ void SystemAppMonitor::addApplication(const QString &filePath)
         return;
 
     QSettings desktop(filePath, QSettings::IniFormat);
-    desktop.setIniCodec("UTF-8");
     desktop.beginGroup("Desktop Entry");
 
     if (desktop.value("Terminal").toBool())
diff --git a/src/utils.cpp b/src/utils.cpp
index 1b7e2cf..dd0f2db 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -27,7 +27,7 @@
 #include <QSettings>
 #include <QDebug>
 
-#include <KWindowSystem>
+#include <KX11Extras>
 
 static Utils *INSTANCE = nullptr;
 
diff --git a/src/xwindowinterface.cpp b/src/xwindowinterface.cpp
index c2e5773..b3c04db 100644
--- a/src/xwindowinterface.cpp
+++ b/src/xwindowinterface.cpp
@@ -27,7 +27,7 @@
 #include <QScreen>
 
 #include <KWindowEffects>
-#include <KWindowSystem>
+#include <KX11Extras>
 #include <KWindowInfo>
 
 // X11
@@ -46,24 +46,24 @@ XWindowInterface *XWindowInterface::instance()
 XWindowInterface::XWindowInterface(QObject *parent)
     : QObject(parent)
 {
-    connect(KWindowSystem::self(), &KWindowSystem::windowAdded, this, &XWindowInterface::onWindowadded);
-    connect(KWindowSystem::self(), &KWindowSystem::windowRemoved, this, &XWindowInterface::windowRemoved);
-    connect(KWindowSystem::self(), &KWindowSystem::activeWindowChanged, this, &XWindowInterface::activeChanged);
+    connect(KX11Extras::self(), &KX11Extras::windowAdded, this, &XWindowInterface::onWindowadded);
+    connect(KX11Extras::self(), &KX11Extras::windowRemoved, this, &XWindowInterface::windowRemoved);
+    connect(KX11Extras::self(), &KX11Extras::activeWindowChanged, this, &XWindowInterface::activeChanged);
 }
 
 void XWindowInterface::enableBlurBehind(QWindow *view, bool enable, const QRegion &region)
 {
-    KWindowEffects::enableBlurBehind(view->winId(), enable, region);
+    KWindowEffects::enableBlurBehind(view, enable, region);
 }
 
 WId XWindowInterface::activeWindow()
 {
-    return KWindowSystem::activeWindow();
+    return KX11Extras::activeWindow();
 }
 
 void XWindowInterface::minimizeWindow(WId win)
 {
-    KWindowSystem::minimizeWindow(win);
+    KX11Extras::minimizeWindow(win);
 }
 
 void XWindowInterface::closeWindow(WId id)
@@ -74,7 +74,7 @@ void XWindowInterface::closeWindow(WId id)
 
 void XWindowInterface::forceActiveWindow(WId win)
 {
-    KWindowSystem::forceActiveWindow(win);
+    KX11Extras::forceActiveWindow(win);
 }
 
 QMap<QString, QVariant> XWindowInterface::requestInfo(quint64 wid)
@@ -94,7 +94,7 @@ QMap<QString, QVariant> XWindowInterface::requestInfo(quint64 wid)
     const QString winClass = QString(winfo.windowClassClass());
 
     result.insert("iconName", winClass.toLower());
-    result.insert("active", wid == KWindowSystem::activeWindow());
+    result.insert("active", wid == KX11Extras::activeWindow());
     result.insert("visibleName", winfo.visibleName());
     result.insert("id", winClass);
 
@@ -179,7 +179,7 @@ void XWindowInterface::setViewStruts(QWindow *view, DockSettings::Direction dire
         break;
     }
 
-    KWindowSystem::setExtendedStrut(view->winId(),
+    KX11Extras::setExtendedStrut(view->winId(),
                                     strut.left_width,   strut.left_start,   strut.left_end,
                                     strut.right_width,  strut.right_start,  strut.right_end,
                                     strut.top_width,    strut.top_start,    strut.top_end,
@@ -189,12 +189,12 @@ void XWindowInterface::setViewStruts(QWindow *view, DockSettings::Direction dire
 
 void XWindowInterface::clearViewStruts(QWindow *view)
 {
-    KWindowSystem::setExtendedStrut(view->winId(), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
+    KX11Extras::setExtendedStrut(view->winId(), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
 }
 
 void XWindowInterface::startInitWindows()
 {
-    for (auto wid : KWindowSystem::self()->windows()) {
+    for (auto wid : KX11Extras::self()->windows()) {
         onWindowadded(wid);
     }
 }